Doing it the way you said, by creating an circle intersection of a cone and plane. The two clearance holes are shifted off the nominal position such that their edges. As for the 107 Diameter, you can do it 2 different ways. Maximum error for datum dimensioning as 45 opposite to each other. FYI The CMM measures concentricity like True Position, not the other way around. design drawing using MMC Position Tolerance with Datum A as the center axis of the 0.8 hole. Yeah, you would put your 0,0 point on Datum D and run your True Position callout to D in that alignment. If the groove is parallel to A and is a circular feature located in an off center bore hole that runs perpendicular to A:ĭeviationA=actual-nominal of distance from A surface to grooveĭeviationB=actual-nominal of distance from centerpoint of circular groove to center point of the ODĭeviationC=(max-min)/2 depth of groove (probably unnecessarily complicated but the depth only actually should be checked in two directions since some error in groove depth is in the same direction as the B deviation and already accounted for: draw a line from center point OD, to center point bore hole, draw a 2nd line perpendicular to the first line through the centerpoint of the bore hole. Tolerance stacks are used to describe the.
From a thought experiment standpoint, think of the datums as what holds the part in place, and the position value is how far away from the location of the perfect part. 1 -B- Center X Feature Target Center Feature Actual Center 10. Is the groove parallel to the A surface? Also how is the bore hole (C) positioned relative to OD (off center but the axis are parallel? I use a CMM to check position back to 3 datums all the time. Datum - A theoretically exact point, axis, or plane derived from the true geometric counterpart of a specified datum. Why the Answer : The result for True Position can be thought of as the diameter of a circle, centered at the target (basic dimensions), that contains the actual center. Can you share the print? It would be a lot easier with that.
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