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Further developments Thanks to all who have stopped by to view this little project. It has been very satisfying to put together. I think I've sharpened every knife and tool in the house with this thing - it's so quick and easy. I'm looking forward to making more knives. I've added a stand...

I"m sure glad to hear that it's TV that adds 20 pounds - I was afraid that it was cheeseburgers. :biggrin:

Here's Bruce's first blade ground on the big wheel:

Video!!! Here's Bruce and his big machine: http://www.youtube.com/watch?v=Wfqfhw2wnhc&feature=youtu.be

Thanks everybody for the comments. I especially appreciate critiques and suggestions. My plan for the platen includes 3/16" ceramic glass for a top surface. When it's in place, the wooden spacer that shows in the last picture will be removed.

Platen Here are a couple of pictures of the flat platen attachment. I epoxied a 6 x 2 x 3/16 steel bar to a wood block shaped to fit over the contact wheel. The front portion can be removed if I need to make a change. The wooden spacer is temporary until I get the ceramic platen cemented...

Thanks, Laurence, now you've got my wheels turning on how to make that work. I'd have to slip off the 10" wheel and bolt on the platen assembly in its place.

Thanks everyone for the kind words. This has been a fun project. I guessed at the tension by holding belt at about the angle it would have as it passed over the tracking wheel and set a pair of my wife's 10# dumbbells on it (no comment on her 180# dumbbell :3: ). It seemed about right, so I...

Nearly complete Here’s the finished grinder after painting and cleaning up the wiring. I still need to add a flat platen, devise a tool rest and build a stand for it. I’ll post pictures of those as I get them done. The three holes are for attaching the flat platen. I made a wooden cover...

Further progress These show the arm that holds the tracking wheel. It’s a piece of oak pivoting on a ½” bolt that runs through a pair of metal brackets bolted to the support. This 20 lb. gas spring tensions the belt. I assembled it and temporarily wired it to test run it. The front...

After seeing how useful and versatile the belt grinders are in Bruce Bump’s shop, I knew I “needed” one too. Ready-made was way out of my budget, so I set out to see what I could build. I wanted a variable-speed motor, so after some research I purchased a 2HP 3-phase motor that turned at 1725...

No sech thing as simple arithmatic!

This machine has a 1HP DC motor with a variable speed drive, so starting out slow will be easy. We're just trying to guess what the top speed should be.

The 14" wheel has a 3.66 ft circumference; the 24" wheel has a 6.28 ft circumference. If presently you're driving that 14" wheel with a 1700 rpm motor using a 2" drive pulley and a 4" driven pulley, that works out to be 3111 ft/min. 1700 x 2/4 x 3.66 = 3111 Switching to the 24" wheel; if you...

Do you really grind at that speed? that's over 5000 feet per minute, or 57MPH. If it flies off, you'll get a speeding ticket :les:. Put another way, that speed would create about 220-g's of force - each pound of rubber on that rim would be pulling away from the center with about 220lbs of force.

Naww nothing serious. She can still do most everything without a left index finger.:3: Not really, just a scratch. This Elmax knife is astoundingly sharp. I've worked with and sharpened lots of cutting tools but the only things that come close to being this sharp are some of my Japanese...

So pleased with my new Claude Scott sheath. the workmanship is just impeccable!

Thanks, Erik - I'm thinking of Bruce telling me to hold the blank steady against the wheel - "Don't be going spastic on me, keep it in the groove!" I sharpened it and tested it on onions and peppers this evening. My wife tried it too - I glued the slice in her finger back together with...

Thanks, I think I'm hooked!

Thanks Brad, I've really come to appreciate the skills that you guys, who do more than just grind away some steel like I did, have developed.