This post could go in the custom forum as well.
I recently purchased a new KMG grinder for my shop. The primary reason was wanting a variable speed grinder. I have had and used a Blademaster 2"x72"grinder for over 15 years now and love it. I'm used to it but always wished that it was variable speed. I have made a lot of my own equipment and am always looking to get the most bang for the buck in anything I do so looking at the price of the KMG I wanted was a bitter pill for me to say the least.
I shopped around and ended up buying just the KMG without a motor or variable speed drive. I purchased 2 new Baldor 2 HP 3 PH motors that I found on eBay. The seller said they were government surplus and they cost me about $190 each including shipping. If you ever checked prices on Baldors like these you know $190 is a bargian and then some. These motors had drive shafts that were 18" long so they had to be cut down for my use.
Next I found the variable speed KBAC 9520 controller I needed here
http://www.electricmotorwholesale.com/. This was the lowest price I found searching the internet. Then I purchased a 2 way knife type switch, the wire, pulleys and belts I needed. This is what I needed for my plan to use the controller I bought to send the variable speed to both motors I purchased. One for the KMG and one for my old Blademaster grinder.
I had to move another grinder I made to get the KMG where I wanted it,. The Blademater had to stay where it was.
The end result was that I converted my Blademaster to variable speed and set up the KMG as a variable speed all for less than the price of what the variable speed KMG with motor would have cost. I just have to throw the switch to the grinder I want to use. One controller and two variable speed grinders.
The variable speed is nice. I can run the belts much slower than before. It takes me longer to make mistakes now though.
I still prefer the Blademaster grinder to the KMG especially now with the variable drive. Just a matter of getting used to the new KMG I'm sure. The KMG has a 10" contact wheel as opposed to the 8" on the Blademaster so this gives me some more versatility. The Blademaster has the convenience of being able to use both the contact wheel and the flat platen without changing anything. It also has a foot pedal that releases the belt tension so you have 2 hands free to change belts. Very cool machine made in Crowley TX. I don't think the man that made these has had them in production for many years now.
I included pics of a double 12" flat disc grinder I made as well as the 2"x72" small wheel grinder I made that had to be moved. You can also see the 10" 2 wheel buffer I made to the right of the Blademaster.
I would be happy to answer any questions you might have.
Wayne Robertson