Pattern 35 is a fitting that will only produce straight duct that will be decoiled. The dimensional input, item, connectors and seam information can all be entered as normal. The important part of this fitting is the fittings options. The way that straight will actually be produced is specified in the Options tab settings. This is described below.
Takeoff Dialog Options Tab
The Takeoff dialog Options tab includes the following options:
Straight Type: This option determines how many pieces the straight duct will be made in. The choice are Auto, 1 Part Straight, 2xL, 1xU-1xI, 4xI M-M F-F, 4xI M-F. These are explained below.
1 Part Straight: 1 piece consisting of all 4 sides.
2 x L: 2 pieces each containing 2 sides.
1 x U, 1 x I: 2 pieces, 1 containing 3 sides, 1 containing 1 side.
4xI, M-M, F-F: 4 pieces, each containing 1 side with either all male or all female seams on each part.
4xI, M-F: 4 pieces, each containing 1 side with a male and female allowance on each part.
Auto: The type will be set automatically so that the overall length of any one piece does not exceed the value set in the Maximum Sheet Size option. The types attempted, in order, are 1 Part Straight / 2 x L / 4xI, M-F. The pattern will report invalid dimensions if none of these fit.
Duct Length: This determine how the length of duct will be entered. The available options are (mm) or (m).
Allow Multiple Straights: The pattern can produce multiple straights from a single length entry, based on the Standard Straight length settings in the Specifications table. If this option is set to Yes, an error will be reported if more than 1 straight is produced. This would normally only be set to prevent user errors when entering single lengths.
Connector Fold Notches: These are provided only as a means of matching the straight developed by the program to the straight produced on the decoiler as closely as possible. Usually this will be to make the areas, and therefore the weights, more accurate. When the straight is formed in 1, 2 or 3-parts, folds are required along the length of the duct to form the fitting. These options control the notches that are applied at the connector ends for these fold positions. Separate options are available for each end, shown by #1 and #2. The choices are Use Default or Use Vee Notch. If Use Default is selected, the Notch applied to the connector will be used. If Use Vee Notch is selected, the two following vee notch options will be used.
Vee Notch Depth: Enter a value for the depth of the notch or select Auto, and the depth of the vee notch is automatically set to match the allowance allocated to the connector. If the allowance is zero, a marker notch is applied.
Vee Notch Angle: Enter a value for the angle of the vee notch. A smaller angle gives a tighter Vee Notch.
Maximum Sheet Size: The amount entered here will determine the maximum stretchout of the duct, and therefore the Straight Type used.
Allow Split Sides : These options can only be used when the decoiler supports seams along the side of the straight, as well as at the corners. Select Yes or No as appropriate.
Maximum Fold Length: The value entered here determines the longest side that can be folded on the decoiler.
Minimum Fold Length: The shortest side that can be folded on the decoiler is determined by the value entered here.
STD Straight: If Yes is selected only one straight will be produced, and it will be reported as a Standard straight, regardless of the Standard Straight length setting in the Specifications table.