True Position of Angled Hole depth

[Liam_1968]

I am reporting the depth of some angled flat bottomed holes as a true position. I have drafted a basic drawing to explain the feature and the DRF. I have tried reporting it with the X, Y and Z ticked in the 'Nominals' tab, and with just the X ticked. I have also reported the depth as a T value. None of the results tie up with one another. Datum plane A is a plane on the face, datum B is the Ø10mm hole as a cylinder and datum C is a midpoint in the 10mm slot. Can anyone advise: 1. Am I using the correct features to define my datums (not A, just B and C) and 2. What is the correct process for generating the results with regards to the axis selection tick boxes in the nominals tab. Thanks in advance.

[NinjaBadger]

Offset your alignment 40.2 from Dat A, then rotate 25° around, then you should just report in one axis and the nominal should be 60.

[NinjaBadger]

Doesn't just have to be on co-axial features @DAN_M.

A-B on a plane-cylinder is perfectly valid, as is A-B on two holes (In effect you're splitting the difference between them so neither had precedence).

https://www.dropbox.com/s/0lq4yj7v8w...datum.JPG?dl=0

[DAN_M]

Thank you very much for the explanation! I have never seen it used like this before.

[NinjaBadger]

I can't remember where I got that from, I'm guessing it was an ISO standard but I can't be certain (looks like it though).

[Liam_1968]

Thank you everyone.