* CAM: thread-mill Shape , more robust model
Purpose: prevent solver dumping arcane coding errors to report window if "crest" value is (legitimately) set to zero by user.
Single tooth thread-mill tools exist which have a sharp point, ie zero flat "crest " surface. Thus the user can reasonably expect to configure a zero dimension to the truncated end of the tool if it is not truncated. This should not provoke an error condition and certainly not crash the model and dump lots of arcane developer info on the machinist user.
The problem is that a zero dimension makes two points concurrent and removes an edge from the model. This leads to and ill-defined model which crashes the solver. The user should not be exposed to this kind of coding breakage when entering legitimate data for a tool shape. The solution (or workaround) here is to add a very small faction of the shaft diameter to the user supplied zero to prevent the solver crashing. Since this is proportional to the tool shaft it will scale to any use of the tool shape without disrupting path accuracy.
This is a drop in replacement for the existing file and caters for both types of this tool: truncated tip and pointed tip.
* threadmill Shape update
This thread-mill Shape file uses max() in the expression for crest.
This allows user setting zero crest by adding a small finite dimension to prevent the solver crashing, while not making any change to finite crest tools.
Best of both worlds.
Fixed a misspelling, added some commas, changed all occurrences of
PDN (PartDesignNext) or PD to PartDesign to improve readability.
(And update the text, since PartDesignNext was new in version
0.17 or so, and stable is now 0.21.2. )
