Jump to content
Sign in to follow this  
foofer19

Tapered Thread (a l? NPT)

Recommended Posts

I'm trying to design an experiment that requires a gas-tight seal between a piece of rigid machined plastic (Lexan polycarbonate) and flexible (Teflon PFA) gas line. In the past, we've used a tapered pipe thread (1/8 NPT) adapter for this, however I can't find how to make a tapered threaded hole or adapter in Vectorworks 2008. Unfortunately, the manufacturer's web site doesn't contain a detailed CAD drawing for downloading, and I really need the threads to be accurate. Have I missed this feature somehow?

Share this post


Link to post
Guest Tomu

Sorry, no. There is no tapered threaded hole (pipe thread) in VectorWorks 2008.

Tom Urie

Nemetschek, N.A.

Share this post


Link to post

Tom,

You are right that there is no tool in VW, but you can certainly simulate an NPT pipe thread using a sweep.

I don't have time to look up the pitch and thread details right now, but you can make the positive threads and then do a subtraction to provide the threaded hole.

Pat

Share this post


Link to post

Try using a Tapered Helix . The problem is that threads are very dimensionally specific so without an established PIO you will need experiment.

Share this post


Link to post

Using Islandmon's helix spiral idea..

Attached is 1.75 mm 5 deg taper thread with the thread form on the top left.

Formed with Loft surface in birail sweep mode using NURBS created with Helix spiral command.

The thread form is accurate and the dimensions are precise but I haven't tried any solids operations with it - this can show up dodgy geometry

Charlie

Share this post


Link to post

Hi Charlie,

Could I ask you to describe that with a few more words. I cant replicate the result.

Share this post


Link to post

Sorry for the delay, somewhat busy.

As I recall :

- create the thread form from a reference source; a line drawing like the form on the top left of the posted attachment. Compose if needed and convert to nurbs.

- create the path using the helix spiral command; convert that to nurbs; duplicate and displace one thread pitch

- loft surface in birail sweep mode using the two spirals as the rail & the tread form as the surface.

That should get you there. I'll recreate it and post the file (lost the original) at some point...

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

 

7150 Riverwood Drive, Columbia, Maryland 21046, USA   |   Contact Us:   410-290-5114

 

© 2018 Vectorworks, Inc. All Rights Reserved. Vectorworks, Inc. is part of the Nemetschek Group.

×
×
  • Create New...