Belt grinder motor mount?

WhitleyStu

WhitleyStu

Keep'em scary sharp!!!
Joined
Dec 8, 2006
Messages
831
I am ready to order my motor and Coote belt grinder. I spoke to Norm Coote and he has the step pulleys I need for the belt grinder and motor. The only question I have is how do you gents with step pulleys mount your motors so you can easily move the drive belts from one pulley to another for speed changes. I found this adjustable motor mount at Grainger and thought about ordering one for my setup. Any input would be appreciated…
 
I think Norm's literature talks about a hinged mount where the weight of the motor maintains the tension. Easy to lift the tension off for belt moves. Doesn't seem like uch tension, but maybe it doesn't need to be. :confused:

Rob!
 
I mounted my motor on a peice of 3/4" plywood with a heavy duty hinge attached to the bottom of the plywood and to the base everything is on. Super simple and works great.
 
If the hinge alone isn't enough tension for you, you can cut a slot in the plywood base across from the hinge, just large enough to fit a 3/8" bolt. then, mount a eyebolt to your table/grinder stand under the slot. a small pipe hanger works well. Then you can screw a nut and washer onto the eyebolt to add tension to your motor. Once you have it set, you can just push down a bit to release the bolt when it comes time to change the belt, or set it on another pulley.

Ken
 
I am in the process of setting up a grinder also. I spoke with Rob Frink (KMG) about the step pulleys and he said that he designed his so that the belt could be "walked " off one step to the next, without adjusting every time. I've read that other knife makers have done this and had no problems. I guess the belt does not have to be very tight to work correctly.

The belt that came with mine was quite short, making about a 7 1/2" center to center distance.

Hope this helps.
Richard
 
Thanks for all the input. It is of great help. I'll post pics when everything is assembled...
 
Rob! said:
I think Norm's literature talks about a hinged mount where the weight of the motor maintains the tension. Easy to lift the tension off for belt moves. Doesn't seem like uch tension, but maybe it doesn't need to be. :confused:

Rob!
Click to expand...


The motor I have on my Coote belt grinder weighs 35 lbs, That's more than enough tension on the belt.
 
WhitleyStu said:
I am ready to order my motor and Coote belt grinder. I spoke to Norm Coote and he has the step pulleys I need for the belt grinder and motor. The only question I have is how do you gents with step pulleys mount your motors so you can easily move the drive belts from one pulley to another for speed changes. I found this adjustable motor mount at Grainger and thought about ordering one for my setup. Any input would be appreciated…
Click to expand...

The motor mount you have listed looks like it is not made to be adjusted after you get the tension set. All it is a 4 motor mounting bolts in 4 elongated slots. You would have to loosen all four bolts and slide the motor around to change steps on the pulley. The description at the bottom says it's for HVAC use and I am thinking it's made to be set and left alone.

And the price is high too, especially compared to a $4 door hinge and some plywood. I used some 1/2" paper based micarta to make the table and motor mount for my Coote. Norm will send you some instructions with your machine on how to build a table and mount.
 
Actually, the belt tension is meant to be adjusted after the motor is mounted and secured. On the right side of the photo of the base on Grainger's page is a hex head bolt. That bolt moves the carriage under the top plate that contains the 4 bolts that the motor is attached to. This provides about 3 1/2" of adjustment depending on the size of the motor base; larger size bases have more adjustment. Pictured is the underside of my adjustable motor base:

img067Small.jpg


The price for this base from Graingers is a bargain compared to how much it sells for elsewhere. It's offered by Leeson, Baldor, Dayton and others for Nema frame sizes starting at Nema 48 and larger. I needed one for a 48 frame motor and had to pay $40.00 at Motion Industries. If Grainger had it in that size, I surely would have bought it from them for the $16.42 they're asking for the 56 frame motor base. This is a very neat and professional way to mount a motor if you're using an adjustable pulley in order to change belt speeds.
 
I have my motors to all my grinders mounted on the ones like that is pictures you can make the belt as tight as you want..they work great..I think I paid about 20 bucks for mine
 
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