Quote:
Originally Posted by Richard Wallace
Sorry I misunderstood your idea earlier.
So, if I am getting it correctly now, you would put a third bearing on the motor shaft, between the encoder and the pinion? Maybe a 608, with 8mm ID x 22mm OD x 7mm length. Then you'll have 31 - 9 - 7 = 15 mm left for the pinion and its retainer, so a standard 19 mm pinion would need to be cut down to about 12 mm. This will still be enough to engage a 3/8 inch (9.5 mm) gear tooth face. A little more demanding of axial gear alignment, with very tight axial clearances.
Edit: maybe leave about half of the 608's axial length protruding from the encoder adapter so it functions as a pilot for the gearbox? This would allow larger pinions (e.g., 14 tooth) to clear the pilot diameter, making gearbox assembly easier, while relieving some of the tight axial clearance problem.
|
Am I wrong in saying that the axial tolerances can be a little looser, as the whole cim/encoder assmbly is mounted by two screws with no boss? I'm not sure if that would work, but wouldn't the cim shaft be aligning this anyway?
I would actually use an 8mm ID x 16mm OD 5mm long bearing. On a 3/16" thick plate, it only sticks out about a hundreth of an inch. It has a pretty high load rating too.