Help understanding constraints for sequencing.
Help understanding constraints for sequencing.
(OP)
We are using nx 8.5.0.23
I have decided it’s time to teach myself about constraints and sequencing, without much luck. I would appreciate any suggestions for training exercises or videos that deal more with sliding components than rotating. Our company uses more slide and lifter arrangements.
Attached is a basic cam-actuator assembly that is causing me problems. The cams are being pushed .72 inches by the actuator pin and following the 10 degree profile of the core block.
My issue is determining what constraints to place, on which surfaces. The core block and core pin are fixed. I’ve tried so many different combinations of constraints/surfaces and still have not found the right combination, or understanding of why this surface needs that constraint, and that surface requires this constraint.
So I’m asking if someone could please walk me through this. This seems so straight forward, however frustration has set in, and without some outside help, I’m beat.
I have decided it’s time to teach myself about constraints and sequencing, without much luck. I would appreciate any suggestions for training exercises or videos that deal more with sliding components than rotating. Our company uses more slide and lifter arrangements.
Attached is a basic cam-actuator assembly that is causing me problems. The cams are being pushed .72 inches by the actuator pin and following the 10 degree profile of the core block.
My issue is determining what constraints to place, on which surfaces. The core block and core pin are fixed. I’ve tried so many different combinations of constraints/surfaces and still have not found the right combination, or understanding of why this surface needs that constraint, and that surface requires this constraint.
So I’m asking if someone could please walk me through this. This seems so straight forward, however frustration has set in, and without some outside help, I’m beat.





RE: Help understanding constraints for sequencing.
Please refer to the corrected file attached.
RE: Help understanding constraints for sequencing.
Anyway, until we get a bit more info...
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.
RE: Help understanding constraints for sequencing.
The comment about more work is understandable, but this was just an exercise for myself.
Thank you.
RE: Help understanding constraints for sequencing.
I placed a fixed constraint on the core block and core pin. I placed a distance constraint on the 10 degree face of the core block and lifter. and a parallel constraint on the upper and lower faces of the actuator and lifter. Using the assemblies move component, dynamic position the models behave as expected. Creating a motion sequence however, the actuator is pulled off the core pin on the 10 degree path. Note: I'm only working with 1 lifter in the prior steps, to reduce the variables of errors.
RE: Help understanding constraints for sequencing.
Anyway, look at the constraints I added to the model and I think you'll start to understand how this all works. BTW, I didn't mess with your 'Lifter' model as what you've done WILL work, just that it's not a good practice as it would be confusing to someone else if they had to debug your model or make changes to some of the Components such as the 'lifter'.
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.
RE: Help understanding constraints for sequencing.