Some question's for you guys about a belt grinder...

T

ThirdEdge97

Joined
Feb 8, 2013
Messages
105
Hey guys, I'm going to be building a belt grinder soon and i have been getting my plan ready, i was watching Bruce Cheaney make a knife and from setting the bevel on his knives he uses a contact wheel with a rest and it seemed like it made it super easy to keep the bevel uniform.

so i'm wondering what you all think, would a rest be a good thing to have?

also, i would like your guys opinions on this build of grinder; http://www.youtube.com/watch?v=L8ss_PZDWP0
looking at this build it looks like to me it use's alot less metal than the No weld grinders.

i have access to a welder and basically everything else i will need to make this design, i also have access to scrap metal and whatnot to build this grinder at low cost.

if someone would give me a little bit of advice that would be spectacular!
 
Didn't see the video but yes for sure on the tool rest. and make one that's adjustable
 
I'd say the same as Brett.

He's using a pretty small drive wheel for a 1725 motor. It probably yields under 3000 sfpm. Good for learning, maybe later you'll want to put a variable speed setup with a 4" or so drive wheel in there instead.

The no weld grinder has really a lot of tubing in it, mainly because it was designed to bolt and clamp together. Welding opens up a new simplicity of design, as evidenced by that grinder in the vid. Just tack everything up nice and square and check it before welding- you want the frame well aligned.
 
No, I think direct drive is best for variable speed grinders. Less chance of vibration, less parts to buy.
 
No, one size drive wheel, a 3 phase motor, and a VFD is a better option. V-belt and pulleys is better than several drive wheels.

A surplus or used 2 hp 3 ph motor can often be had for less than $100 in many places, including ebay. A TECO FM50 202C VFD will cost you about $150.
 
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