Rant

I have engineers here that have basic dimensions to control true position callouts-and they have true position callouts on those basic dimensions also!! They got upset cause i told them it makes no sense.. I have a hole with a TP .005 to A and B, and i have basic dimensions from A and B and then TP .004 of these dimensions to A.. How does that make sense?? how am i supposed to even inspect that ...but what do i know!!

AM I WRONG HERE???

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DAN_M over 3 years ago

With -B- as the plane that is perpendicular to the holes, then this is a "legit" callout (poor attempt at making a composite dimension). It certainly isn't how I would draft this, but it is mathematically feasible.

The hole can be within 0.005 to A|B (diametric tolerance zone)...AND it can simultaneously be within a 0.004 radial T.P. (since only one axis is called out its a ±0.002 of that hole location rotated to the the hypotenuse so 0.1517±0.002) back to -A-.

Yes, if the 0.004 was at high limit then you'd most likely be blowing the 0.005 T.P...but it could still work.
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DAN_M over 3 years ago

With -B- as the plane that is perpendicular to the holes, then this is a "legit" callout (poor attempt at making a composite dimension). It certainly isn't how I would draft this, but it is mathematically feasible.

The hole can be within 0.005 to A|B (diametric tolerance zone)...AND it can simultaneously be within a 0.004 radial T.P. (since only one axis is called out its a ±0.002 of that hole location rotated to the the hypotenuse so 0.1517±0.002) back to -A-.

Yes, if the 0.004 was at high limit then you'd most likely be blowing the 0.005 T.P...but it could still work.
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