mechanism clearance measure

[scroller2149]

I am modeling a cardan universal joint and running the joint through operating angles. I am starting at 0 degrees and running it up to 55 degrees. How do I set up a measure to determine the minimum clearance between the 2 yokes that are connected to the joint? I already know they clear, but I want 3mm clearance for forging/casting variation.

 

[mloew]

scroller2149,

If you have the BMX module, this is pretty easy. You will want to create an analysis feature that measures the distance between the two parts of interest (if you accept the default names, this will come out to be DISTANCE:FID_ANALYSIS1). Then, I would create a second analysis feature that is relation to calculate an error function (ERROR = DISTANCE:FID_ANALYSIS1 - 3). Then you can use a mechanism analysis feature and pass the ERROR:FID_ANALYSIS2 parameter through it. The mechanism analysis feature can output the minimum value of the simulation. You can now have the clearance parameterized as the design evolves.

Hope this helps!



Best regards,

Matthew Ian Loew


Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[jeff4136]

Sorry for the clutter... I'm just wondering (don't know) if there's an application for offset surface sets. Can they be used for interference checks?

 

[mloew]

jeff4136,

The distance between two offset surfaces could indeed be used for the clearance check.

Best regards,

Matthew Ian Loew


Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[scroller2149]

Thanks for the help. Unfortunately we do not have BMX, so I guess I cannot do it the easy way.

 

[jeff4136]

"... distance between two offset surfaces could ..."

Thank you, Matthew.