LumberJocks Woodworking Forum banner

Grinder motor speed

1K views 5 replies 6 participants last post by  LeeMills 
#1 · (Edited by Moderator)
I am making m own grinder buffingstation. Going to use cbn wheels. Can order any motor. My question is ive seen tormek set ups and 1750 rpm set ups. What would be a good hp and rpm for the motor as can pulley to any speed.
 
#4 · (Edited by Moderator)
This is mine. It runs an industrial, variable speed, reversible, one horse sewing machine motor. You can buy them, with the controller, for around two hundred. They are remarkable. I can run mine from zero to twenty-five hundred RPM. Today, I tried to bog it down pressing a HSS skew against the CBN wheel and I could not hear ANY bogging.

The DC motor replaced a 220, 1700 RPM motor and I would never go back.

Most my grinding is done at around five hundred RPM. If I'm not re-profiling a knife or chisel, or if I want to keep heat down, why would I go faster?

Table Wood Desk Workbench Tool


Wood Window blind Workbench Toolroom Gas
 

Attachments

#5 ·
Everyone has good points. I think the lack of direct advice though, is due to some missing information. Most importantly, what is the primary goal of your grinder? I would assume it's probably for sharpening turning tools since your using CBN? What size wheels are you using, 6 or 8"? An 8" wheel will have a higher speed at the cut than a 6" with the same rotational speed.

I think that variable speed is the way to go in either case, if it's within budget. A setup like Kelly's is ideal but using a stepped pulley system like Papadan suggests is a more economical solution. I've never used CBN but I think most turners use them on slow speed grinders (1750 rpm).
 
#6 · (Edited by Moderator)
This is my grinding station I made back in the early 80's.
Motor is underneath on a hinged plate and the weight provides plenty of tightness for the belt.
Six inch wheels but plenty of room for eight inch.
L front white stone, R front Cratex for honing, R rear now has a green disc, L rear stropping charged with jewelers rogue.
Will run forward or reverse. Spindle will accept a 1/2" drill chuck for special needs (Top R).
Front is about 1750 back is about 1200.
Sewing machine Gas Engineering Machine tool Machine
 

Attachments

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top