2 X 48 Belt Grinder (again)

rwm said:
Mark-the top pulley is crowned about 1.5 deg on each side. Hard to see.
I loosened the pivot bolt for the upper arm slightly and this seems to have fixed the problem somehow. It doesn't make sense since it now theoretically has a little more slop. Anyway, it tracks true!
Robert
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That is great. I know you need one pulley crowned. I don't guess it matters which one. It could have been the upper arm was binding slightly and couldn't move as it needed, but it is great it works better now.
 
In Follow Up:
This grinder is working great at the speed I chose. Now that I have some run time on it I am very happy and it is now one of the most useful tools in my shop. It is super easy to change belts and the dust collection works well.

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Robert
 
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I have a 1" belt grinder , a little metal protractor , screwed to the side with a floating pointer will help with the table angle to the face of the belt. Just offering my little add-on.
 
Interesting. I assume you mean behind the platten? I could do that.
Robert
 
good looking grinder, well detailed build

I bought a Jancy RadiusMaster, 2" x 48" belt grinder/grinder, 3600 fpm, probably the most used tool in the shop. I use the Carborundum 50 grit, CBN based grit.
 
Actually, won't work. My table slides for and aft to adjust the gap to the belt. with the pivot point changing any protractor would be off. The only way I can see to do it is actually kind of cool. I need a magnetic protractor used to set table saws. They read gravity. I could mount one under the table. Christmas present?!
Robert
 
I am reviving this old thread to ask a relevant question about bearings. I used two RS 1621 bearings on the upper pulley. Based on my calculations, that pulley turns at almost 9000 rpm. I have already had one set of bearings fail (squealing.) I replaced them with BL bearings "Meets ABEC 1-9, AFBMA and ISO Standards." I cannot seem to find bearings rated over 5000 rpm. I know other grinder designs run at similar speeds. Am I going to continue to have repeated bearing failures? Is there a better option for this pulley?
Robert
 
No takers on this question?! It looks to me like I need to rebuild the upper pulley to accommodate a different series of bearing. Some of the metric series are rated much higher. Seems like the 1600 series was a design flaw (by me.)
Robert
 
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