"Bogus" Datum Reference Frames (Summer 2024)

[@sem7207]

Great video! finally a good explanation about the problems with those non-functional datum reference frames that mix datum references from different interfaces. But I think there is a problem with the profile callout on 25:20. I don't think it makes sense on top of the perpendicularity tolerances. It cannot control location in the relevant direction because the A,B(M) DRF doesn't constrain that translation, so it really acts as an orientation control, but that's what the tighter perpendicularity tolerances are for.

[@andrewseitz9166]

Great video - I've been guilty of the alphabet soup and this, along with your other videos, really does a great job helping to explain the FUNCTIONAL aspects of GD&T.

[@gdtguychuck]

Thank you! Tell a friend or colleague!

[@benkasper4035]

I think if i added anything like that the machine shops would just triple the prices out of spite

[@BADzooka]

Thank you for the thorough video. Definitely learned some new tricks!

[@swamihuman9395]

- Excellent. Thx. - I'm relatively new to GD&T, and certainly understand the concept, along w/ the symbols - BUT, assigning control frames in practice, per good practices is were this content really helps.

[@gdtguychuck]

Glad it was helpful!

[@QwertyCanada]

Can't appreciate your work enough.

[@josephbrown3166]

This is so helpful. The extra CAD models to show how ridiculous the incorrect drawings would be to manufacture or measure were the missing piece for my understanding of this concept.

[@gdtguychuck]

Glad to hear it!

[@andrewseitz9166]

Question not necessarily related directly to this video, perhaps something worth covering in another video, but how do you deal with setting positional tolerances on mounting holes which are meant to mount purchased components? Say for example you want to mount a gauge that you're buying to a panel that you're designing. That gauge has (4) threaded holes in a pattern which you'll use to mount the gauge to your panel. The vendor doesn't provide a virtual condition or FRTZ of the threaded holes and all they provide is the nominal or basic pattern dimensions. Do you assume a certain tolerance for the buy part? This is such a common occurrence for me and I'm sure for others as well, but I've never seen a recommendation on how to handle it.

[@jaypanchal1997]

I really appreciate your content. Being a fresher mechanical engineering student I want to learn proper GD & T . Moreover, I watched several videos on GD &T on KZbin but they just teach only the rules and regulations of GD& T. But I want to learn the application of GD & T. Respected sir, please guide me.

[@gdtguychuck]

At your service! You can see that I am doing this a little differently, and learning how to present it as I go along.

[@ganeshkorade5508]

I really liked your video. Great reminder not to use a global DRF for the entire part just because manufacturing can make it in one setup or the engineer had no preference. I understand your usage of “bogus”, but instead terms like “false,” “fake,” or “invalid” are more appropriate. “Bogus” can imply something is inaccurate, deceptive, or simply doesn’t hold true, so “false” or “unreliable” would capture that sense well.

[@孙小圣-d8u]

你好

[@孙小圣-d8u]

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