Slot - Perpendicularity Evaluation

[[Ke...]]

I have a slot perpendicularity callout of 0.100mm, that is applied to the width in a multiple single segment control frame.

The material is 8mm thick, so the walls of the slot are 2.5mm x 8mm.

As an example:

When I recall the points into a Symmetry Plane, the form of the Symmetry Plane is 0.111mm (the form of each wall of the slot is 0.040 & 0.060mm). The Perpendicularity of this example is 0.1470, to the Datum. However, if I scan the entire feature as a 360 degree slot at multiple levels and recall those derived centerpoints into a 3d line, the perpendicularity of that 3d line is well within 0.020.

I feel that, since the perpendicularity callout is tied directly to the Slot Width, then the Symmetry Plane evaluation is the correct one...

Agree or Disagree?

 

Thanks!

 

[[Ky...]]

Considering the position of the feature control frame (and the double arrowed line) I would actually interpret that more as a position and perpendicularity of the symmetry plane between the two sides rather than the slot itself.

[[Ca...]]

I agree with Kyle.

The perpendicularity call out is a refinement of the positional call out. Which means the 3D line method you mentioned would more accurately report what the print is calling out.

[[Ch...]]

I agree with the above as well, however is anyone is pressing you for more ... I have measured the side radii and cylinders and you can get the perpendicularity of all the 2 radii and 2 planes and report all 4 or simply report the maximum of all 4 as the 'slot' perp value.