Really underground garage
Join Date: Aug 2010
Location: mnts of Va
In my travels......it was some old furniture joint down in Highpoint NC......
They had a "factory",pnuematic sleeve or "pump" sander.Its basically a bench grinder as I'm understanding OP.But add a serious dose of steroids,haha.There was a pump sleeve on both ends of a 1 1/4" shaft.....no gaurds.The cool part was how well designed the large CI base unit* was.This is where the motor was housed.Belts came up through base's top,then went around shaft.
Probably from the 30's?Can't remember the "label",which is funny cause we have a bunch of their stuff,duh(senior moment).
*Their base was built in a time when casting uber heavy machine bases was de rigueur.Without goin off the deep end WRT old vs new manufacturing approaches............a decent base can be had,utilizing either gauge metal or cabinet ply as a carcass.The weight can be added with concrete.Usually we limit it to the space under the very bttm of cabmet.BUT.....in certain cases you can suspend a concrete "chunk"(technical term)by heavy springs or whatever......it "can" serve to dampen certain inbalance frequency's.BW
Those who say it cannot be done shouldn't interrupt the people doing it.