Caliper distance problem

[[SH...]]

Caliper distance and direct reading.
Today we got a customer complaint related to caliper distance measurement.My customer Don't have a caliper distance option,they are using 2011 version. when I measured in caliper distance between 3D line and a cylinder, centre to centre distance and they measured direct value of a 3D line with respect to alignment, my reading is greater than 0.015 millimetre then there reading.Then they came to my plant to check the variation, finally they understood that problem is in caliper distance and the 3D line direct measurement.They also don't know which method is correct,weather direct 3d line measuring and centre to centre caliper distance measurement.

I want to check Y value of a 3D line under its alignment. my alignment is two plane for special and planer rotation and one cylinder for x y z origin. So I want to check the distance between my cylinder and 3D line.

Which method is correct direct3d line measurement or caliper distance measurement??

[[Ch...]]

there is a note in calypso 2020 release notes, that says something about "fixed caliper measurement features with filters"

Basically I think they say features that were used for caliper distance filtering was not applied.

I did try to see how it would behave on 6.8 (Claypos2017), and I didnt notice a difference.

[[To...]]

Are they using a Zeiss machine aswell?
If yes, have you tried using their program?

With the little information that we got I would say that there could be other things giving a different result.

If this were my customer and they were saying that they don't know which method is the right.
I would start out by finding out if the parts are useable. If yes, then use the parts and align on verification method.

[[SH...]]

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Yes, they using XXT and I use VASTXT that is the only difference. They came to my plant create a new program and still have 0.015 difference. Part is acceptable condition. I have 0.03 tolerance so no big issue. They told me don't use caliper distance because they can't verify it in their end.
But my doubt is why this 0.015 variation??.

[[Ma...]]

Probably because of that caliper distance is measuring in selected coord system, but cartesian distance is calculated a little bit different ( it depends on select order of element ).

[[SH...]]

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Yeah, I think coordinate values of the 3D line gives the value of its local feature coordinate, my 3D line is along z axis. So the local feature coordinate will be the bottom, but caliper distance calculate the middle value of 3D line, obviously the 3D line projection angle will not be zero. But the problem is which value is correct or which value should I use!!!

[[Me...]]

All portions of a feature need to be in tolerance for the feature to pass inspection. Not just one location. Measuring 3d feature locations and/or features not reduced to a single point with a 2d tool is misleading and problematic. Just ticking an X, Y or Z location box and reporting that number is usually not the correct way to accurately measure a 3d feature.