Difference in reporting profile with one result vs two results?

[[Ri...]]

I'm curious to know why a "Bilateral with unequal distribution - two results" reports significantly different results than "Bilateral with unequal distribution - one result"?

One result.PNGTwo results.PNG

[[Ch...]]

Rick,

Same as here : viewtopic.php?p=46225#p46225

I'd like an answer from Zeiss - my best guest theory is that up until the GDT Beta engine, they had a few different ways to try to compute profile for ISO + ANSI, but it was up to the user to decide the method. I am thinking they have overlooked something in the past, either that or it is defaulting to ISO which offsets the nominal band.

I'd be curious what this reports with the GDT BETA Engine turned on, for both ANSI and ISO.

❓ 😐

[[Ky...]]

Hello Rick,

What you are seeing is caused by the fact that when doing the one result, the profile is calculating from the symmetry line of the tolerance zone (in this case +0.01 material from the part in question) while the two results is giving you the deviations from the part itself. Calculating it out, the furthest deviation in this case is the min point (+0.00226 from the part) and if you subtract that from the symmetry line, you have -0.00774. Take the absolute value and multiply by 2 (for the total distance requirement) and you have 0.01548. Taking into account rounding, that is what you are seeing in your single result.

The results are all discussed in this document:
https://portal.zeiss.com/knowledge-base?id=415735

I hope you find this helpful.

[[Ri...]]

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That's what I needed. 😉