Angle constraint using 3 objects 1

[SiW979]

I have attached a small assembly I use now and again to teach arrangements and arrangement specific assembly constraints/mating conditions. However this is the first time I have had to use it since NX4 and now we are 7.5. I would have thought that using the Orient Angle option I could have picked the centre line of one of the blue hubs, then (with ref set at entire part) pick a datum on the in the inside face of the brake disc and a paralell datum at the centre of the axle so I could assign an angle of 35 degrees for example. However so far I have failed miserably which is a first for me and assembly contraints as so far I love them and have found them pretty straight forward. Any help woud be much appreciated.

Best regards

Simon NX7.5.3 - TC 8

http://www.jcb.com

 

[JohnRBaker]

The Datum Planes/Faces that you wish to control the angle between must pass through the axis that you selected in the first pick, as shown below (I added the Blue Datum Plane to the Hub Component).

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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

 

[SiW979]

John

Thanks for that. I'd of thought that providing that position of the datums should be irrelevant and that NX should perhaps be able to solve such a simple operation based on a specified axis and then any face, plane or edge. Am I missing a trick? The picture didn't come through by the way. Once again, thank you for your help.



Best regards

Simon NX7.5.3 - TC 8

http://www.jcb.com

 

[JohnRBaker]

I can see the picture no problem (but just in case, I've included it as a attachment to this response).

Note that there are 2 Angle options, the first, '3D Angle', does provide some degree of inferrencing of an axis, but then it's also more susceptible to update problems if you make large changes in the angle. The advantage of the 'Orient Angle' approach is that it's more robust and predictable, but like everything in life, more robustness often comes with restrictions, in this case the system is expecting inputs which in themselves are less ambiguous, which is why you only need to select TWO objects using the '3D Angle' option but you're required to pick THREE with the 'Orient Angle' approach and they have to relate to each other in a manner which makes sense.

In other words, if all you're doing is setting a static angle, '3D Angle' is quick and easy to use, but if your need is to make changes by editing the angle, I'd stick with the 'Oreint Angle' option.

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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