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Angled/Extended Tolerance Zone

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GravyBagel

Aerospace
Sep 30, 2022
15
I am seeking to angle a tolerance zone for a hole and extend it in that angled direction. For my purposes, the angular requirement is fairly tight, while the length requirement, not so much. The hole is being mated to a slot with a dowel pin. This is not my desired choice of frame, but it must mate to an existing piece with a similar setup, so I don't have much choice. The tolerance zone I am looking for is one that preserves the angle to B, but allows translation along that angle, hopefully producing an allowable feature envelope like the hatched area shown.

Have I executed this correctly or is there a better way to do this? The attached sketch is a non-actual representation of the drawing, so it is not complete.

Thank you.
 
 https://files.engineering.com/getfile.aspx?folder=88381ee0-a59a-4068-8d92-6a7054c4ed4f&file=Tolerance_Zone.png
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It's a bilateral zone, similar to a slot. Have one position tolerance along the angle and the other perpendicular. Neither will use the diameter modifier.
 
That was something I was thinking about, but it didn't feel right, which is why I went down the path of multiple single segment controls.

Is this what you mean or have I misinterpreted what you wrote?
As always, thank you 3DDave, you've been very consistently helpful!
 
 https://files.engineering.com/getfile.aspx?folder=64b80c50-ae62-41d0-a10e-61800a47709c&file=Tolerance_Zone2.png
You can make the diameter separate - you need only one.

You might also want to add a separate callout for perpendicularity so the hole isn't at an extreme angle, to the longer zone.
 
So I didn't feel great about this solution. I don't like the idea of controlling directional tolerance based on an implied angle that a dimension is aligned with that doesn't actually call out an angle in some way.

I had a chance to sleep on it.
What about combining position, angularity, and perpendicularity into one frame. It seems to control everything in the way I want it controlled.
 
 
 https://files.engineering.com/getfile.aspx?folder=37673814-1afb-49fd-9737-3e177fbae35a&file=Tolerance_Zone3.png
The angle was clearly stated and the alignment was that such things that appear to be 90 are expected to be 90. Now it doesn't say anything at all as the angularity is of the axis of the hole to a surface, not to follow the slope. Sort of a step backwards.
 
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