Quote:
Originally Posted by Jared
This is slightly off topic, but I'm curious; has anybody had an actual problem with over constraining a hex shaft in an FRC application?
The versaplanetary gearboxes have two bearings on the output shaft, so anybody who supports the vp output shaft with an additional bearing is locating the shaft in three places. We ran setups with four bearings on the same shaft both this year and last year with no problems, including a bearing that was pressed into a welded sleeve that couldn't have been extremely accurate.
I'd guess we can get away with this because of the fit between hex shafts and bearings and the clearance holes for standoff bolts. A #10 is a slip fit in a .1875" hole, so it has almost .01" of slop in the recommended .196" clearance.
I'd also assume that the hex bearings which tend to come in a little oversize are also pretty forgiving.
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We had some minor problems with inserting the hex shafts into bearings in the new VEX clamping gearboxes and the clamping bearing blocks. The hex shaft would go into the hex bearing on one side just fine but would not go into the bearing on the other side. We had to loosen the clamping screws before the hex shaft would go into the second hex bearing. I suspect that the axes of the two bearings were not perfectly in line and/or parallel. Once the hex shaft is inserted into both bearings, the clamping screws could be tightened and the shaft would spin freely. I guess the plastic around the bearings deform slightly to allow them to align to the hex shaft.