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dial indicator help
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<blockquote data-quote="Trickymissfit" data-source="post: 494857" data-attributes="member: 25383"><p>I guess I'm 3/4 nuts, because I enjoy working close. I actually wore out .0001" indicators, and destroyed more than one as well. That's how I came into the first Interrapid. I had a new Federal setup on a VTL adjusting the backlash out of the screw & nut. My boss came up and said to let him see where I was at. He pulled the wrong lever and made the indicator about as thick as a dime! He laughed and said he'd get me another one asap. About a week later he hands me a new Interrapid. I was ruined! I now own four or five of them.</p><p> </p><p>I think a lot of folks tend to make a mountain out of a mole hill. If you see movement in the dial you can always take it out till there virtually no movement. Then do a check with a finer indicator. Working close is scarey to a lot of folks, but it's just a mental frame of mind. You learn to remove as many variables as possible, and the rest will fall in place. When I cut surface plates the spec was .000025" error per foot. Sounds frightening, but with the correct piece of equipment it's not all that bad. Getting one flat was easy, but getting one area to repeat with another area was often a pain in the rear. I've gotten surface plates so flat and smooth that you couldn't check them with a laser, and would have to go back over them with a piece of Scotchbrite to break the glaze. </p><p> </p><p>Many years back I was handed the job of scraping in a Brown & Sharpe universal gauge grinder. The table was about 90" long, but the width of the V & flat were very narrow. You could not use a standard width strait edge to master it off of. Nothing was easy except for the quality of the cast iron they used. The bed was not ever planed right from the factory, and the pad the wheel head mounted on was a little over .03" out of parallel. Norm and I scraped on that thing till we were blue in the face. I actually burnt up a Bix electric scraper! When we finally got it to where we thought it was kinda close (about .0004" in 90") the guy that ran it dropped by to see how we were comming along (we'd been cutting on this thing for about a month). Told me that it had to ground round within .000010"!!! I was ready for Malox!! Norm went upstairs to the restroom and puked. Then this guy I knew from Gleason came buy, and said he knew about that grinder. They assembled it for B&S when they were down. He said the bed was not planed right (I knew that the wheel head mount wasn't already), and told me to measure the center line of the V to the flat before I went any further (we were about 85% done). The flat was .120" too high!!! The machine is junk as far as I'm concerned, and it also has to grind within 10 millions of being round. It would take months to bring the flat down to where it needed to be. Norm is sure we're as good as unemployed, and goes back upstairs for another upchuck. I call a high level meeting and dropped the hammer on them. Boss wants to seal up the bed and send it out to Viking Engineering to replane the bed. His boss won't let him, and the tool room needs the grinder. So we put it together, and gave it back to them. They loved it (??).</p><p>But in six months it needed to be rescraped. If they'd replaned the bed and then scraped it back in the machine would have ran for twenty years without being touched.</p><p> </p><p>I might add that I lost about 15lb. on the scrape job!</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 494857, member: 25383"] I guess I'm 3/4 nuts, because I enjoy working close. I actually wore out .0001" indicators, and destroyed more than one as well. That's how I came into the first Interrapid. I had a new Federal setup on a VTL adjusting the backlash out of the screw & nut. My boss came up and said to let him see where I was at. He pulled the wrong lever and made the indicator about as thick as a dime! He laughed and said he'd get me another one asap. About a week later he hands me a new Interrapid. I was ruined! I now own four or five of them. I think a lot of folks tend to make a mountain out of a mole hill. If you see movement in the dial you can always take it out till there virtually no movement. Then do a check with a finer indicator. Working close is scarey to a lot of folks, but it's just a mental frame of mind. You learn to remove as many variables as possible, and the rest will fall in place. When I cut surface plates the spec was .000025" error per foot. Sounds frightening, but with the correct piece of equipment it's not all that bad. Getting one flat was easy, but getting one area to repeat with another area was often a pain in the rear. I've gotten surface plates so flat and smooth that you couldn't check them with a laser, and would have to go back over them with a piece of Scotchbrite to break the glaze. Many years back I was handed the job of scraping in a Brown & Sharpe universal gauge grinder. The table was about 90" long, but the width of the V & flat were very narrow. You could not use a standard width strait edge to master it off of. Nothing was easy except for the quality of the cast iron they used. The bed was not ever planed right from the factory, and the pad the wheel head mounted on was a little over .03" out of parallel. Norm and I scraped on that thing till we were blue in the face. I actually burnt up a Bix electric scraper! When we finally got it to where we thought it was kinda close (about .0004" in 90") the guy that ran it dropped by to see how we were comming along (we'd been cutting on this thing for about a month). Told me that it had to ground round within .000010"!!! I was ready for Malox!! Norm went upstairs to the restroom and puked. Then this guy I knew from Gleason came buy, and said he knew about that grinder. They assembled it for B&S when they were down. He said the bed was not planed right (I knew that the wheel head mount wasn't already), and told me to measure the center line of the V to the flat before I went any further (we were about 85% done). The flat was .120" too high!!! The machine is junk as far as I'm concerned, and it also has to grind within 10 millions of being round. It would take months to bring the flat down to where it needed to be. Norm is sure we're as good as unemployed, and goes back upstairs for another upchuck. I call a high level meeting and dropped the hammer on them. Boss wants to seal up the bed and send it out to Viking Engineering to replane the bed. His boss won't let him, and the tool room needs the grinder. So we put it together, and gave it back to them. They loved it (??). But in six months it needed to be rescraped. If they'd replaned the bed and then scraped it back in the machine would have ran for twenty years without being touched. I might add that I lost about 15lb. on the scrape job! gary [/QUOTE]
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