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Probe Calibration and Form Resutls

acgarcia
Can probe calibration affect form results?

Using TP20, 3 way (T-shaped) build. Taking about 50 vector points around a cylinder and constructing a cylinder (least squared). Output cylindricity and it measured 0.0024" yesterday afternoon. Calibrated the probe this morning, re ran the same part and cylindercity measured 0.0011". All the other diameters and distances measured were different by 0.0001"-0.0002".
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  • , I don't have much experience using graphical analysis but i'll play with it. I was thinning of reporting t values of each of the points as a test program.

    , yes, the part did move out of the CMM and was put back in. We are in the upper 40s low 50s right now.

    Go the insert, report command, analysis. Choose the cylindricity reporting (the mouse cursor on your code needs to be after the cylindricity callout) change the multiplier to 100 (the bigger the value the bigger the arrows that showup the deviation) and press view window. You will have a visual representation of the points, the limit lines etc. Do this for the of them and see if there is 1 point that is causing this difference (most probably a burr or impurity on the part) or there are more. Also repeat with a different tip. Maybe the tip has a micro crack somewhere and is randomly causing spikes.
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  • , I don't have much experience using graphical analysis but i'll play with it. I was thinning of reporting t values of each of the points as a test program.

    , yes, the part did move out of the CMM and was put back in. We are in the upper 40s low 50s right now.

    Go the insert, report command, analysis. Choose the cylindricity reporting (the mouse cursor on your code needs to be after the cylindricity callout) change the multiplier to 100 (the bigger the value the bigger the arrows that showup the deviation) and press view window. You will have a visual representation of the points, the limit lines etc. Do this for the of them and see if there is 1 point that is causing this difference (most probably a burr or impurity on the part) or there are more. Also repeat with a different tip. Maybe the tip has a micro crack somewhere and is randomly causing spikes.
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