Quote:
Originally Posted by Bruceb
Picked up one of the toolking referb dewalts. The first thing I noticed was that the shaft that the chuck is screwed to is held into the gearcase on just a standard taper. The experience I have with taper fittings is that if you put a continuous side force on them they eventually loosen up and fall out. How do you keep this from happening on the dewalt?
Bruce
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Like a Jacobs taper, except on the gearbox end rather than the chuck end? The old XRP (from the original NBD) used a straight (well, stepped) shaft with two opposing flats on the gearbox end.
In any event, the one year I used one of these on the robot, to avoid trying to deal with the standard shaft and an adapter for the drive sprockets, I just removed and replaced the entire output shaft with something else that interfaced with the gearbox output. (And then, because it was a weak steel, the torque promptly twisted it around until it deformed and failed. So if you go that route with an old XRP, harden the shaft—maybe some tempered O1 steel would work well.)
Maybe DeWalt switched to the taper drive in order to avoid breaking shafts?
Mentors are the guardrails:
Show the students how to do what they need to do, Step back and let the students do what they need to do, Nudge them back on course when they need a nudge, Insist, when necessary, that no one tries to juggle the chainsaws - gblake [more] 
18-05-2010, 12:40
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