Quote:
Originally Posted by Spirator
our robot managed to shear the drive sprocket off the centre wheel.
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You need greater
shear strength, not tensile strength.
It is possible that the fasteners were not as tight as they should have been. Loose fasteners in this application puts a lot of shear force on the fastener. Make sure they are torqued properly and use self-locking fasteners.
The goal is to use the clamping force of the fastener to create enough friction between the joined pieces to that the fastener is only in tension and not in shear.
Increasing the hardware size can help, but you can even shear 1/4-20 bolts if they're loose.
And we drafted without computers...forget the calculators...we used slide rules...the punchcards piled up so high we needed more office space...and we programmed in three feet of snow...up hill...both ways - Rich Kressly [more] 
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