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[–] curiousPJ@lemmy.world 11 points 2 years ago (1 child)

The total tolerance is .0004". In equally disposed bilateral tolerancing it will be +-.0002".

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[–] AlDente@sh.itjust.works 4 points 2 years ago (2 children)

Eh, if someone tells me to reduce a tolerance from 5 to 10 thou at work, it's understood that it's +/-5 and 10. I don't think I've ever heard someone use the full range of a tolerance in conversation. If the tolerance isn't bilateral, it would be said like plus 5, minus zero. Anyways, +/- .0005" is our standard tolerance on the span of all dowel hole pairs.

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[–] curiousPJ@lemmy.world 2 points 2 years ago* (last edited 2 years ago) (1 child)

Bilateral tolerancing is a Machinist's first introduction to tolerancing so it's no surprise to run that as default. And I suppose GD&T is not heavily used where you are.

If you're given a parallelism tolerance of 10 micron are you assuming that to be +-10 micron? True position? Angularity of 5 thou? Etc... The only feature control that could be interpreted as bilateral by default is profile and it's still communicated by its total tolerance.

Simple +- tolerancing isn't the industry standard anymore. And if Tesla prints are anything like spaceX ones... It's basically all GD&T and minimal title block tolerances.

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[–] AlDente@sh.itjust.works 1 point 2 years ago

I use GD&T on all my drawings, including 100% of my hole callouts. However I'm one of the more enthusiastic adopters of ASME Y14.5 at the place I work. Therefore, I get what your saying regarding the tolerance range, but since most of my coworkers are still relying on block tolerances, I'll refer to a .010" positional tolerance as a "+/- .005" equivalent" in conversation so there is no miscommunication. I can see how this is not the norm.