Acceptable misalignment between holes on mating parts?

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A design involving a stack of CSK PC/104 PCB boards has a 0.1mm misalignment in screw holes for HEX spacers, which raises concerns about assembly. The holes are M3 clearance, and the drill size used was 3.3mm, allowing for a positioning tolerance of ±0.150mm. This suggests that the misalignment is likely acceptable and should not pose significant issues during assembly. Participants in the discussion agree that as long as tolerances do not compound negatively, the assembly should work. Overall, the situation appears manageable with the given tolerances.
Steven9
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Hi,

I am working on a design that has a stack of CSK PC/104 pcb boards fastened togther using HEX spacers.

One of the PCB boards is being designed by an different design team. They have already manufactured their board but it turns out that the screw holes for the Hex spacers are mislaigned to the board that it will be fastened to by 0.1mm.

The holes are M3 clearance. Does anyone Know if this will cause a problem during assembly? Is 0.1mm an acceptable misalignment? I believe normal PCB manufacturing tolerance is 0.075mm

Thanks,

Steven
 
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It depends on the drill size that was called out, if it was 3.3 mm, then it will probably be fine.
 
Thanks MRFMengineer, its was a 3.3mm drill size that was called out.
 
So, that gives you +-0.150 mm positioning tolerance, so as long as the engineering gods did not stack up all the tolerances against you, it should work.
 
Yeah, hopefully we will get a bit of luck! Thanks, for your comments...things a bit clearer now!
 

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