Use this option to define bolt openings.
To begin defining bolt openings, display the Drilling dialog from:
- Menu: Steel > Machining > Drill/Bolt
- Ribbon: ASD - Model > Bolts/Welds > Drill/Bolt
- Toolbar: Machining II > Drill/Bolt
- Command line: RBCS_DRILL.
Specify parameters:
- Under Properties, define basic information for bolt openings
After you select Depth, an edit field becomes accessible in which you can define the drilling depth. If Depth is not selected, an opening is drilled through a whole element.
After you select Slotted, the defined opening will be slot-shaped, and you can specify length of the opening rectilinear part and opening rotation angle, in respective edit fields. If Slotted is not selected, the opening will be circular.
Under Drillings in flanges, you can select Bottom flange or Top flange in order to position drillings in the bottom/top flange of a member section.
- In the middle part of the dialog, select a mode of defining bolt openings / drillings (the selected mode is displayed in the preview area)
- single bolt opening 
- rectangular arrangement of openings / drillings with a regular spacing of openings in both directions. When this opening type is selected, the following parameters need to be defined: - Number of rows and columns of openings / drillings (direction X and direction Y)
- Distances between rows and columns of openings / drillings (dx and dy)
- Number of openings / drillings
- Radius of a circle on which the centers of openings / drillings will be positioned
- Angle between the successive openings/bolts. If Auto fill is selected, openings will be arranged along the entire circumference length and the angle will be determined automatically.
- Number of rows and columns of openings / drillings (direction X and direction Y)
- Distances between successive openings in rows and columns of openings / drillings (dx and dy) (for example, 50 75 50 100)
- polar arrangement of openings / drillings (openings will be defined on an arc of a circle). When this opening type is selected, the following parameters need to be defined: 
- rectangular arrangement of openings / drillings with an irregular spacing of openings. When this opening type is selected, the following parameters need to be defined: - If Bolts is not selected, bolts will not be placed in the openings (all the edit fields are inaccessible). If the option is selected, bolts will be placed in the openings and the fields for defining bolt parameters (Diameter and Grade), are accessible. Click Setting to open the Bolt Settings dialog.
(Drill) - click this in order to select objects in which the openings are to be made and drill bolt openings based on parameters defined in the dialog.
The dialog opens showing the opening/bolt parameters defined recently.