how to add a dimension to a thread.. 1

[mechjames]

Hi Guys,
how to I add a dimension callout to a thread I have created in drafting space? Is the best way to do it via 'feature parameters' - can I change the way this annotation looks?

many thanks,
James

NX6

 

[JohnRBaker]

I'm not sure what you mean by "...a thread I have created in drafting space?"

If the threaded-hole was added as a feature of your model, then the 'Feature Parameters' approach in Drafting is the way to go.

John R. Baker, P.E.
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Product Design Solutions
Siemens PLM Software Inc.
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To an Engineer, the glass is twice as big as it needs to be.

 

[mechjames]

Hi John,
sorry yes, that is what I meant. I have created a thread as a feature of my model. I want to dimension that thread in the drafting space - how do I do it?

Additionally if the thread is an internal thread what diameter should I give the starting hole? - the minor diameter as per the chosen thread specifications? and does this matter...

many thanks,
James

 

[looslib]

The threaded hole callout should be formatted with the information from the thread hole files. The tap drill diameter should come into the drafting callout.

NOTE: The tap drill diameter is based on a theoretical value to the closest drill size. This may NOT be what your shop uses as the tap drill size. Edit the thread hole files to your shop's requirements.


"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

 

[JohnRBaker]

Once you have created your drawing views, go to...

Insert -> Dimension -> Feature Parameters...

...and then expand the part file list until you find the desired features. Select them and then select the view you wish to see the dimension(s) created in and then hit OK.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

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

 

[BOPdesigner]

Make sure your parts (components) which have the threaded features are fully loaded, otherwise they won't show up in the feature paramaters list to pick from.

 

[mechjames]

Hi Guys,
ok, many thanks, got that. One more related question - When applying the thread function as per information from the thread hole files I get the message 'cylindrical face diameter is in conflict with thread definition'. The thread applies ok but I am wondering why I get the message and what it means..

many thanks
James

 

[JohnRBaker]

Are you creating a 'Threaded Hole' using the Hole feature function or are you adding a 'Symbolic Thread' to an existing hole?

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

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

 

[mechjames]

Hi John,
I am adding a symbolic thread to an existing hole...

thanks,
James.

 

[BOPdesigner]

I thought that if you appled a thread to an existing hole and this confict existed that it would change the diameter of your hole to match your thread definition, but when I just tried this that was not the case. I know that when you apply external threads to a cylinder or boss that the thread feature will change the diameter of cylintrical feature to match the thread definition.

 

[looslib]

The tap drill diameter of a threaded hole should change when you apply a thread to an existing hole. It used to in V16-NX1. Haven't used it since then.


"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

 

[JohnRBaker]

NOT if the hole was created using the new Hole function introduced in NX 5.0. The Symbolic Thread feature is unable to treat the new Hole features the same as it did the old, pre-NX 5.0, Hole features. The parameterizion of the new hole feature is different than the way is was done for the older hole feature, making it incompatible with the legacy Symbolic Thread function, at least to the extent that it will automatically update the existing Hole feature so that it represents the proper pilot drill size. And before you ask, this is NOT considered to be a regression or even a 'bug' since the new Hole function provides for the creation of a true 'Threaded-Hole' feature, which is now the recommended solution for when the user needs to that sort of design feature.

BTW, this only applies to Symbolic Threads. If you wish to create a Detailed Thread using the existing function, that will still work with the new Hole features since this will replace the existing hole with a completely new set of faces (the threads themselves) so there was no need to even attempt to update the hole diameter.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

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

 

[mechjames]

Hi John,
many thanks for the info. So what would be the preferred way to create an internal threaded hole? - create the hole with the hole feature and then add the symbolic thread feature to that hole...?

If adding a symbolic thread to an existing hole created a different way (not via the hole feature) it is safe to ignore the face diameter conflict..?

cheers,
James

 

[JohnRBaker]

The new Hole function supports the creation of normal internal (female) threaded-holes based on a wide varity of thread forms. For designs which will be assembled by screwing bolts into a threaded-hole, then the new Hole feature should you your first and ONLY choice.

Now if you're talking about something other than a threaded-hole, such as a bored pocket with a internal thread, while it's possible that you could still make this using a 'threaded-hole' feature, it might make more sense to simply model the as-rough-bored opening and then add a symbolic thread feature. It was exactly for situations like this, as well as external (male) threads, that we kept the existing function in NX since there are some things which just don't qualify as a 'threaded-hole'.

As for what to do about the warning message, all it's telling you is that NX was not able to update the pilot drill size, which means that if it's important that the pilot drill size be precise, you will be responsible for editing the hole diameter yourself since you cannot depend on the Symbolic Thread operation doing it for you. If the diameter is not critical, than just leave it as is as long as it looks OK.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

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

 

[mechjames]

Great stuff... All clear now, many thanks guys!

cheers, James