Creating a symbolic tapered NPT thread 1

[DaveJFT]

Hi Folks,

I'm trying to create an external symbolic tapered NPT thread. I've been trying to use the Thread tool but I'm hitting a few problems.

Firstly, I created the outer (tapered) profile of the thread and tried to apply the symbolic thread to that thread surface but the tool won't let me pick the tapered surface despite the "tapered" button in the form being ticked. Instead it'll pick the cylindrical surface behind it and applies the thread to that surface but obviously that's not what I want.

Secondly, I removed the thread taper from my profile revolve feature and applied the symbolic thread to that but the thread generated is not tapered despite the "tapered" button in the form being ticked.

What is the best practice method of creating this symbolic tapered NPT thread? Would there be a tutorial somewhere?

Many thanks

Dave

 

[wacio]

Dave,

Create thread without taper, place view with it on the drawing and you will see the result.

Regards.
Wacio

NX3 + TC9

 

[DaveJFT]

Hi wacio, thanks for your reply.

That's an interesting result, however this has to be considered a NX fail as it leads to an unrepresentative CAD model. Someone viewing the model within Vis or Tc Eng would not see this thread as NPT but as a straight thread. It's even more of an issue if you do not have access to the drawing. It is also unsuitable for threads that have specific lead-in chamfer requirements as these are not carried through to the drawing.

A much better function would be to be able to apply the Thread tool to the cylindrical surface which then modifies the 3D geometry accordingly (with taper and symbolic thread) or allow selection of the tapered surface as modelled.

 

[JohnRBaker]

Symbolic Threads are intended for use wirh Drawings and these 'threaded' features need to be part of the model's 'documentation'. If your intention is to create visually accurate renderings of your model, they you'll need to create actual geometric models representing threaded features, such as seen here:

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

[DaveJFT]

Hi John,

Thanks for replying - I hoped you would.

It is a shame that that is the case as it has been decreed by my present company and every other company I've worked at that threads (in any CAD system) will not be modelled due the extra regeneration processing they require and the additional file size they generate causing a significant extra loading on the network and servers.

In practical terms modelled threads have little use except when defining non-standard threads or for "studio" purposes. When a thread is defined by an international standard there is no justification for modelling it for engineering purposes - a 3D representation of the thread is entirely adequate for visualization as is a 2D representation in accordance with the local drafting standard for drawings.

I don't really know why I wrote all this as it doesn't help me with what I'm trying to do - but thank you for listening! ;-)

 

[icconian]

Bumping this old topic. We need to model an NPT (tapped pipe thread) hole in an object. Is it hoping too much for a handy-dandy "single click" command? Thx!

 

[cowski]

What version of NX are you working with?
In recent versions (don't remember when it was introduced) have a "threaded hole" option within the "hole" command which include NPT threads. It is more than a "single click", but it is a built in tool.

www.nxjournaling.com

 

[JohnRBaker]

Here's an image showing the three basic display styles which is supporting in NX drafting for tapered pipe threads:

BTW, this works with either the new (as of NX 5.0) Threaded-Hole features or the old (but still supported) 'Symbolic' Thread features which are added to existing holes.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

[icconian]

We're on NX 7.5 (well, our user is. I'm just an interested third party for now).
I will pass along the tip, thanks! That's the sort of thing we were looking for.

 

[moog2]

with the threaded hole feature, where is the option to pick ,simplified,detailed or schematic?

 

[Arkance/PhoeNX]

It's a function of the drawing view, not the thread.

Anthony Galante
Technical Resource Coordinator

NX5.0.6, NX6.0.5, NX7.5.0-> NX7.5.5 & NX8.0.0 -> NX8.0.3.4, NX8.5.0.23

 

[moog2]

aahHAaa! thanks Anthony..

 

[bbylls]

Tray putting the taper on the pipe after you put the thread on.