- acceleration
- Graph of acceleration of the straight driven element or the rotation angle acceleration of a rocker and the cam plate angle of rotation.
- ACIS
- Alan, Charles, Ian Systems. An open-architecture, object-oriented software program providing a geometric engine for application developers. ACIS supports methods for creating and editing a broad range of 3D geometric objects including splines, surfaces, and solids.
- action pane
- The area in the Dimension Formatter dialog box where your change to a control is dynamically reflected on your drawing.
- administrator configuration file
- A file that contains the system settings. The path to this file is contained in the AdminCfgPath entry of the windows registry subkey \HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\[AutoCAD Version Number]\[PRODUCT_ID]\Mechanical\SYSTEM.
Where
* AutoCAD Version Number is the version ID for AutoCAD. The AutoCAD version ID for AutoCAD 2008 is R17.1
* PRODUCT_ID is a product- & language-dependent number and will typically look like ACAD-4003:409.
The registry subkey will typically look like:
\HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R17.1\ ACAD-4003:409\Mechanical\SYSTEM.
- alloy steel
- An alloy steel contains elements other than carbon which have been added to obtain definite mechanical or physical properties, such as higher strength at elevated temperatures, toughness, etc.
- annotation
- A group of AutoCAD 2D objects, such as text or geometry that is attached to a Mechanical Desktop drawing to describe a design. Examples are surface finish symbols, callout balloons, and BOMs (bills of material).
- annotation view
- A folder that contains one or more views of a single component dedicated to annotating and detailing parts and assemblies. Annotation views are used to instance component views without incrementing the component quantity in the bill of materials (BOM).
- attach
- The act of connecting a reference file to the current assembly file. The attachment remains with the current file after the file is saved.
- auto detailing
- A function where component detail drawings can be inserted automatically into the drawing under a specific scale, with a border and a title block. Layer groups or selected elements can be set as components for the auto detailing.
- automatic dimension
- A function that offers various options to dimension a 2D contour automatically. You determine the point marking the origin of the dimension. The function searches for the edges of the work piece and dimensions according to the selected dimension type.
- background
- A contour that is covered by another contour or by objects that are lying behind another contour, in the 3D sense. A background may be a foreground for an additional contour.
- balloon
- Circular annotation tag that ties components in an assembly into a bill of materials.
- base dimension
- The first dimension selected for joining, inserting, and aligning dimensions.
- base layer
- A layer made up of working layers and standard parts layers. Base layers are repeated in every layer group.
- base standard
- Predefined drafting standard that conforms to International Drafting Standards ANSI, ISO, DIN, BSI, GB, CSN, and JIS.
- baseline dimensioning
- A dimension that is aligned to extension lines and read from the bottom or right side of the drawing.
- basic size
- The basic size is that size from which the limits of size are derived by the application of allowances and tolerances.
- bearing calculation
- Calculates limiting value, dynamic and static load rating, dynamic and static equivalent load, and fatigue life in revolutions and hours.
- Belleville spring washer
- Washer-type spring that can sustain relatively large loads with small deflections. The loads and deflections can be increased by stacking the springs.
- bill of material (BOM)
- A dynamic database containing a list of parts. Used to generate part lists that contain associated attributes such as part number, manufacturer, and quantity.
- binding head
- The binding head has a rounded top surface, slightly tapered side surface and a flat bearing surface, a portion of which is sometimes undercut adjacent to the shank.
- body
- The body of a threaded fastener is the unthreaded portion of the shank.
- body diameter
-
The body diameter is the diameter of the body of a threaded fastener.
- BOM attribute
- An entity that contains attributes by default (the attribute is invisible) that can add information to and describe details of a part in the drawing. The values of these attributes are transformed into the parts list attributes when converting BOM attributes and creating a parts list.
- border BOM
- A BOM database that contains a list of all the parts within the confines of a drawing border. For a border BOM to be created, the drawing must contain one or more drawing borders.
- breakout line
- Shows a partial area of a broken view.
- button head
- A button head as applied to threaded fasteners has a low rounded top surface with a large flat bearing surface.
- calculation object
- An object in model space that is a result of an engineering calculation. Examples include cams, deflection lines, moment lines, moment of inertia, screw calculations and shaft calculations.
- cam
- Types of gears for obtaining unusual and irregular motions that would be difficult to produce otherwise.
- carbon steel
- Carbon steel is a steel that does not contain any substantial amounts of alloying materials other than carbon.
- centerline
- Line in the center of a symmetrical object. When you create centerlines, you specify the starting and endpoints.
- chain dimensioning
- A dimensioning that always refers to the end of the last dimension.
- chamfer
- A placed feature that bevels a part edge and is defined by its placement, size, and angle.
- chamfer point
- A chamfer point is a truncated cone point, the end of which is approximately flat and perpendicular to the fastener axis. These points on threaded fasteners generally have point included angles of 45 to 90 degrees and a point diameter equal to or slightly less than the minor diameter of the thread. This point is intended to facilitate entry of fasteners into holes at assembly.
- class of thread.
- An alphanumerical designation to indicate the standard grade of tolerance and allowance specified for a thread.
- clearance
- A mating where the parts fit together loosely.
- clearance fit
- A fit between mating assembled parts that provides a clearance at their maximum material condition.
- clearance flank
- The flank that does not take the externally applied axial load in an assembly.
- closed end
- The end of the rivet, as manufactured, is solid and remains closed on the blind side after setting.
- coating
- Coating is the application of some material such as a metal, organic compound, etc. to the surface of a fastener.
- collinear
- The relative position of any number of lines or linear edges that have the same slope and are coincident with one another.
- component
- An element of mechanical structure that represents a part or subassembly. In 2D drawings, a part or assembly is represented by one or more views. Hence a component can be considered to be a container for component views, and the views of the part or assembly are collected under the component node in the mechanical browser.
- component definition
- A non-graphical description of a mechanical structure component that AutoCAD Mechanical toolset saves in the data area of a drawing, similar to how it saves a block definition.
- component view
- A folder that contains the geometry representing a view of a part or subassembly. On the mechanical browser, a component view is always a child of a component node.
- compression spring
- A spring type that can be compressed and can absorb pressure forces.
- concentric
- The relative position of any number of arcs or circles that shares the same center point or projected center point.
- cone
- A solid object with a round base and a point at the top.
- cone head
- A cone head is a high conical head with a small, flat, truncated top and a flat bearing surface.
- cone point
- A cone point is a sharp conical point designed to perform perforating or aligning functions at assembly.
- construction geometry
- Any line or arc created with construction lines. Using construction geometry in 2D drawings helps you to define your contour shape.
- construction line (C-line)
- A line that is infinite in both directions or infinite starting at a point which can be inserted into the drawing area. You use C-lines to transfer important points (for example, center points of bore holes) into other views or drawing areas.
- content editor
- An editing environment to edit custom content from content libraries.
- content layers
- A special set of layers that are accessible only in the Content Editor, for the specific purpose of mapping geometry on each layer to the mechanical objects corresponding to that layer.
- contour inside
- Displays the inner contour of an object. You need to select the boundary edges on underlying layers (0, AM_0, AM_1, AM_2).
- contour layer
- A special mechanical layer that AutoCAD Mechanical toolset uses to draw object lines on. Up to four mechanical layers can be set as contour layer in the Object Property Settings dialog box. By default only the layers AM_0, AM_1, AM_2 are contour layers.
- contour outside
- Displays the outer contour of an object. You need to select the boundary edges on underlying layers (0, AM_0, AM_1, AM_2).
- contour trace
- A function that can combine a number of entities to form a closed polyline consisting of individual segments. This polyline can be copied and processed, (to calculate the dimensions for example).
- coordinate system
- The set of magnitudes (visually represented by the X, Y, and Z axes) that determines the position of points, lines, curves, and planes in part and assembly files. By default, a grid displays on the active sketch plane of the coordinate system.
- counterbore
- A blind hole of a larger diameter drilled concentric with a hole to allow bolt and screw heads to be flush or below the part surface.
- countersink
- A chamfered hole that allows bolt and screw heads to be flush or below the part surface.
- countersunk head
- A countersunk head is a circular head having a flat top surface and a conical bearing surface with head angles that vary with the rivet type.
- cross section
- Manually created 2D view which shows a cut through a part.
- current standard
- The drafting standard that currently controls how annotations and mechanical objects look and behave (appearance and behavior) during creation. The current standard is shown in the Standard box, in the AM:Standards tab of the Options dialog box.
- curve path
- Geometric shape of the cam.
- custom balloon
- A balloon having a custom shape, which has been created using a block.
- custom parts list
- A customized parts list constructed using blocks.
- custom standard
- A named user defined standard that is created via the AM:Standards tab of the Options dialog box. At the time of creation, the settings of a custom standard are identical to that of the standard it is based on. However, the elements of the standard can be customized to any value, even to values that are not permitted in the original standard the custom standard is based on.
- cut line
- Used to specify the path of a cross-section drawing view.
- cutting plane line
- Imaginary cutting line through a work piece. The arrows determine the cutting direction. Also called section line.
- cylinder axial
- Option for inserting a standard part or hole parallel to a cylinder axis.
- cylinder radial
- Option for inserting a standard part or hole radial into a cylinder.
- datum identifier
- A symbol consisting of a frame with a reference letter.
- datum target
- Used to establish a theoretical exact plane, line, or profile. All features are subject to deviation, and it may be impractical to control the tolerance of an entire surface via a datum. In order to specify practical data, relevant locations called datum targets are selected and indicated on a drawing. The datum target may be a point, a line, or an area.
- deflection line
- Deflection lines are calculated based on the predefined force direction (F) or to radial direction (s).
- deflection moment
- Deflection moment is calculated based on the predefined force direction (F) or to radial direction (s).
- detach
- Permanently removing a file as an external reference in an assembly.
- detail
- A portion of the design drawing which cannot be displayed or dimensioned clearly. The overall representation (surface texture symbols) can be enlarged.
- deviation
- A variation from an established dimension, position, standard, or value.
- die fin
- A die fin is a slight amount of excess material or flash which may be visible on the bearing surface and/or body of fasteners made by open die heading.
- digitizing
- A manual or automatic process utilizing a mechanical device to follow and electronically record the 2D shape of a line on a drawing or the 3D contour of a physical model.
- dimensional tolerance
- The width of the tolerance (upper deviation - lower deviation).
- distance snap
- a feature where dimensions snap to a fixed distance from the object being dimensioned.
- distributed force
- A force that is spread over an area.
- drawing
- A layout of drawing views in model space or layout.
- drawing border
- A standardized frame, that is used for technical drawings.
- drawing mode
- Establishes the settings for the layout so that you can create a drawing of your model. When Drawing mode is off, you are in model space.
- drawing title
- The drawing title is in the lower right corner of the drawing and provides information about your drawing.
- drawing view
- A defined, oriented view of a part or model used for manufacturing. Drawing views are placed in layout mode and have parametric relationships to each other.
- drilled
- A single-diameter hole with no counterbore or countersink.
- dynamic calculation
- Calculation required for a revolving bearing. The result is the Adjusted Rating Life. This is the life associated with 90% reliability with contemporary, commonly used material, and under conventional operating conditions. With the number of revolutions you get the life in working hours.
- dynamic dragging
- The act of determining the size of a standard part with the cursor while inserting the part into a side view. The standard part is displayed dynamically on the screen and can be dragged to the next possible size and length. The values (sizes) are taken from the Standard parts database.
- edge
- The boundary of a face.
- edge symbol
- Symbol used to describe edges of objects, which are generated using certain production processes. The object edge consists of the basic symbol, the edge dimension, and the minus or plus sign. You can also specify an upper and lower limit for the edge dimension.
- effective thread
- The effective (or useful) thread includes the complete thread, and those portions of the incomplete thread which are fully formed at the root but not at the crest, thus excluding the vanish thread.
- entity filter
- Filters entities on a defined layer.
- extension spring
- A spring type that can absorb tension forces.
- external drawing
- A drawing reference that resides in a file other than the current assembly file.
- external reference component
- An instance of a mechanical structure component, which has its definition stored in another drawing.
- external thread
- A screw thread formed on the outside of a cylindrical surface.
- externalize
- The process of converting a local component to an external reference component. The process creates a new drawing and moves the definition of the component to the new file, rendering the component an external reference component.
- family of lines
- A term referring to a set of polylines or splines that share common characteristics, for example, lines that are parallel to each other.
- FEA
- Finite Element Analysis. A calculation routine, or method. Calculates stress and deformation in a plane for plates with a given thickness, or in a cross section with individual forces, stretching loads, and fixed and/or movable supports. The FEA routine uses its own layer group for input and output.
- feature
- Any component portion of a part that can be used as basis for a datum. An individual feature may be:
- - a plane surface (in which case there is no consideration of feature size);
- - a single cylindrical or spherical surface or two plane parallel surfaces (all of which are associated with a size dimension).
- feature control frame symbol
-
Symbol that gives an accurate and concise meaning to specifying geometric characteristics and tolerances. Notes can supplement symbols where appropriate.
- feature identifier symbol
- Specifies individual features for tolerancing.
- fillet
- A curved transition from one part face or surface to another. The transition cuts off the outside edge or fills in the inside edge. The fillet can have a constant or variable radius.
- fillister head
- The fillister head has a rounded top surface, cylindrical side surface and a flat bearing surface.
- fin
- A fin, as in a Fin Neck Bolt, is a form of key under the head of a fastener which serves to keep the fastener from turning during assembly and use.
- fin neck
- A fin neck is a style of neck consisting of two or more fins under and integral with the head.
- finish
- The term finish is commonly applied to the condition of the surface of a fastener as a result of chemical or organic treatment subsequent to fabrication. The term finish is also applied to some types of fasteners to indicate the condition of the surface as a result of mechanical operations and the degree of precision.
- fit
- Range of tightness or looseness in mating parts (for example shafts or holes). Tolerances in these dimensions are expressed in standard form.
The relationship resulting from the designed difference, before assembly, between the sizes of two mating parts which are to be assembled.
Fit is the general term used to signify the range of tightness which may result from the application of a single combination of allowances and tolerances in the design of mating parts.
- fit name
- Name of the selected fit (for example H7).
- fit type
- There are three kinds of fit types: Interference, Clearance, and Transition.
- fits list
- A table of all fits within a drawing. The fits list function searches the entire drawing for fits. Once they have been gathered, you are asked where to insert this list for in your drawing.
- fixed support
- A support that is fixed to the part and cannot be moved.
- flank
- The part of a helical surface that connects the crest and the root and which is theoretically a straight line in an axial plane section.
- flank angle
- The angle formed by a flank and a perpendicular to the thread axis in an axial plane.
- flat fillister head
- The flat fillister head has a flat top surface, cylindrical side surface and a flat bearing surface.
- flat head
- The flat head has a flat top surface and a conical bearing surface with head angle of nominally 82 degrees.
- flat undercut head
- The flat undercut head is basically the same as the standard 82° flat head except it is undercut to 70 percent of the basic head height.
- folder
- An object very similar to a block that combines one or more geometrical objects and is represented in the mechanical browser by a folder icon. Folders are the most flexible element of mechanical structure and can contain geometry as well as other folders.
- folder definition
- A non-graphical description of a mechanical structure folder that AutoCAD Mechanical toolset saves in the data area of a drawing, similar to how it saves a block definition.
- foreground
- Objects which are lying in front of another contour in the 3D sense. A foreground may also be a background for an additional contour.
- free object
- An elemental geometry in model space, such as a line, arc.
The term free object is used in the context of associative hide situations, where structure entities such as component views and folders as well as free objects overlap one another. For example, a component view that contains a circle and a rectangle where one overlaps the other, results in a hide situation involving two free objects.
- galvanizing
- Galvanizing is the process of coating iron or steel with zinc - originally by using direct current and a zinc anode.
- gear
- Any several arrangements, especially of toothed wheels in a machine which allows power to be passed from one part to another so as to control the power speed or the direction of movement.
- geometric tolerance
- The general term applied to the category of tolerances used to control form, profile, orientation, location, and run out.
- ghost component
- A mechanical browser representation of a component that is in an intermediate state of restructure. Ghost components occur when one or more component views have been restructured and the remaining views are held temporarily on a ghost until they too are restructured.
- grinding
- Grinding is the process of removing material from the surface by the cutting action of a bonded abrasive wheel.
- grip
- In general, the grip of a fastener is the thickness of material or parts which the fastener is designed to secure when assembled.
- groove
- A long narrow path made in a surface (for example in a shaft).
- ground thread
- A ground thread is a thread finished on the flanks by a grinding operation.
- head
- The head of a fastener is the enlarged shape, pre-formed on one end of a headed fastener, to provide a bearing surface.
- head angle
- The head angle is the included angle of the bearing surface of the head.
- head diameter
- The head diameter is the diameter at the largest periphery of the head.
- head height
- For a flat bearing surface head, the head height is the overall distance, measured parallel to the fastener axis, from the extreme top to the bearing surface. For a conical bearing surface head, the head height is the overall distance, measured in a line parallel to the fastener axis, from the extreme top to the intersection of the bearing surface with the extended thread major diameter cylinder on a threaded fastener or with the shank on an unthreaded fastener. For flat and oval undercut heads, it is this distance measured to the intersection of the bearing surface with the undercut. For oval heads and undercut oval heads, the overall distance is referred to as total head height.
- header point
- A header point is a chamfered point normally produced during the heading operation. The screw blank is chamfered before threads are rolled. It is applied to machine screws in certain sizes and lengths.
- headless threaded fastener
- A headless threaded fastener is a fastener normally having a slot, recess or socket in one end.
- helix
- The curve formed on any cylinder by a straight line angular to the axis, and in a plane that is wrapped around the cylinder.
- helix angle
- The complement of the lead angle.
- hex flange head
- The hex flange head is a circular flange upon which a hex head is formed.
- hex head
- The hex head has a flat or indented top surface, six flat sides and a flat bearing surface.
- hexagon washer head
- The hexagon washer head is a washer head upon which a hexagon head is formed.
- hidden line
- Line that is not visible in a specified view. For example, in a front view, lines behind the front plane would not be visible.
- hide 2D
- A closed contour (with islands) that can be used to define an area. This area is used to change the representation of other objects. Usually, these objects are lying behind this area (in the 3D sense) and are partly or entirely not visible in the view.
- hide situation
- A description of how a group of overlapping objects are organized in a 3d sense. Hide situations can be created using the AM2DHIDE command or the AMSHIDE command. AMSHIDE is designed to be used in conjunction with mechanical structure and hide situations created with it are represented in the mechanical browser.
- hole
- A geometric feature with a predefined shape: drilled, counterbore, or countersink.
- hole chart
- A table with X and Y coordinates, and the radius of holes in a plate.
- hot dip galvanizing
- Hot dip galvanizing is the process of immersing the parts to be coated in a batch of molten zinc.
- incomplete lead thread
- An incomplete thread that is fully formed at the root, but not fully formed at the crest.
- incomplete runout thread
- An incomplete thread that is fully formed at the crest, but not fully formed at the root.
- incomplete thread
- A threaded profile having either crests or roots, or both crests and roots not fully formed, resulting from the intersection with the cylindrical or end surface of the work or the vanish cone. It may occur at either end of the thread.
- inspection dimension
- A dimension critical to a part, which must be inspected during the manfacturing process. An inspection dimension typically contains a label to uniquely identify the dimension, the dimension value, and the frequency the dimension should be inspected.
- instance
- An object that is inserted in a drawing and displays the data stored in a definition (block definition, component definition, view definition or folder definition). In a drawing there can be multiple instances of a single definition and is a powerful way of reusing geometry.
- interference
- A mating where the parts always grip tightly.
- internal thread
- A screw formed on the inside of a cylindrical surface.
- language converter
- Tool that dynamically translates texts, attribute values, Mtexts (multiline texts), and default values of attributes in selected blocks into other languages.
- layer definition
- A non-graphical description of a layer that AutoCAD Mechanical toolset saves in the data area of a drawing, similar to how it saves a block definition. Layer definitions are used by AutoCAD Mechanical toolset commands to create layers on demand.
- layer group
- A set of mechanical layers that contain associated or related items in a drawing. A major advantage of working with layer groups is that you can deactivate a specific layer group and hence, a complete component. The drawing and its overview are enhanced with a reduction in regeneration time.
- layout
- The tabbed environment in which you create and design paper space floating viewports to be plotted. Multiple layouts can be created for each drawing. See model space and paper space.
- leader line
- Command, for adding leader lines to existing leader lines.
- left-hand thread
- A screw thread that is screwed in or on counterclockwise. All left-hand threads are designated LH.
- length of headed fastener
- The length of a headed fastener is the distance from the intersection of the largest diameter of the head with the bearing surface to the extreme point, measured in a line parallel to the axis of the fastener.
- library
- A feature for storing parts (blocks, drawings) in a library.
- load
- Forces and moments that act on a part.
- local component
- An instance of a mechanical structure component, which has its definition stored in the same drawing as the instance.
- localize
- The process of converting an external reference component to a local component.
- lower deviation
- A negative (or the lowest) deviation from the nominal size.
- lower tolerance
- A negative tolerance.
- lubricator
- A device for lubricating parts.
- main BOM
- A dynamic database containing a list of all the parts in the drawing file. Used to generate part lists that contain associated attributes such as part number, manufacturer, and quantity.
- mass properties
- Volumetric information about a part or model that is based on the density of the material. Mass properties include the center of gravity, principle axes, moments of inertia, and mass.
- master view definition
- The master view definition (MVD) is the root node of the browser, labeled with the file name. The MVD is the topmost parent of all folders and views.
- mating
- shaft
- maximum clearance
- The maximum mating where the parts will fit together loosely.
- maximum limit of size
- Nominal size of a part plus the upper deviation. The part does not exceed this size.
- mechanical browser
- A window containing a tree that shows the hierarchical relationship of elements of mechanical structure such as components, component views, annotation views, and folders, in a drawing.
- mechanical layer definition
- A non-graphical description of a layer that AutoCAD Mechanical toolset saves in the data area of a drawing, similar to how it saves a block definition. Layer definitions are used by AutoCAD Mechanical toolset commands to create layers on demand.
- mechanical layers
- A set of special layers that have been preassigned to objects created by AutoCAD Mechanical toolset commands. No matter what the current layer is, AutoCAD Mechanical toolset created objects on these pre assigned layers. If the layer does not exist in the drawing, the layer is automatically created.
- minimum clearance
- The minimum mating where the parts will fit together loosely.
- minimum limit of size
- Nominal size of a part plus the lower deviation. The part remains under this size.
- minor clearance
- The radial distance between the crest of the internal thread and the roots of the external thread of the coaxially assembled design forms of mating threads.
- model space
- One of the two primary spaces in which AutoCAD objects reside. Typically, a geometric model is placed in a three-dimensional coordinate space called model space. A final layout of specific views and annotations of this model is placed in layout mode. See also layout and paper space.
- moment of inertia
- An important property of areas and solid bodies. Standard formulas are derived by multiplying elementary particles of area and mass by the squares of their distances from reference axes. Moments of inertia, therefore, depend on the location of reference axes.
- movable support
- Support which is not fixed.
- movement diagram
- The representation of the cam as a graph of the lift and the angle of rotation of the cam plate (straight driven element). If the driven element is a rocker, the lift corresponds to an angle of rotation of the rocker.
- movement section
- Part of the movement diagram. Some sections are defined by design. For example, the maximum lift of 15 mm is reached at an angle of 90 degrees.
- multi edit
- An option where you determine a selection set of dimensions and edit them together.
- NC
- Numerical Control. Used in the manufacturing industry to represent the control on machine tool movement through numeric data for 2.5 axis machining (two-and-a-half-axis machining).
- neck
- Neck is used to define:
- - a specialized form of a portion of the body of fasteners near the head to perform a definite function, such as preventing rotation, etc.; and
- - a reduced diameter of a portion of the shank of a fastener which is required for design or manufacturing reasons.
- nominal size
- The ideal dimensional value.
The nominal size is the designation used for the purpose of general identification.
- non-mechanical layer
- A layer that is created via the AutoCAD LAYER command.
- nut thickness
- Nut thickness is the overall distance from the top of the nut to the bearing surface, measured parallel to the axis of the nut.
- nut width
- The nut width is the distance across opposite flats of hexagon, square or twelve-point nuts.
- object prototypes
- Properties of layers and objects.
- oiled
- Oiled is the term denoting the application of a suitable corrosion retarding oil to a fastener.
- open end
- The end of the rivet, as manufactured, is open, that means, the rivet body is hollow through its full length.
- ordinate dimensioning
- In general, these ordinate dimensioning practices are compatible with the data requirements for tape or computer-controlled automatic production machines.
- oval head
- The oval head has a rounded top surface and a conical bearing surface with head angle of nominally 82 degrees.
- oval point
- An oval point is a radiused point, sometimes referred to as a Crowned End or Round Point.
- oval undercut head
- The oval undercut head is the same basic head as the standard oval head except it is shorter. The screw head is undercut to 70 percent of the basic head side height to afford a greater length of thread.
- pan head
- The pan head has a flat bearing surface and a flat top surface rounding into a cylindrical side surface. On recessed pan heads, the top surface is semi-elliptical, rounding into a cylindrical side surface.
- paper space
- One of two primary spaces in which AutoCAD objects reside. Paper space is used for creating a finished layout for printing or plotting, as opposed to doing drafting or design work. You design your paper space viewports using a layout tab. See also model space and layout.
- parallel guides
- Support that has a degree of freedom in the vertical direction.
- parametric dimensions
- A special type of dimension used in Autodesk Mechanical Desktop and Autodesk Inventor, to control the size of a geometry. When you change the dimension value, the size of the associated geometry changes to reflect the new value of the dimension. AutoCAD Mechanical toolset can display parametric dimensions created in Autodesk Inventor, when you open an Inventor part or assembly file using the Inventor link feature.
- parent view
- A drawing view on which other views are based. For example, the base view is the parent view for an isometric or orthographic view.
- part layer
- A layer where the standard parts are put. All standard parts layers have the suffix AM_*N.
- part reference
- Part information for a bill of material, which is attached to the part in the drawing.
- partition
- Distance in mm or inches between centers of adjacent joint members. Other dimensions are proportional to the pitch. Also known as pitch.
- parts list
- A dynamic list of parts and associated attributes generated from a bill of material database. The parts list automatically reflects additions and subtractions of parts from an assembly.
- pitch
- The measured distance parallel to the axis of a thread, from one point on the path to the corresponding point on the adjacent revolution.
The pitch of a thread having uniform spacing is the distance, measured parallel to its axis, between corresponding points on adjacent thread forms in the same axial plane and on the same side of the axis. Pitch is equal to the lead divided by the number of thread starts.
- pitch diameter
- The diameter of the pitch circle that passes through the centers of the link pins as the chain is wrapped on the sprocket.
On a straight thread, the pitch diameter is the diameter of the pitch cylinder.
- pitch line
- A generator of the cylinder specified in the definitions of pitch cylinder.
- point
- The point of a fastener is the configuration of the end of the shank of a headed fastener or of each end of a headless fastener.
- point angle
- The point angle is the included angle of the point.
- point diameter
- The point diameter is the diameter of the point measured at the extreme end of the fastener. It may sometimes be designated as Chamfer Diameter or Pilot Diameter on respective point types.
- point force
- A force which is concentrated on a point.
- point length
- The point length is the length of the pointed portion of the fastener, measured parallel to the axis of the fastener from the extreme end. It may sometimes be designated as Chamfer Length or Pilot Length on respective point types.
- point radius
- The point radius is the spherical radius on an oval or spherical point.
- power command
- Summary term for Power Copy, Power Recall, Power Edit, Power Dimensioning, Power Erase and Power View.
- Power Copy
- A command that copies a drawing object to another position in the drawing. Power Copy produces an identical copy of the copied object.
- Power Dimensioning
- A command useful for generating linear, radial, and diameter dimensions while minimizing the number of the individual actions for generating a dimension. Power Dimensioning automatically selects the type of the linear dimension (horizontal, vertical, aligned) based on the selected point.
- Power Edit
- A single edit command for all objects in your drawing.
- Power Erase
- Command for deleting. Use Power Erase when you delete part reference numbers or dimensions that were created with Power Dimensioning.
- Power Object
- An object or a group of drawing objects that contain additional information.
- Power Recall
- A command that lets you click an existing drawing object and places you in the correct command for creating that object.
- Power View
- A tool where you can quickly and easily create a standard part top view from a side view.
- preselection
- Option that allows you to set preferences for parts based on your company's standards. For example only cylinder head screws greater than M8 are used in your company. In this case, you delete the company preference for cylinder head screws smaller than M8.
- radius
- Distance from the center point of an arc or circle to a point on its circumference.
- radius reflection line
- Thin line that represents the radius in the side or top view.
- recess depth
- The recess depth is the distance measured parallel to the fastener axis from the intersection of the head surface with the maximum diameter of the recess to the bottom of the recess.
- recess diameter
- The recess diameter is the diameter measured in a plane perpendicular to the axis of the fastener over the intersection of the outermost extremities of the recess with the head surface.
- recess width
- The recess width is the distance measured in a plane perpendicular to the axis of the fastener across the intersection of the sides or wings of the recess with the head surface.
- recessed head
- A recessed head is a head having a specially formed indentation or recess centered in its top surface. Three common forms of recessed heads are the Cross Recess, Clutch Recess and Square Recess.
- reference dimension
- A dimension that is not critical to a part and hence need not be inspected during manufacturing.
- representation
- Standard parts representation in a drawing in normal, simplified, and symbolic mode.
- resolution (cam plate)
- Controls the precision of curves. A low value increases computing time. Use a higher value for initial design.
- revision list
- A line block to be inserted in the drawing after each change in the drawing. The list can contain the date of change, the name of the person responsible for the changes, and a description of the changes.
- ribbed neck
- A ribbed neck is style of neck consisting of longitudinal ribs around the shank adjacent to the underside of the head.
- right-hand thread
- A screw thread that is screwed in or on clockwise.
- roller chain
- A roller chain is made up of two kinds of links: roller links and pin links alternately and evenly spaced throughout the length of the chain.
- runout
- As applied to screw threads, unless otherwise specified, this term refers to circular runout of major or minor cylinders with respect to the pitch cylinder.
- scale area
- Defines a particular scale area (corresponds to zoom viewport). The respective scales can be viewed before zooming.
- scale monitor
- Function where you can control the scale for each viewport.
- screw template
- Enables you to include frequently used screw connections which were saved before.
- screw thread
- A continuous and projecting helical ridge usually of uniform section on a cylindrical surface.
- script
- Scripts contain a set of AutoCAD commands which are executed sequentially with a single SCRIPT command. Script files are saved in a text format and stored in an external file with the extension SCR.
- script generator
- Feature that enables you to work on a select set of drawings. In the script, you can combine as many LISP routines as required.
- section line
- Line through a 2D view which defines the cross section.
- shaft break
- Interruption of a shaft. A shaft can be interrupted at a point, and the shaft break symbols are inserted in a suitable size.
- shaft generator
- Tool to draw rotationally symmetric parts. A shaft is usually created from left to right using different sections. These sections are positioned automatically one after the other. Additionally, any shaft section can be inserted, deleted, or edited.
- shoulder
- A shoulder is an enlarged portion of the body of a threaded fastener, or shank of an unthreaded fastener.
- simple weld
- Draws arc and V welds in plain views and cross-sections. Ellipses, circles, arcs, lines and polylines can be provided with a weld.
- slope
- A measure of an angle from a level direction.
- slot depth
- The slot depth on a headed fastener is the distance measured parallel to the axis of the fastener from the highest part of the head to the intersection of the bottom of the slot with the head or bearing surface. The slot depth on a nut or headless fastener is the distance measured parallel to the fastener axis from the top surface to the extreme bottom of the slot.
- slot width
- The slot width is the distance measured in a plane perpendicular to the axis of the fastener over the intersection of the sides of the slot with the head surface of a headed fastener or top surface of a nut.
- slotted head
- A slotted head is a head having a slot centered across its top surface.
- socket depth
- The socket depth is the distance measured parallel to the fastener axis from the intersection of the socket with the head surface to the extreme end of the socket. In socket head screws, the effective socket depth is most often specified as Key Engagement which is the distance from the intersection of the socket with the head surface to that depth to which the key or wrench will penetrate, measured in a like manner.
- socket diameter
- The socket diameter is the diameter measured in a plane perpendicular to the axis of the fastener over the intersection of the outermost extremities of the socket with the head surface.
- socket head
- The socket head has a flat chamfered top surface with smooth or knurled cylindrical side surface and a flat bearing surface. A hexagon socket is usually formed in the center of the top surface.
- socket width
- The socket width is the distance measured in a plane perpendicular to the axis of the fastener over the intersection of opposite sides of the socket with the head surface.
- sprocket
- A toothed wheel that transfers the power from the chain to the shaft or the other way round.
- square head
- The square head has a flat top surface, four flat sides and a flat bearing surface. Square heads on set screws have a rounded top surface and may have an underhead construction tapered or radiused directly into the body.
- square neck
- A square neck is a style of neck consisting of a square shoulder formed integral with the underside of the head.
- stainless steel
- Stainless steel is a corrosion resistant type of alloy steel which contains a minimum of 12 percent chromium.
- static calculation
- Required for bearing-suffering loads in standstill or swinging movement, or for small numbers of revolutions (n < 20 1/min).
- step width
- Specifies the distance between the points used for the NC records.
- stress
- Force or pressure on a part. Stress is force per area.
- subview
- A part of an annotation view that represents the component views of the component for which the annotation view was created for. In the mechanical browser, subviews are nested below the annotation view.
- surface indication leader
- An additional leader (arrowhead, leader and reference line) added to feature control frame and datum identifier symbols, for the prupose of pointing to surfaces\faces rather than edges.
- surface texture list
- A summary list of all surface texture symbols in a drawing.
- surface texture symbol
- Symbol that specifies surface texture finish. The symbols conform, in terms of their geometry and annotations (which includes text and other symbols), to international drafting standards.
- symbols and designations
- Symbols associated with screw threads are of two kinds:
- - letter symbols for designating dimensions of screw threads and threaded products, and
- - abbreviations used as designations for various standard thread forms, thread series, and feature designations for use on drawings.
- symmetrical deviation
- Tolerance values that have equal maximum and minimum values.
- symmetrical line
- Segments, that are symmetrical to the line segments drawn and automatically mirrored at a centerline.
- system editor key
- A configuration variable that is stored in the window's registry. These variables are usually modified in the system editor, in which they are referred to as keys. The system editor is displayed using the AMOPTIONS command, clicking the AM:Preferences tab and then clicking the System button.
- tangent
- A condition where two items share the same slope at a specified point.
- taper
- Taper, as used for fasteners, is the angle between one side and the axis of the fastener. Taper may refer to head, shank or some other feature or fastener.
- taper angle
- The angle where a thread is tapered as it is created.
- template
- A preformatted drawing that serves as a starting point for a new drawing. While creating a new drawing you are prompted to select a template. Any drawing file (DWG file) can be saved as a template file (DWT file). Templates typically contain company-specific preferences such as standards, title blocks and so on.
- thread
- A thread is a portion of a screw thread encompassed by one pitch. On a single-start thread it is equal to one turn.
- thread designations
- Thread series designations are capital letter abbreviations of names used on drawings, in tables, and otherwise to designate various forms of thread and thread series, and commonly consist of combinations of such abbreviations.
- threads per inch
- The number of thread pitches per inch. It is the reciprocal of the axial pitch value in inches.
- title block
- A title block contains a series of attributes; some already have values. The pre-assigned values can be modified, and the vacant attributes can be completed with new values.
- tolerance
- The total amount by which a given dimension (nominal size) may vary (for example, 20 0.1).
The total amount of variation permitted for the size of a dimension. It is the difference between the maximum limit of size and the minimum limit of size.
A tolerance is the total permissible variation of size. The tolerance is the difference between the limits of size.
- torsion spring
- A spring type that can absorb torque forces.
- transition
- A mating in between a true Clearance or Interference.
- truss head
- The truss head has a low rounded top surface with a flat bearing surface. For a given screw size, the diameter of the truss head is larger than the diameter of the corresponding round head.
- turns per inch
- The number of turns per inch is the reciprocal of the lead in inches.
- UCS
- User coordinate system. A user-defined coordinate system that defines the orientation of the X, Y, and Z axes in 3D space. The UCS determines the default placement of geometry in the drawing. See also world coordinate system (WCS).
- upper deviation
- The positive (or highest) deviation from the nominal size.
- variation of fit
- In a mating, the difference between the tightest possible and loosest possible fit combinations.
- vario database
- A database that manages all parametric templates. The database is essential for activating and storing templates.
- velocity (cam plate)
- Graph of the speed of the straight driven element, or the rotation angle of a rocker and the cam plate angle of rotation.
- view definition
- A non-graphical description of a 2d mechanical structure component view that AutoCAD Mechanical toolset saves in the data area of a drawing, similar to how it saves a block definition.
- view scale
- The scale of a base drawing relative to the model scale. Also the scale of dependent views relative to the base view.
- viewport
-
In Drawing mode, a bounded area that displays a drawing view.
- virtual intersection
- Two lines have a virtual intersection if they are not parallel. The virtual intersection is the intersection of the line extensions.
- welding
- Welding of metals requires that they be heated to a molten state so that they fuse together.
- welding symbol
- Specifies information for welding.
- width across corners
- The width across corners of hexagon, square or rectangular shaped fasteners is the distance measured perpendicular to the axis of the fastener from the intersection of two sides to the intersection of the two opposite sides.
- width across flats
- The width across flats of hexagon or square heads of fasteners is the distance measured perpendicular to the fastener axis across opposite sides of the fastener.
- working layer
- The layer where you are currently working.
- world coordinate system (WCS)
- A coordinate system used as the basis for defining all objects and other coordinate systems. See also user coordinate system (UCS).
- wrench opening
- In the shaft generator, sectional views for two-sided, four-sided, six-sided segments of shafts that fit a standard wrench.