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dial indicator help
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<blockquote data-quote="Trickymissfit" data-source="post: 495193" data-attributes="member: 25383"><p>I tried to post a couple pictures of my front shooting rests a couple days ago, but so far can't get nothing to work right. Can anybody here help an old guy thru the procedure?</p><p> </p><p>Machine scrapeing is a black art! No two guys do it the same, and after working with many guys over time I can look at the pattern and almost tell you who did it! It's hard work, and not very rewarding. I learned to scrape from old Dutchmen and Germans. These guys were extremely picky about work quality, and would often refer to another's work as "chicken scratches!" Later I worked with a couple others that were pretty good, and learned from them. I think my greatest advancement in the use of the idiot stick was when I started mastering surface plates and strait edges. I learned to develope patterns and how to cheat. It very hard to find two guys that can scrape together, as they both must cut about the same amount of metal in a pass (about .000030"). Norm and I were very similar, but our patterns were not quite the same. My dots were football shaped, and Norm never quite got that part. Not a big deal unless your cutting plates. I also read the dots like the old men did, and Norm never quite figured that part out (takes many years to learn). But Norm was the only guy I would scrape with, and I was the only guy he trusted. I used to make Norm extremely nervous when I drug out the electric scrapers! (he later relented) I remember ontime we had to rescrape a Devlieg Jig Mill that somebody had really screwed up. The "W" axis was out over .0065". I was laying on the electric scraper pretty hard, and the cast iron was comming off smoking. I knew I was taking about .00075" a pass, and was cutting it in layers to get it down to less than .001". The boy was on Malox by the time I made my third pass <g>!! The table had to be cut under one tenth parrallelism, and I had a long way to go. I had it parallel by the middle of the second day, and was done in four days. Right in the middle of the first day I jumped on the boss's scooter and went after my cigar box of stones (recycled thread grinding wheels). He looked at me with a lot skepticism, and I just laughed. The job actually took about a half day longer because somebody rubbed their fingers over the area I was scraping (the old men would have boxed his ears or at least smacked his fingers with a scraper). When they do this it leaves a glaze, and the metal dosn't cut the same. As for photgraphs of my work; there are none that can be published. TACOM has some in their files. And even with a photograph you couldn't tell much, but the idicator and autocollumator never lie! I do have an old book at the house that really goes in to detail, but the equipment is old and kinda crude</p><p> </p><p>I never had to worry about loosing a job much with the ability to scrape in a set of ways on a machine. Nobody wanted to learn to do it as it was hard work and kinda dirty. Yet I enjoyed it. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 495193, member: 25383"] I tried to post a couple pictures of my front shooting rests a couple days ago, but so far can't get nothing to work right. Can anybody here help an old guy thru the procedure? Machine scrapeing is a black art! No two guys do it the same, and after working with many guys over time I can look at the pattern and almost tell you who did it! It's hard work, and not very rewarding. I learned to scrape from old Dutchmen and Germans. These guys were extremely picky about work quality, and would often refer to another's work as "chicken scratches!" Later I worked with a couple others that were pretty good, and learned from them. I think my greatest advancement in the use of the idiot stick was when I started mastering surface plates and strait edges. I learned to develope patterns and how to cheat. It very hard to find two guys that can scrape together, as they both must cut about the same amount of metal in a pass (about .000030"). Norm and I were very similar, but our patterns were not quite the same. My dots were football shaped, and Norm never quite got that part. Not a big deal unless your cutting plates. I also read the dots like the old men did, and Norm never quite figured that part out (takes many years to learn). But Norm was the only guy I would scrape with, and I was the only guy he trusted. I used to make Norm extremely nervous when I drug out the electric scrapers! (he later relented) I remember ontime we had to rescrape a Devlieg Jig Mill that somebody had really screwed up. The "W" axis was out over .0065". I was laying on the electric scraper pretty hard, and the cast iron was comming off smoking. I knew I was taking about .00075" a pass, and was cutting it in layers to get it down to less than .001". The boy was on Malox by the time I made my third pass <g>!! The table had to be cut under one tenth parrallelism, and I had a long way to go. I had it parallel by the middle of the second day, and was done in four days. Right in the middle of the first day I jumped on the boss's scooter and went after my cigar box of stones (recycled thread grinding wheels). He looked at me with a lot skepticism, and I just laughed. The job actually took about a half day longer because somebody rubbed their fingers over the area I was scraping (the old men would have boxed his ears or at least smacked his fingers with a scraper). When they do this it leaves a glaze, and the metal dosn't cut the same. As for photgraphs of my work; there are none that can be published. TACOM has some in their files. And even with a photograph you couldn't tell much, but the idicator and autocollumator never lie! I do have an old book at the house that really goes in to detail, but the equipment is old and kinda crude I never had to worry about loosing a job much with the ability to scrape in a set of ways on a machine. Nobody wanted to learn to do it as it was hard work and kinda dirty. Yet I enjoyed it. gary [/QUOTE]
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