Grizzly Belt Grinder

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These are a few photos of some of the modifications I have made to my Grizzly belt grinder. One photo shows a simple modification to the idler wheel to make it easier to remove belts. Other photos show how I added a third wheel to bring the grinding belt forward and a stronger platten modification for flat grinding. I have extra plattens with plate glass and hardened O-1 tool steel backings for smoothness and durability.

In some of the photos you can see how the tool rests (described below) work with the machine.

Also visible in the photos is the wooden shroud I built around the lower part of the grinder. This helps keep the dust down (on the back is a dust port hooked up via galvanized ducting to an industrial two-stage dust collector) and provides a little shelf space and a place for me to attach garage-sale-salvaged desk lamps for improved lighting.

I also have a plastic drywall mud tray that is filled with soapy water that sits just under the contact wheel and absorbs much of the dust as well.

I have designed a further modification to this grinder that will replace the shaft and motor with a new shaft, two pillow blocks, pulleys and a 2HP DC motor giving it variable speed capability and freeing up the Grizzly motor as a dedicated buffing machine. Another project that I have almost all the parts for, but just haven’t done it yet.

This is the tool rest I designed and built for the contact wheel on the Grizzly grinder. The tool rest is designed with an elevator to be able to move up and down by loosening a small set screw in the front to the rest. The tool rest can also rotate to form angles by loosening the socket head screw on the left side of the slotted horizontal slide bar. The slot in the slide bar allows one to move the tool rest in or out.

The only part that I have not added to the tool rest is a replaceable top plate for the rest itself, so when it gets a groove worn in it, it can be replaced without having to make a new elevator. These replacement plates will be screwed to the tool rest from bottom. In one of the above photos of my grinder, you can see the piece of metal that the slide bar slides onto. Two socket head screws secure it.

This is a second tool rest I designed to attach to the side of the platten. It allows precise angles against the platen and slides in and out to obtain different angles while maintaining a close proximity to the grinding belt. In one of the photos you can see this rest being used to precisely sand an angle on the front of a cocobolo handle slab.

This is a just a quick and dirty set-up I once used to slow down the Grizzly grinder, before I had a variable speed grinder. I just used a second 8″ contact wheel that I had in the shop attached to the buffing end of the grinder. I attached a small pulley on a motor shaft and ran a belt between the two. When I ran the motor, the belt travels at a much slower speed and gave more control for final grinding, etc. I would recommend you remove the wheel from the buffing end of the grinder when you run the main motor on it for high speed grinding; it will cause much vibration.

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