View Full Version : just another tool post grinder question

loose nut
02-29-2008, 07:58 PM
Small tool post grinders with wheels about 3" in dia. have motors rated at about 1/5, 1/4, or 1/3 horse power depending on the model. For these sizes, when taking light cuts (.001" or less) does the power the motors have matter that much and if so why.

Looking to buy and would like info on this.

Occasional use only not production work.

02-29-2008, 08:04 PM
The Quorn tool and cutter grinder kit I got came with a 1/8 hp motor. It seems to be okay, the little I've used it, for 4" wheels, though if I really used it a lot I think it might be a little small.

I can't see any motor larger than 1/8 hp being a problem for a 3" wheel though, especially for a toolpost grinder where (presumably) you aren't going to do really heavy grinding.

02-29-2008, 09:30 PM
With a 3" wheel you're going to want to "pulley-down" the speed any way. That gives more torque. I've got an old Dumore 44? (1/4hp) that can take .005+ off with a 3" wheel and barely grunts. Use a coolant when you take that much though. The part heats up fast. I normally cut to within 2-3 thou then finish with the grinding. .001" is a piece of cake but I set up an indicator and use the 30* compound. For me, .0002~ is fine work. That's about all these old eyes can manage with my measuring tools.

03-01-2008, 12:15 PM
Loose Nut: I have an Atlas 1/4 hp tool post grinder that I dont want. E-mail me at g.j.duffield@sympatico.ca if you are interested.

loose nut
03-01-2008, 09:30 PM
It's in the mail.