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| Repeat-o-meter |
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| vtsteam:
Looks very nice Matt! :beer: One thing I missed seeing in the video is the Repeat-O-Meter in use on the surface plate you wanted to check with it at the start. How is it used, and was the plate flat? Also..... sorry I'm not familiar with this tool..... if the balls are pressed in, how does the gauge end move up and down? Wasn't there a ball under that one? And if the two stabilizer bars on the side are loose, what do they do -- or do you tighten them up? I'm sure there are answers to all this, once you own one. But your video is the only thing I know about it! :clap: :clap: |
| mattinker:
--- Quote from: vtsteam on June 29, 2017, 08:48:11 AM ---Looks very nice Matt! :beer: One thing I missed seeing in the video is the Repeat-O-Meter in use on the surface plate you wanted to check with it at the start. How is it used, and was the plate flat? i hadn't tried it when I filmed it, i thought I'do a video of mapping out the plate to follow! Also..... sorry I'm not familiar with this tool..... if the balls are pressed in, how does the gauge end move up and down? Wasn't there a ball under that one? And if the two stabilizer bars on the side are loose, what do they do -- or do you tighten them up? The steel balls are pressed in and then ground flat, I finished them with wet 'n dry abrasive paper, once the balls were nice and smooth, I made a flexion by drilling a hole close to the bottom edge and slitting from the top down into the hole, leaving 1.2mm+/- so that the single ball/foot under the dial gauge can move up and down (within the elastic limit of the flexion!) whilst the three that remain under the mass of the body sit on a flat area of the surface plate. Them two "floppy" bars on the side are there to stop the lower front bar from "drooping" as there's nothing there to support it but the flexion. I think that these are more of a safety feature than anything else! I included a link to a Tom Lipton video that explains the us of the Repeat-o-meter I'm sure there are answers to all this, once you own one. But your video is the only thing I know about it! :clap: :clap: --- End quote --- More coming, regards, Matthew |
| vtsteam:
Thanks Matt! So the ball under the gauge is not pressed into place like the others, but is free to move up and down? And the side bars effectively put a limit on the upper and lower range of movement of the indicator -- hope I have that right? |
| mattinker:
--- Quote from: vtsteam on June 29, 2017, 10:13:50 AM ---Thanks Matt! So the ball under the gauge is not pressed into place like the others, but is free to move up and down? And the side bars effectively put a limit on the upper and lower range of movement of the indicator -- hope I have that right. --- End quote --- Nope! All four balls are pressed in, there is a flexion that is situated next to the two central balls, this allows the 20 x 50mm bar to bend near the middle, three of the balls under the heavy end provide a reference point, the remaining ball is under the dial gauge indicator. The side bars are there to stop the flexion bending too much and going beyond it's elastic limit! Regards, Matthew |
| PekkaNF:
Nope, the upper part is (semi) rigid beam, that screw disc is only for adjustment. The lower body is split half - there is a flexure (hole cut free from other side). All balls are rigidly attached. Three balls support the back of the meter and this "beam" on the top. Front part is sort of tailgate, this flexure allows it to follow countour of the surface plate. Those loosely attached arms on the side work exactly the same way that tail gate keepers on pick-up truck. Prevent that part from dropping down when the instrument is lifted. Purpose of the balls is to give a defined contact, when flat is not flat enough - you can describe a plane with three points, then you fourth somewhere and indicate how much it it is different. Hope this helps, Pekka *Nope, was to VT---- :lol: Matthew beat me just narrowly :wave: |
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