Turning a motor into a grinder.

[65535]

Hey guys, I've got my 3/4hp baldor 1725rpm motor that I want to put a 5/8" mandrel on to use a paper wheel sharpened for knives. Is there a better reasonably priced solution to this, such as a belt driven spindle. I cant seem to locate a spindle, I guess they're out o fashion. Anyways should I stick with a set screw on mandrel or can someone recommend a belt driven spindle or other option thanks.

 

[precisionworks]

I built a wire brush machine, but the arbors could just as easily hold polishing wheels.

The wire brush is belt driven by the motor mounted near the floor.

The arbor shaft is a 36" long piece of TGP shafting, threaded on each end. The shaft is supported by ball bearing pillow blocks.

The shaft drive sheave fits over a keyway on the shaft.

Not at all hard to make one like this, although I'd go with larger diameter shafting the next time. A 1.5" shaft would be about right for the 14" wheel being turned.

 

[65535]

That's a nice rig Barry, unfortunately I don't have steel laying around or the parts or a weldor. Thinking of something much simpler and smaller, probably run 10" wheel max with very little load, power strolling knives basically.

 

[precisionworks]

Try a Google search for "ball bearing arbor" or "ball bearing mandrel" and you'll find quite a few starting around $50 and going up to $250 ... like these:

http://www.grainger.com/Grainger/DAYTON-Heavy-Duty-Ball-Bearing-Mandrel-6L098?Pid=search

http://www.grainger.com/Grainger/DAYTON-Heavy-Duty-Ball-Bearing-Mandrel-6L099?Pid=search

Pretty close to what I made, on a smaller scale.

 

[65535]

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370421115073&ssPageName=STRK:MEBIDX:IT

I found this guy, which I believe is a belt drive spindle, but could be a complete grinder, hard to find info on. Anyways it should be perfect for the application once the guards are removed.

No body here buy it please.