BASIC Cylinder Scan using Pitch function

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  • BASIC Cylinder Scan using Pitch function

    Could someone running 3.5mr2 verify this for me???

    I am using BASIC CYLINDER SCAN W/PITCH active in the X+ working plane. I am seeing the machine loose the pitch along the scan and end up at a different endpoint at during random executions. Meaning....if it starts the scan on top of a thread peak it should end at the specified distance at the top of the thread peak. It sometimes ends up in the valley of the thread, sometimes not.

    I do a manual align with 2 DCC alignments prior to measuring this feature and I cannot understand how this is happening randomly.

    anyone wish to test this please?
    Last edited by Mike N.; 01-18-2007, 12:37 PM.
    sigpiccall me "Plum Crazy"....but you only go around once!

  • #2
    Could the pitch be entered incorectly? One transposed digit there would really make a mess.
    When in doubt, post code. A second set of eyes might see something you missed.
    sigpic

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    • #3
      example pic

      Originally posted by John Kingston View Post
      Could the pitch be entered incorectly? One transposed digit there would really make a mess.
      no dbl ck'd it and it's correct.....that wouldn't cause it to be random


      I even shows it in the graphics .....where one scan should be right on top of the other (look at start pt they match)....but its trailing off at the end....see pic attached
      Last edited by Mike N.; 05-17-2007, 10:56 AM.
      sigpiccall me "Plum Crazy"....but you only go around once!

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      • #4
        Poor positional control, maybe??
        Links to my utilities for PCDMIS

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        • #5
          If I had to guess I would look at the alignment. I t should start and stop in the same place, I am running mr1 and it works fine for scan for me, but the alignment is always very close. If you are useing a slightly rotated bolt pattern then it could really skew it.
          I talk dirty to my cmm. Justn

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          • #6
            As I think about it if you are actually on a thread, that might be the problem. Thread sizes can have alot of variation and still be good, since it is a scan use the filters to kick high and lows so you get real data.
            I talk dirty to my cmm. Justn

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            • #7
              Since it is random, I'm going to say alignment like everyone else.

              I guess I would try measuring a cylinder w/pitch in the hole and then do an alignment to that (rotate, transfer y and z orgins). Then try the scan. That way, no matter if the thread is off location, when you do the scan you will be getting the best possible data because it will be based on the actual location of the cylinder and not the "nominal" location.

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              • #8
                Is a SCAN not rows. Pitch relates to the spacing, and the scan travles in a sprial like a screw. I never use it except on a few parts, just to show off the abilitys and for cylinders, and I never use it in X or Y since the deflection would be to much. It is very cool to watch, and will impress the **** out of customers.
                I talk dirty to my cmm. Justn

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