Stack up analysis and Shim calculation
Stack up analysis and Shim calculation
(OP)
hello all,
I've just done an axial stack up analysis for a loop in an assembly of 7 components. As a result,
The calculated shim thickness is .001+/- .009.
The questions is that do I need to modify some components' dimensions so that I can get a realistic shim thickness of at least .009 +/- .009 ?
Thanks for your help.
Sincerely,
lagump
HiPress Inc.
I've just done an axial stack up analysis for a loop in an assembly of 7 components. As a result,
The calculated shim thickness is .001+/- .009.
The questions is that do I need to modify some components' dimensions so that I can get a realistic shim thickness of at least .009 +/- .009 ?
Thanks for your help.
Sincerely,
lagump
HiPress Inc.





RE: Stack up analysis and Shim calculation
and i don't think you've allowed a sufficient +ve gapping to create a +ve shim ... ie one element in your stack up should be "shim allowance.
RE: Stack up analysis and Shim calculation
Thanks for your response.
Actually the tolerance bands are equally spread over the nominal dimensions which are +/- .001. In the loop, there are requirements of one interference of .0005 and a gap of .030.
What do you meant by "sufficient gapping" to create a shim and "shim allowance" for one element in my stack up? Please help to explain.
Thank you very much.
lagpump
RE: Stack up analysis and Shim calculation
a shim allowance would be a layer in your stack designed to be a shim, so that with nominal dimns it might be 0.02" thick but it could be 0.03" or 0.01", depending on your tolerancing. so you'd define it as a 0.03" thick peelable shim or maybe as a "shim, thickness TBD"
RE: Stack up analysis and Shim calculation
In addition, you may want to consider laminated shim stock
RE: Stack up analysis and Shim calculation
-Dustin
Professional Engineer
Pretty good with SolidWorks
RE: Stack up analysis and Shim calculation