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Hi Walt, thanks for the response. The device is a PMA with a very small air gap between the rotor/stator and a relatively thick shaft so I believe "rigid rotor" is an accurate classification. Here are some more details about the design: RPM: 25000 rpm Mass: 0.1 kg I do not have access to the...

Good morning! [wavey2] I am reviewing an existing rotor design where Dim b is 0.65" and Dim d is 0.4" (see picture below). The distance clearly violates ISO 1940/1 - Balance Requirements for Rotors (link to doc which references ISO 1940/1). My questions are: [ol 1] Since distance d is so small...

For this comment, I think I'm following and understand how the datum shift impacts the inspected parts. But could some comment if the exact same range of parts would pass inspection of the callout was flipped per my original post? So the FCF would be moved to Datum A and say: |perpendicularity|...

Chez311, thank you for the information and link. It was helpful to read your thought process in the other thread. I am now trying to visualize a functional gauge, and am wondering if this is correct. This is based on my understanding of "what datum shift does is actually loosen the relationship...

Thanks for the reply greenimi. It is indeed ASME, specfically ASME Y14.5-2009. To give some background on the design intent, this is a stator which mates with a rotor. The most critical dimension is having sufficient clearance or "air gap" between the rotor and stator. The rotor is attached to...

(Per ASME Y14.5-2009) I just ran into an old drawing which has what I have now learned is datum shift. This concept is quite new to me, but I have become the person to settle an argument of if the usage of it in a drawing is illegal or not (simple example below). The first picture is the...