There are certain rules which must be followed when creating an allowable .dgk profile for a form tool. The red spans in the figures below are spans which break the rules, and so does not create a form tool.
- All curves used to create a form tool must be lines or arc spans.
- All lines and arc spans must be concatenated to form one composite curve.
- The composite curve, or profile, must be convex. It cannot have any concave regions.
Concave region
- Each span must have an increasing X value.
Decreasing X value
- Each span must have an increasing Y value.
Decreasing Y value
- There cannot be any gaps between neighbouring spans.
Discontinuity
- The curve direction must be from 0,0 to the end of the form tool.
