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First of all, I want to mention that this is an excellent community. Even as a newbie, I have been amazed by the support everyone provides on this platform. A bit of background: I have a degree in Mechanical Engineering and have been working as a Program Manager in the automotive industry in...

Lets say if there is another hole below C Datum hole, referencing the datum features as attached. Then what would be the pin size of C datum.

Sorry, since I am new to this. One of my co-workers statement is that C-datum should be constrained with its True Geometric counterpart i.e. Ø5.07 mm pin. What do you think of this statement

So, should we just use Ø4mm pin for A-datums? Also, does that mean we should use (5.07-.20)= 4.87 pin for C-datums?

I am attaching a simplified part drawing that I have to make a checking fixture of. Following are my queries: 1. I was thinking of holding the A datums using 4-way locator pins (conical), so both holes are concentric but then I realized if I do that, how would the part touch the B-datum, what...