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Issue Building a 2x72 belt grinder


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I'm building a basic 2x72 KMG-Style belt grinder.  I was able to pick up a couple of contact wheels (6" and 8") for a decent price, but I immediately discovered that the bearing center hole is 30mm (1.18").  My plan was to use a 3 in. bolt for a shaft bolted into the 1.75x1.75 box steel tool arm.  The problem I have is that I can't find any 30mm dia. bolts locally, and even if I did, that's a HUGE bolt and I don't even have a 30mm drill bit anyway.

 

Any suggestions on how to use these contact wheels?

 

Big Bill

Edited by Big Bill
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If you have a friend with a lathe he can make you a bushing. If you don't know someone, a local machine shop might do it, but it may be expensive. 

Edited by Bill Kirkley
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Try to find a bearing with the OD you need and the ID you want.

This is sometimes easier said than done though.

Edited by Jeremy Blohm
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On 12/24/2018 at 11:15 AM, Big Bill said:

I'm building a basic 2x72 KMG-Style belt grinder.  I was able to pick up a couple of contact wheels (6" and 8") for a decent price, but I immediately discovered that the bearing center hole is 30mm (1.18").  My plan was to use a 3 in. bolt for a shaft bolted into the 1.75x1.75 box steel tool arm.  The problem I have is that I can't find any 30mm dia. bolts locally, and even if I did, that's a HUGE bolt and I don't even have a 30mm drill bit anyway.

 

Any suggestions on how to use these contact wheels?

 

Big Bill

I ran into the same issue a while back.  I went to a local machine shop and had them turn a stub of bar stock down to press fit into the 30 mm bore...then drilled out the stub for a 5/8" dia bolt

Edited by JeffM
spelling correction
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Hi Bill

Not 100% sure but of the hole is 30mm I would assume that's to accommodate bearings?

....and then the bolt goes through the bearings.

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Gerhard

Sorry for the late reply.  I assumed his wheel came with a press fit bearing with an ID of 30mm. If not he would need to get a bearing to fit his wheels ID of 30mm. 

If that's the case he may find a bearing with an ID to fit a bolt he can drill a hole for. 

Edited by Bill Kirkley
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  • 6 months later...

Late update.

My uncle (Alstar Knives) gave me an 8 inch contact wheel that already had a bearing with a 5/8" ID and I've been using it.  The other 2 contact wheels with the 30mm id bearings are still sitting on a shelf.  The 2x72 belt grinder is doing very well!.  Except for when it caught my glove and pulled my hand between the belt and the wheel, breaking my thumb.  That put a kink in my guitar playing and thumb wrestling for a couple of months.  I cranked out a couple knives for myself recently and then a young man (17) wanted me to help him make his own knife, so we cranked that one out.  It was his own design.  He wanted the handle with African Black Wood and olive wood.  It looks good.

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Edited by Big Bill
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50 minutes ago, Big Bill said:

Except for when it caught my glove and pulled my hand between the belt and the wheel, breaking my thumb

This is why I always grind barehanded. But that said everything is looking good!!!

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