My buddy lent me a Rockwell 6-inch jointer, series 32 220, sn 1727494.
But the main pulley belt wheel that rides the motor axle whobbles. No matter the key (shear pin) I install, it still whobbles – me thinks the prior whobbling worn down the “inset” that lines the inside of the pulley wheel axle hole. This inset looks like high tensile steel that lines 85% of the interior, leaving a slot to accept the key. The pulley looks like galvenized steel or extruded aluminum, with the numbers 5700 stampled on it.
Any ideas?
Steev
Replies
What you are seeing on the inside of the pulley is probably just a steel bushing that you can buy to convert a 3/4" bore pulley into a 5/8 " pulley, or 5/8" to 1/2". The inserts almost always add some wobble to the pulley's rim. They are soft steel so they will wear out if they aren't a tight fit on the shaft and start to shift around with each revolution of the shaft.
The fix in any case is just to buy a new pulley of the proper bore size and outside diameter, you can get them from numerous sources including a real hardware store or some auto parts stores. There is no need to go to the manufacturer who will charge you ten times more for the identical part.
It is also possible that the pulley's rim is bent and you can just tap it back into alignment, or that the motor's shaft is either bent or worn out which is hard to impossible to fix.
John White, Shop Manager, Fine Woodworking Magazine
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