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Rifles, Reloading, Optics, Equipment
Gunsmithing
dial indicator help
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<blockquote data-quote="Trickymissfit" data-source="post: 494569" data-attributes="member: 25383"><p>I've got two or three 50 millionth indicators, and used them a lot for setting of bearing packs on machine centers. It all started out with a scrape job I did on a Heald internal grinder, and we were using a pair of .0001" indicators to check our work. The Heald used a V and a flat in the bed, and it looked like Norm and I had it within .00025" in about 48". But I knew that the relationship between the flat and the v had to be very close or the machine would wear out quickly. Yet I didn't know how to check this for sure (I had an idea, and it turned out I was correct for a change). Well I knew one guy that knew how to do this check, but he was also a pain. We go see him and asked him just what was good enough. He came over and had a look see, and comes back with some indicators and a home built gauge.</p><p>The indicator was a .000050" Federal, and he did the checks for us. He said "it would be good enough this time!" I'd never seen a .000050" indicator before, and he said it was what you need to do it right. Turned out he was pulling my leg and the grinder was near perfect. Thru the years Norm and I worked together scraping machines and other things, and when we wanted to put the other on the jack up we'd give the other a 50 millionth indicator to use!</p><p> </p><p> The .000020th indicators are used to calibrate surface plates. They usually have a ruby tip, and don't come cheap. I gave the ones I had away, as I hoped to never work that close again</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 494569, member: 25383"] I've got two or three 50 millionth indicators, and used them a lot for setting of bearing packs on machine centers. It all started out with a scrape job I did on a Heald internal grinder, and we were using a pair of .0001" indicators to check our work. The Heald used a V and a flat in the bed, and it looked like Norm and I had it within .00025" in about 48". But I knew that the relationship between the flat and the v had to be very close or the machine would wear out quickly. Yet I didn't know how to check this for sure (I had an idea, and it turned out I was correct for a change). Well I knew one guy that knew how to do this check, but he was also a pain. We go see him and asked him just what was good enough. He came over and had a look see, and comes back with some indicators and a home built gauge. The indicator was a .000050" Federal, and he did the checks for us. He said "it would be good enough this time!" I'd never seen a .000050" indicator before, and he said it was what you need to do it right. Turned out he was pulling my leg and the grinder was near perfect. Thru the years Norm and I worked together scraping machines and other things, and when we wanted to put the other on the jack up we'd give the other a 50 millionth indicator to use! The .000020th indicators are used to calibrate surface plates. They usually have a ruby tip, and don't come cheap. I gave the ones I had away, as I hoped to never work that close again gary [/QUOTE]
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dial indicator help
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