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Originally Posted by Ben Piecuch
Andy, I like your idea of having variable preload on your rollers. Have you done any actual "bolt torque vs. traction" tests with these wheels?
Also, I read through the assembly instructions for your wheels, which is very helpful. However, I've found that one student's idea of "finger tight" varies greatly, so much that finger tight can mean finger loose, or opps... I stripped all the treads. Do you have any more specific guidelines for the bolt torque?
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We have not done quantifiable tests on how much traction these wheels get with variable preload. This does need to be done, but I just have not had time yet.
As for the "finger tight" instructions, those same nuts are to be tightened with tools later on in the assembly. At the "finger tight" stage, the intent is to only hold the screw in place until the next assembly step is complete. Also... "finger tight" on a nylock nut is when the nylon engages the screw (this is described in step 7).
At this point, we don't have more bolt torque requirements. It really depends on the application and the requirements of what the drive chassis is needed to do. Loose rollers will allow maximum mobility and tight rollers will allow the transfer or more pushing force. FIRST teams will be happy with a range of movement between these two extremes.
Andy B.