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Impressive $20 brake rotor for tramming the mill

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  • #91
    do, can't say I've ever done it but there were a couple of people at the start of this thread that claimed to do it. There are also quite a few people that think .001 is a really tight tolerance.

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    • #92
      Originally posted by gnm109
      JB Weld!!! Thumbs up!

      If I ever build my dream home, the kitchen will have several taps.

      1. Hot water.
      2. Cold Water.
      3. Ketchup.
      4. Skippy Peanut Butter.
      5. Heinz Ketchup.
      6. JB Weld
      7. JB Weld Hardener.
      8. Beer.
      9. Hand Cleaner

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      • #93
        I would always laugh at machinist making a 20 inch sweep on a bridgeport mill. Gee does the quill extend that far? For me I sweep maybe an inch / 25mm past what the quill will extend. Good enough for government work. No money in tramming the head to .000001 ??

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        • #94
          While the rotor the OP measured is probably very flat, his described measurements did not seem to address flatness, only parallelism.



          Originally posted by lazlo View Post
          Yeah Den, I'm really surprised too at the precision of that rotor. What brand did you ask for at Autozone?

          I never understood why folks don't like to use the mill's table directly: if you bend the DTI needle in the direction you're sweeping, the T-slots don't hurt the gage, but heck, it's nice to know that you can buy a "precision flat" for $20 at your local AutoZone.
          Paul A.
          SE Texas

          And if you look REAL close at an analog signal,
          You will find that it has discrete steps.

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          • #95
            Move along guys, nothing new to see here.....
            Ten plus year old necro thread.

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            • #96
              Originally posted by nheng View Post
              .

              Rotor thickness variation measured at 4 quadrants, at 2 diameters:

              +/- 0.00005"
              5 10 millionths, impressive to say the least. How did you measure this ?
              I use granite surface plates that will not measure that well.

              Last edited by Bented; 07-15-2021, 08:43 PM.

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              • #97
                Having the use of 2 mills, a round column drill mill and a lightweight knee mill, they both have the same tramming fault. With a 63mm shell mill, the double set of lines left is perfect in one X axis direction, but if cutting in the other X axis direction, then only one set of lines. The DM isn't ammenable to easy tramming, but the knee mill can be trammed with difficulty, we took an hour to do it and I would need a very good excuse to tilt the head on it in the future.

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                • #98
                  Originally posted by Bented View Post
                  5 10 millionths, impressive to say the least. How did you measure this ?
                  I use granite surface plates that will not measure that well.
                  My thoughts exactly Bented, I think the OP was dreaming when he posted 10+ years ago.

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