allan
off to a rocking start
Member since May 2017
Posts: 4
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Post by allan on May 16, 2017 2:56:46 GMT -5
Hello,
Thank you very much for your time and acceptance into this group, which was recommended to me by a fellow hobbyist in Utah. While I have been gathering rocks for some time, I am just beginning to get into cutting and cabbing. Getting an old HP grinder running and would very much appreciate help with one of the final components. I have an 8" domed aluminum lap on the end of the machine with a 3/4" arbor extending all the way through. I would like to replace it with or convert it to a flat lap (preferably steel so I can use the magnetic laps), but haven't found a way to do this yet. Any suggestions would be appreciated.
Some possible ideas, would be to drill and tap the arbor itself so it could take the 1/4"-20 bolt, but I don't know if this would work (or be wise). Others have suggested having a machine shop flatten the domed aluminum arbor, but I don't know how that would be done; or drill and tap it, but that won't work because it is hollowing the center.
Any help or suggestions would be greatly appreciated.
p.s. I tried to upload a very small picture, but got an error that the forum has surpassed its limit.
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Post by woodman on May 16, 2017 13:45:26 GMT -5
Hello, Thank you very much for your time and acceptance into this group, which was recommended to me by a fellow hobbyist in Utah. While I have been gathering rocks for some time, I am just beginning to get into cutting and cabbing. Getting an old HP grinder running and would very much appreciate help with one of the final components. I have an 8" domed aluminum lap on the end of the machine with a 3/4" arbor extending all the way through. I would like to replace it with or convert it to a flat lap (preferably steel so I can use the magnetic laps), but haven't found a way to do this yet. Any suggestions would be appreciated. Some possible ideas, would be to drill and tap the arbor itself so it could take the 1/4"-20 bolt, but I don't know if this would work (or be wise). Others have suggested having a machine shop flatten the domed aluminum arbor, but I don't know how that would be done; or drill and tap it, but that won't work because it is hollowing the center. Any help or suggestions would be greatly appreciated. p.s. I tried to upload a very small picture, but got an error that the forum has surpassed its limit. I upload my photos to photobucket then use the direct link to post them here. Welcome to the group.
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allan
off to a rocking start
Member since May 2017
Posts: 4
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Post by allan on May 18, 2017 19:24:39 GMT -5
Thank you, I will have to do that next time. I ended up going a different direction with this project. I ended up abandoning the search for a flat lap that would fit after learning that domed ones would be preferred for polishing cabs (vs. flat ones for the back sides or flat surfaces). I am very new to this, so I apologize for my confusion. I eventually found an adaptor to convert the 3/4" smooth arbor to the 1/4"-20 thread bolt so I can use the Standard Nova Disc, as well as polishing pads (felt, leather, etc.). The disks are smaller (5.5" vs 8"), but I believe they should still work okay. I also still have the original leather domed one, which has some foam padding under the leather. Whomever had it before used some type of adhesive to attach the leather, and wrapped a wire around the edge. Is this sufficient and safe?
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