SirRoxalot
freely admits to licking rocks
Member since October 2003
Posts: 790
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Post by SirRoxalot on Jul 22, 2008 9:27:33 GMT -5
So now I've got it in my head to build a decent sized rotary flat lap, using magnetic diamond laps. No centre hole, and at least 12" across. Couple questions for the old pros out there:
What's the name of the bearing I should use to keep the shaft vertical? Run straight off the motor or use pulleys and a separate shaft - speed to run? How to keep runoff from the lap out of the shaft bearing and the motor???
Anything else I need to worry about?
Thanks a bunch for any help!
SirRoxalot
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Post by Woodyrock on Jul 22, 2008 18:39:01 GMT -5
Have a look at my reply to rotating flat lap for the photographs of my machine. I did not build this, a local machine shop did. The photographs should give you some ideas.. The flat plate on my unit is twenty inches in diameter. If you have questions about this machine, just ask. Woody
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Post by johnjsgems on Jul 22, 2008 23:24:38 GMT -5
If you use a belt drive you could use either "pillow block" bearings or "flange mount" bearings depending on frame design. Ball bearings will cost a lot but outlast sleeve type bearings by years. The lap plate would need to be enclosed underneath and a splash shield around the side. The old type flat laps using grit didn't use much water and low speed was a must. With the diamond laps you will need to use enough water to keep the diamonds cool and rock dust down.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Jul 24, 2008 15:33:46 GMT -5
I used pillow block bearings on mine and built a splash guard/tray out of a five gallon bucket. I turned the bucket upside down and used a heat gun to make the bottom droop down so that when the bucket is the right way up there is a like a cone shape on the bottom. I then cut a hole big enough for the shaft in the top of the cone and set it on.
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