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"SP600" probe measures too small

Henniger123
Good day,

I have a problem with the "SP600" probe head.
The diameters are, regardless of whether they are scanned or with an auto-element circle, it is always exactly 0.010mm smaller than it should.

Tested on a purchased ring with a certificate

Calibration says 1my standard deviation.

Maintenance says everything is ok.

Temperature compensation is off, but the room temperature is 20.5 ° C

Is it possible that the calibration is set incorrectly?
or is it a hardware error?

what can i do differently?


Useing pcDMIS 2020R1


Thank you for your time

Parents
  • The lower matrix just define the orientation of the head from cmm axes.
    A "static head" (or measuring head) is a kind of cmm, with 3 deformable parallelograms perp between them (this def is wrong for a SP25 !)
    When the ball touches the part, the parallelograms are deformed, so the cmm moves in a direction that equilibrates them.
    The orientation of parallelograms is measured while the lower matrix calibration.
    So this calibration is done only with A0B0...
    Take a look at this old doc, it's really interesting about parameters and matrix...
    ftp://ftp.wilcoxassoc.com/docs/How%20To%20Docs/Sp600.zip
Reply
  • The lower matrix just define the orientation of the head from cmm axes.
    A "static head" (or measuring head) is a kind of cmm, with 3 deformable parallelograms perp between them (this def is wrong for a SP25 !)
    When the ball touches the part, the parallelograms are deformed, so the cmm moves in a direction that equilibrates them.
    The orientation of parallelograms is measured while the lower matrix calibration.
    So this calibration is done only with A0B0...
    Take a look at this old doc, it's really interesting about parameters and matrix...
    ftp://ftp.wilcoxassoc.com/docs/How%20To%20Docs/Sp600.zip
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