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3D interior thread


GaryJB

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I'll attach an example. There were some changes in the solid modeling engine from 2008 to 2010, so I'm not sure what it will look like when you open it...

Here's what I did to make the attached object.

Extrude along path to create a pipe w/ the correct ID and OD.

-Draw a triangle w/ part of one point where it looks like the threads should go...

-Insert 2D locus along center line of pipe

-Sweep (set sweep angle to 10*360? [however many rotations you need] and set pitch to whatever is really is - I used .125" which is probably really coarse - and I'm sure I made the triangle too big!)

Subtract solids.

hope this export works...

michaelk

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The end of the thread cut bugs me...

This is the same idea: 1 extrude along path + a sweep (10 revolutions @ .125 pitch) + a sweep w/ the same profile & pitch, but only 1/2 revolution.

After a solid subtraction like the last one, position the 1/2 sweep at the hard end of the thread cut. Then decrease the radius of the 1/2 sweep and reposition until the thread doesn't have a "hard end".

Subtract solid.

There must be a more elegant solution that I'm not seeing...

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