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So, if it's _just_ a tin shop, one has to wonder what GD&T brings to the party, and why the engineers started using GD&T. You won't likely change the engineers' minds; you have to find and re-educate whichever Heavy Hitter got talked into it. I'd never thought of it that way, but "tin shop"...

All excellent points and I agree 100% but believe me, that's not what's going on here. Our enclosures are pretty low-precision (and frankly, pretty crude) pieces of equipment. Does the PCB fit? Are we chafing any cables? Are we able to dissipate heat? Do we comply with our client's EMI/EMC...

"If you take off the GD&T stuff (position, profile, perpendicularity), guess what -- those qualities don't cease to exist! They will just have to be stated in a different way. And I'll bet that when the GD&T is stripped off the drawing, your designers don't bother to address those qualities any...

Here's another related question: Our drawings specify a blanket ±0.5° angle tolerance in the title block, and my understanding is that it implicitly applies to all perpendicular surfaces on the part that are not explicitly dimensioned. In your opinions, would the same blanket tolerance also...

"You do realize you are asking people who apply tolerances for a living?" Haha, yes. I was one of those people until a relatively short time ago, and I may well be one of them again one day. I understand the point of tolerances and wholly support their prudent use, but friends don't let...

"Have the engineers give you a tolerance stackup to prove their tolerances work." Nope. These particular GD&T tolerances don't stack: Flatness specs on machined parts that mate with sheet-metal parts that do not have matching flatness specs, parallelism specs on surfaces that don't mate to...

"You haven't demonstrated to me that the tolerances are superfluous." No, I haven't. Nor have our engineers attempted to justify them to me. But I was the original designer of the precursors to these enclosures in a previous stint with the company, and since they have changed remarkably...

I'm the Senior Manufacturing Engineer for a mid-size electronics manufacturer, and our Mechanical Design Engineers have recently started to put GD&T tolerances in all sorts of strange places: - 0.02" perpendicularity specs on PEM studs up to 1" long. - 0.005"-0.015" flatness specs on machined...