Thread interference? 1

[PrintScaffold]

Greetings all!

For some time now I've been thinking that interference check concept deserves some upgrade. I believe that the new category must introduced, namely thread interference. Threaded part interfere with each other by default, it's how thread is modeled in NX (and in other CAD systems). Therefore to report hard interference for thread is quire meaningless. I think that interference check procedure must not treat threaded parts as interfering part, and instead check if both male and female thread in a pait have matching type/diameter/pitch. Match would produce passed check for these parts, mismatch would be an error.

Any thoughts? I'm far from assuming that I'm the first who thought along these lines. I think this idea is quite obvious and the topic was raised in the part. But somehow it did not make it in the CAD systems so far.

 

[cubalibre000]

Hi,
I'm with you and Solid Edge has this option in the Interference tool from many years.
I add this as ER in NX from NX7, but nothing.
I will add again.

Thank you...

Using NX 8 and TC9.1

 

[PrintScaffold]

Hi Cubalibre00!

I didn't know that SolidEdge has this function. I know that Inventor does not. Thanks for the info!

 

[JohnRBaker]

If what you're talking about are all of the 'threads' associated with 'nuts & bolts' and if you're using the fasteners from the Siemens PLM supplied Machinery Library, one thing that you can do before running the Clearance Analysis is to create an 'Assembly Group' by Attribute. All of the Fasteners in the machinery Library have an Attribute assigned to them named 'CLASS' with a value of 'FASTENER'. So create a Component Group keying on the value of "CLASS" = "FASTENER" and once created you can then hide the entire group before you run the Clearance Analysis with the option set to only check 'Visible Objects'.

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.

 

[PrintScaffold]

A valid approach. But it would be very nice to have threads checked for mismarch of parameters as well.

 

[JohnRBaker]

Agreed!

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.

 

[PrintScaffold]

Also, if we exclude fasteners from the interference calculations, we won't find if they are misaligned with their respective holes!

 

[design0058]

This may be of some help. The progressive die wizard creates screws in this manner. The portion of a screw thread that is actually engaged in the tapped hole is the “tap drill size”. When an assembly interference check is performed the interference will be displayed as “touching” and can be ignored.

 

[PrintScaffold]

Still not the perfect way. A whole new category of interference is needed. Threads are really a special case.