MIE for Ø

[[Ni...]]

Hello all,

It may be a stupid question but here goes.....what is MIE when it comes to the reporting of a bore? I have a customer requesting Cylinder LSQ diameter and Cylinder MIE diameter of a bore, LSQ is no worries but I've never had to use MIE. Thoughts??

[[Aa...]]

For a bore, MIE is the same as OTE. It is sensitive to noise and "high spots". Filtering will effect your result.

Effectively, it's the largest theoretical pin that will fit in the bore.

[[Te...]]

Here is something I used for my Zeiss certification see if this helps explain the difference. This document will show you how to do it in Calypso as well.

There is also some explanation of the difference between Functional and process control.

Document note:
The example used was to prove a point, this was a part I had access to for the short time (2 weeks) I had to prepare for the certification so when you look at the values they are extremely small. If I would have had more time I would have had the plate remade and the holes drilled or made with a dull end mill which would have helped prove the point much better.

Task Oriented Measurement.pdf

[[Ow...]]

Ted,
The distinct narrative and illustrations you add to your training documents are nothing short of fantastic in my opinion.
Thank you very much for sharing.

[[No...]]

I hope Zeiss will some day publish a cookbook for injection molded plastic parts, because many of the strategy recommendations in the current cookbook don't necessarily apply there.
We use MIE a lot in process control, and for a reason.

[[Da...]]

Ted, thank you very much. The pdf you are sharing has a great examples in it. However, for functional control the datum A should be evaluated as outer tangential element, right?
But this might fit in some other pdf and topic.
Don't get me wrong, after your post I opened CB again, which has some dust on it and would like to understand stuff.

And what Norbert said, CB for plastic parts and another CB for design engineers that deals with plastic 😃

[[No...]]

You know the old saying: If you know plastic, you stick with metal. 🤣

[[Te...]]

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Datum A (actually all Datum features) for Positions and Profiles should be evaluated outer tangential no matter if it is functional or process control, this happens when you turn on Outer Tangential and ISO 5459 in the Form Datum tab in Extra/Settings/Measurement and break out the position and profile into the individual datum features.

I have attached a picture of the correct way to do Position and Profile with Calypso.

Position and Profile Correctly.JPG

[[Lo...]]

Very nice Ted, but I'm having a hard time with this. Its the same for the Cookbook. I neither think most will have multiple programs for part conformity nor most customers would never accept different evaluations of the same inspection. It would get into 1 passes and 1 fails. Whats good? In the automotive world most of our programs are set in stone at the time of PPAP and never altered.

I can see this being the case if one was trying to evaluate an internal process for another reason outside of data collection used for part reporting or CPK. Most will collect data from the program that's used for daily production to report capability and such. I never really understood the cookbook because of this. I guess if a shop had a part that they needed to know if it would work, but the process may not be stable yet, then OK.

[[Ni...]]

Thank you to everyone for the help!