SWEEPING A REAL THREAD ONTO A SHAPE
Posted: Tue Sep 02, 2008 4:07 pm
Hello,
I find that the function SHAPE, MECHANICAL, THREAD is not adequate for my needs. I sometimes need to model actual threads for various reasons.
I have tried creating the thread profile and sweeping it along a helix but it fails to give me sufficient results. For example, sweep a 60° v-thread with sharp root & crest onto a cylinder. It can be done but you'll have to fight for it and the result does not "project" correctly in a draft document.
I would like an enhancement that allows the creation of truly accurate solid threads. I would especially appreciate if it was implemented in such a way that I wouldn't need to sweep the geometry... The best way would be to include this new feature under the existing SHAPE, MECHANICAL, THREAD function but with a new section for accurate threads and appropriate dialog fields which would allow us to specify all features of any thread... For example, Major Dia, pitch, flank angle, crest radius or crest flat, root radius or root flat, etc... It would also be very nice to use alternate thread forms such as ACME, Square, Buttress, Whitworth, Taper Pipe thread, etc...
All of these features would be nice but just to clarify the most important thing would be to improve the sweeping function to allow me to sweep thread type geometry along a helix without errors. It seems that currently there are parasolid errors where the swept geometry overlaps itself...
Looking at the first picture you'd think everything was perfect but the (zoomed-in) second picture shows that the geometry is a mess at the crest of the thread.
I find that the function SHAPE, MECHANICAL, THREAD is not adequate for my needs. I sometimes need to model actual threads for various reasons.
I have tried creating the thread profile and sweeping it along a helix but it fails to give me sufficient results. For example, sweep a 60° v-thread with sharp root & crest onto a cylinder. It can be done but you'll have to fight for it and the result does not "project" correctly in a draft document.
I would like an enhancement that allows the creation of truly accurate solid threads. I would especially appreciate if it was implemented in such a way that I wouldn't need to sweep the geometry... The best way would be to include this new feature under the existing SHAPE, MECHANICAL, THREAD function but with a new section for accurate threads and appropriate dialog fields which would allow us to specify all features of any thread... For example, Major Dia, pitch, flank angle, crest radius or crest flat, root radius or root flat, etc... It would also be very nice to use alternate thread forms such as ACME, Square, Buttress, Whitworth, Taper Pipe thread, etc...
All of these features would be nice but just to clarify the most important thing would be to improve the sweeping function to allow me to sweep thread type geometry along a helix without errors. It seems that currently there are parasolid errors where the swept geometry overlaps itself...
Looking at the first picture you'd think everything was perfect but the (zoomed-in) second picture shows that the geometry is a mess at the crest of the thread.