Best Fit Positions

[[To...]]

On the drawing below, there are 2 position call outs, one for each set of pins. I started by doing a best fit bore pattern position on the 2 larger pins, allowing rotation only. Then, I selected the best fit alignment created from that position for the set of 6 smaller pins.

Does this sound legit?

Screenshot 2023-12-06 084438.jpgFetching info...

[[Ja...]]

Simultaneous requirement applies in your case as they follow the same datum sequence. So your best fit bore pattern should include all the 8 pins with rotation allowed.

[[To...]]

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Fortunately or unfortunately., the drawing does not contain the verbiage "Per ASME Y14.5-XXXX", so the simultaneous requirement technically is not in play. In fact, the bolt circle diameters are ±.0020" and not BASIC. I agree that your solution is best but I am bracing myself for feedback that the customer doesn't understand this. 😃 😃

[[Th...]]

You might be saved, or doomed, by ASME PDS 1.1, which specifies that documents using ASME symbols (but lacking a reference to a specific standard) are to be interpreted according to the standard that was in effect when said document was published.

[[Ro...]]

I hope this is how its done, because that's how i do it.
Usually is like TP .010" ABC for each hole
then maybe TP .003 A underneath, that's the one i do the best fit pattern on.