"How to get perfect 24" hollow grinds in a box" just arrived

Stacy E. Apelt - Bladesmith

Stacy E. Apelt - Bladesmith

ilmarinen - MODERATOR
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Knifemaker / Craftsman / Service Provider
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This box just showed up. The UPS guy said he had a heavy box on the truck and did I want him to take it to my van. I knew what it was. The photos show the box from Noritake, and the contents. It is a 180 grit 24"X2" wheel. I have a large wet grinder in the works that will take several different type of wheels with a 10" arbor hole. One is for flat lapping on the side of the wheel, one for coarse grinding, and this one is for the finish and hollow grinding.

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I have a line on a 4" wide wheel that fits the same hub.
 

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Found a fellow who liquidates industrial surplus on ebay. He still has one left ... I'll PM you the link.

These type wheels come up regularly on ebay for really cheap prices. I bought one for $3.99 and paid $30 to ship it. This one was $89 with $12.50 UPS shipping. I think they are somewhere around $300-$500 from a supplier.
 
NICE!!!! Ive always thought it would be cool to grind with a large stone.
How do you mount it though? and what RPM? ~100ish?
 
There is a 10" hub it gets mounted on. They run as slow/fast as you want, but 100-200RPM is a good range. With a VFD and a large/small pulley setup, the range is typically 60-300RPM. On a 24" wheel that is roughly 350-1500SFM.
 
Ha. Good luck. I had two such wheels sitting around for years after our factory relocated. Eventually sold them on ebay. Got £0.99 for one and £1.50 for the other. The latter was a Norton vitreous ceramic abrasive wheel, price from a supplier £400.
 
I have all the parts sitting in a box. Gear reduction motor and VFD running a 2" shaft. The hub parts are in another box. The whole assembly will be turned to make a 10" hub and a 16" rim. I will make another 16" rim to clamp the whole thing on the shaft.
 
Cool, I wonder what kind of wear you can expect?
 
Honestly, with the low hours of use a small knife shop will give it, it will probably outlive me.
 
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