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(12-28-2020, 05:18 AM)stoppy Wrote: For a flexible drum sander mandrel is a 1725 motor speed essential?
I have a 3450 rpm grinder I don’t use, that I could convert to permanent drum sander use.
Depends on the drum rating, I suppose. Mine is on 3450 JET, with a mop on the other end. Rated 5K.
Better to follow the leader than the pack. Less to step in.
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I think you will find 3450 rpm too fast for the flex drum sanders. They suggest a dual speed grinder, but a slow speed grinder works well. I started with an offbrand grinder and found the shaft diameter was off. Luckily, I dropped it on concrete and broke the housing. The Rikon grinder is has tighter tolerances. I did cut off the grinder threads in order to fit the Klingspor mop sander mandrels onto the shaft.
They told me anybody could do it, but I showed them.