tgotch
off to a rocking start
Member since October 2011
Posts: 6
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Post by tgotch on Nov 1, 2011 18:44:51 GMT -5
I am in the process of designing/building a flat lap (in addition to the grinder in another thread)
I will be grinding and sanding glass bottle rims on the flat lap.
I am new to this hobby, and completely confused on what I should use for this.
Details: bottle rims will be anywhere from 2" to nearly 4" diameter. Some bottles may be odd shapes (oblong, oval, etc.) so possibly nearly 6" long.
I have looked at 6" discs, 8" discs, and possibly 12"discs.
It seems as though all the 6" and 8" are mounted to the shaft with an arbor/hole. Are there any of these that are full surface pads?
If I go with 12" where do I find backing plates? Do I need to have one fabricated, or are the suppliers that have this (can't find any to date)
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Post by jakesrocks on Nov 1, 2011 19:35:45 GMT -5
Covington makes aluminum disks that will thread right on an arbor in 6", 8" and 10" sizes. I have a very old 12" disk, but don't want to part with it.
Also disks with a 1/4" 20 bolt on the back are made with no center hole in 4" and 6" sizes to take either glue on or magnetic diamond disks. The end of your arbor has to be center drilled and threaded to 1/4" 20 to accept them. You can get them in right and left hand thread, so both ends of an arbor can be used.
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tgotch
off to a rocking start
Member since October 2011
Posts: 6
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Post by tgotch on Nov 1, 2011 19:59:05 GMT -5
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Post by jakesrocks on Nov 1, 2011 20:34:16 GMT -5
It probably would. I'd want to know what size arbor it fits on first. If you plan to run the disc horizontal, you'll need an arbor that's designed to run horizontal also. Some older washing machine motors are great for flat lap use also. They were designed with thrust washers, so they can be run upright instead of horizontal.
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tgotch
off to a rocking start
Member since October 2011
Posts: 6
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Post by tgotch on Nov 1, 2011 20:49:52 GMT -5
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Post by johnjsgems on Nov 2, 2011 9:07:49 GMT -5
I would price diamond laps before buying a backer. 12" laps will be pricey. You can make an old style rotating lap with a steel lap plate and use silicon carbide grit. It would have to turn very slow. Seems like they ran at about 600 rpm.
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