Just uncovered how exactly profile tolerances work in V4.1 (of course I never worked in a version lower than V4.0). Here are a few cases:

Let's say you measure 3 point and you want to know what the profile of this "Set" is to a datum, here is how PC-DMIS calculates it:

Case 1: all individual point-profiles are negative: PC-DMIS reports the lowest negative number (the MIN). This is correct.

Case 2: all individual point-profiles are positive: PC-DMIS reports the highest positive number (the MAX). This is correct.

Case 3: some individual point profiles are negative and some are positive. PC-DMIS will report THE RANGE!!!! It takes MAX and subtracts MIN. This gives the range. As you can imagine, the range can be almost twice the tolerance. So quickly PC-DMIS starts to report OUTTOL.

It is my opinion that this is wrong, but who am I. This is the way it works and I can work around it. I am just glad that I finally understand. I will now start to report MIN and MAX instead of MEAS. From both MIN and MAX I can easily calculate the real profile tolerance.

For those who wanted to know....

Hope you enjoyed it, Jan.

Let's say you measure 3 point and you want to know what the profile of this "Set" is to a datum, here is how PC-DMIS calculates it:

Case 1: all individual point-profiles are negative: PC-DMIS reports the lowest negative number (the MIN). This is correct.

Case 2: all individual point-profiles are positive: PC-DMIS reports the highest positive number (the MAX). This is correct.

Case 3: some individual point profiles are negative and some are positive. PC-DMIS will report THE RANGE!!!! It takes MAX and subtracts MIN. This gives the range. As you can imagine, the range can be almost twice the tolerance. So quickly PC-DMIS starts to report OUTTOL.

It is my opinion that this is wrong, but who am I. This is the way it works and I can work around it. I am just glad that I finally understand. I will now start to report MIN and MAX instead of MEAS. From both MIN and MAX I can easily calculate the real profile tolerance.

For those who wanted to know....

Hope you enjoyed it, Jan.

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