Mounting white oxide wheels on an arbor

C

Chucketn

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I’m building a belt driven arbor for two white aluminum oxide wheels. The arbor will have a 1/2 “ shaft in ball bearing pillow blocks. The wheels have a 7/16”mounting hole. I will turn 7/16” x 20 tpi., left and right hand threads on the shaft. My current dilemma is how to make the cup washers for the wheels. I have some 6061 aluminum bar ends, will that be sufficient? I plan to face the end, and cut a relief about 1/16” deep for ½ the diameter, leaving a face at the inner and outer diameters, and part off at 3/16” thick. I will then mount the washers on an arbor and face the other side. What do you all think?
Chuck
 
On the cup side of the washer, I'd take the shoulder completely off the inner diameter of your 1/16' cut. Leave about 1/4 to 3/16 of material around the outer part of the washer. This way it'll be supported on the outer part of the washer which is what you want. Aluminum is weaker than steel so if you can make the washers thicker i'd make them 5/16 at there thickest. You didnt say what diameter your washers will be but that will have an effect on the amount of flex you get on the cup washers. You want the inner washer can be straight with no cup, and put the cup just on the outer washer. This way the grinding wheel will locate itself against the inner washer solid. You not gonna have much of a seat on the shaft. Thats only a 1/32" seat around the radius of that shaft for your washer to seat to. That might not be so good with an aluminum washer. I'd go with a bigger shaft like 3/4". That shoulder is what locates the inner washer and ultimately the grinding wheel. You could weld an inner washer to the the shaft and then face it but that aint the greatest. The heat can distort your shaft.
 
Aluminum will be fine as long as you make the washers thick enough that they don't cave in when you tighten the arbor nut. Make sure you also have the blotting paper washers on the wheels,too,so the wheels are protected from cracking when the washers are tightened. The paper washers spread out the pressure on the wheels. If you have to make the paper washers,use the gray cardboard back of a note book,or some cardboard of similar thickness,at least 1/32" thick.
 
Thanks, George and Marcel. Got very little info on the other forums I'm on.
Got the washers turned, next is the arbor. Photos when all parts are done and ready for assembly.
The wheels have blotter paper labels on them, but I will make up spares also.
I still need to find a diamond dresser as I don't own one yet.
I had made a short single ended arbor for finishing the washers, and put one of the wheels on it to see how true it spun. I did not spin it up full speed, just slowly to get an idea of trueness. Definitly need a diamond dresser...

Chuck
 
Just make sure that inner shoulder on the shaft has enough meat on it to firmly locate that inner washer. You could always try backing it with a nut, but my experience with that setup is that the wheel wont run true. A good shoulder is better.
 
Hold the diamond dresser in a small downwards tilt when dressing. Otherwise,the diamond can get fractured.
 
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