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Unread 22-12-2011, 00:10
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FRC #0095 (The Grasshoppers)
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Re: pic: Team 3266 CAD project

Quote:
Originally Posted by akoscielski3 View Post
I have to say that I do not like how the bearing block's are set up though. Because they are sitting on the top of the lower Brace all your wight from your robot will be on two bolts. If you had them on top then the weight would be on the brace. Another option is to make plates to put on either side of the wheel. Bolt the plates to the top and bottom braces and the axles bolted to the plates.
Consider that the working tensile load of a Grade 2 1/4-20 bolt is around 1,700lbf. That is to say you could hang 10-11 robots from a single Grade 2 1/4-20. I do not think the four bolts on what I assume is a dropped-center 6wd middle axle will have any issues at all.

Your design is structurally superior, and your suggestions to improve strength is sound, but I believe the design is already strong enough. More reinforcement will only add weight.
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