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Overriding Hole Sizes in Reports

Our engineering staff prefers that I use gage pins to measure hole sizes instead of the result calculated by the CMM measurement. This is not a problem for a diameter size callout - I simply use a Keyed In Dimension and type in the result measured with a gage pin at that point in the report. The problem is when I have to report the True Position for the hole because then the measured hole diameter for the keyed in dimension doesn't match the measured hole diameter in the true position dimension - which uses the diameter calculated by the machine measurement - not the pin.

Is there any way to override the measured hole diameter in the True Position calculation so that it will use the number that I've inputted through a Keyed in Dimension?

This is how it would look in the report -



MEASUREMENT POINTS - MP06
==========================
DIM MP06= KEYED IN DIMENSION
AX NOMINAL MEAS +TOL -TOL DEV OUTTOL
D 5.500 5.530 0.100 0.100 0.030 0.000 -----#---


MEASUREMENT POINTS - MP07
==========================
DIM MP07= TRUE POSITION OF CIRCLE MP_6 UNITS=MM
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 2940.800 2940.908 0.108
Z 1290.570 1290.465 -0.105
DF 5.500 5.528 0.100 0.100 0.028 0.000 -----#---
TP RFS 0.300 0.000 0.302 0.000 0.002 -------->
Parents
  • I would recommend taking some time and some ring gages and developing some techniques to be able to measure diameters reliably.

    Use large prime numbers of points, large pre-hit & retract, sample hits, scans, and of course Max Inscribed.

    Once you can get repeatablility within the CMM's capability, and you can prove it, then start working on gaining the trust of your engineering staff.

    A key component is to be able to demonstrate that you can measure diameters for which there are no gage pins. This will go a long way to showing them the capabilities of the CMM. Getting them to believe the numbers involves the ring gages.

    Good luck!
Reply
  • I would recommend taking some time and some ring gages and developing some techniques to be able to measure diameters reliably.

    Use large prime numbers of points, large pre-hit & retract, sample hits, scans, and of course Max Inscribed.

    Once you can get repeatablility within the CMM's capability, and you can prove it, then start working on gaining the trust of your engineering staff.

    A key component is to be able to demonstrate that you can measure diameters for which there are no gage pins. This will go a long way to showing them the capabilities of the CMM. Getting them to believe the numbers involves the ring gages.

    Good luck!
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