|Forum topic by ElChe||posted 02-03-2015 01:33 PM||722 views||0 times favorited||4 replies|
02-03-2015 01:33 PM
I just scored a free fake 3/4 hp (5 amps) 8” grinder that runs at 3450 rpm. I want to slow it down to 1750 rpm or lower to put a radius grind on chisels and plane irons prior to sharpening. It is quiet so I am assuming it is some sort of induction motor so I don’t think I can slow it down with a rheostat. My thought is to build a platform for it where I can mount pulleys on the shaft and then run belts to a separate shaft with pulleys for a Norton friable grinding wheel on one side and a buffing wheel on the other side. Has anyone done this? If so what size pulleys?
I’m cheap and don’t want to fork out the money for a slow speed grinder as I can source a nice shaft/ pulleys/bearings from a buddy who works with HVAC.
Final question: if I’m careful with grinding and take my time so as not to overheat the tools, can I run a Norton type friable wheel at 3450 rpm for the bevel grind? I plan on using a Lee Valley tool rest as the stock tool rests on grinders even expensive ones are marginal to awful (the tool rests on my freebie grinder are awful stamped crap).
-- Tom - Measure twice cut once. Then measure again. Curse. Fudge.