Perfect Threads

ZooHead

Well-known member
Modeling threads in Cheetah 3D is not hard, but there are so many different ways to proceed.
Every time I've done it, I've tried various methods to deal with
the triangle or triangles left over at the end of the spiral.

What if you could send that edge back down the spiral or redirect,
recycle and re-purpose it as well as keeping all quad construction.

When you see it, it's so obvious and simple. How did I not figure this out before?
Here's how it looks:

Perfect Thread.jpg



Adding a ring cut to control the edge at the base of the thread.

Perfect Thread 02.jpg



With a Sub Division Modifier Level 3.

Perfect Thread 03.jpg


I'll post the steps soon...
 

MonkeyT

Active member
Here I go getting needlessly obsessive again, but the only question I have left is plumber's threads. The threads used on most plumbing fixtures are actually designed to tighten as you affix them - this allows merely screwing on a connection to tighten it to the point that water shouldn't leak instead of letting the nut ride up the entire length of the cut threads. It's practically invisible without a microscope, so it's really not very important, I was just wondering if the build techniques you laid out could accommodate threads that swell in thickness as they travel?
 

ZooHead

Well-known member
NPT National Pipe Thread also stands for National Pipe Taper.
I'll have to think about that, I've never tried before.

There are a few oddball standards like buttressed threads, like the ones on my Nalgene bottle.
Some are straight inside and tapered outside for special applications.

NPT_Dimensions.jpg
 

ZooHead

Well-known member
You can use a Taper Modifier on the tube before you push out the threads.
And don't use Normal Move when you do, use the Transform Tool
and scale out radially with the shift key.

First try is pretty close although the valleys should be narrower.

Tapered Thread.jpg
 

ZooHead

Well-known member
It's possible to work on threads symmetricly.
The symmetry is not mirrored, so the Mirror Tool and the Symmetry Modifier won't work.
But you can use the Ring Modifier in situations like this.

thread_splice.gif
 
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