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Creating a Tapered Thread

Creating a Tapered Thread

Creating a Tapered Thread

(OP)
Can anyone tell me how to create a tapered thread?  When I create a tapered helical path and then sweep a cross section thru that path, the entire cross section revolves along the helix.  I am trying to get the thread to enlarge along its axis while revolving on a helical path.  

Anyone know how to do this?

RE: Creating a Tapered Thread

Do you mean similar to an NPT thread?


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Creating a Tapered Thread

Your first two sentences make sense for the NPT type thread, but I'm confused by the third sentence.

Are you wanting the root dia to remain constant, but the crest to enlarge? If so, do the Swept Cut (from a tapered solid) along a non-tapered helix. The crest of the thread profile (cutting tool) should be larger than the OD of the solid.


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Creating a Tapered Thread

(OP)
I am trying to get the entire thread to enlarge like an NPT type thread (both root and tip)

The thread I am trying to create has a straight section which I create as follows:

Step 1 Create the cross sectional sketch. Create a helix. Sweep the cross section along the path of the helix.

Step 2 At some point along the thread, I now want to create a tapered section.  I now have tried to use the same cross sectional sketch, and move it along the path of a tapered helix.  The problem is that unlike the results in step 1 where the sketch is simply revolving along a helical path (but the axis of the thread remains straight), when you use a tapered helix, the entire thread corkscrews along the path of the helix.  All I want is that as the thread is winding along its axis, its size is increasing like a taper.

Any suggestions?

RE: Creating a Tapered Thread

I should clarify "(don't make half and then the other half)" - What I mean by that is don't make the sweep then try to attach  another helix to and already made feature.

For the Example you posted above:

Quote (Spurs):

Step 1 Create the cross sectional sketch. Create a helix. Sweep the cross section along the path of the helix.

Step 2 At some point along the thread, I now want to create a tapered section...

This is the incorrect way of making what you want.

Regards,

Scott Baugh, CSWP
www.scottjbaugh.com
FAQ731-376

RE: Creating a Tapered Thread

(OP)
Thank you for your help.  The techniques that you describe work well with a single start thread.  Unfortunately I have a 6 start thread.  I tried to use the techniques that you stated and the first start is fine.  When I create a circular pattern, everything locks up - probably memory overflow - even with a very short thread.

Is there another way of doing it that uses less memory?

RE: Creating a Tapered Thread

You don't create a circular pattern... You have to create each one separately and they have to be connected at each end and start point or that "Composite Curve" will not work.

Regards,

Scott Baugh, CSWP
www.scottjbaugh.com
FAQ731-376

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