Quote:
Originally Posted by Grant Cox
magnets - Please reply to this thread (or send me a PM) with your order number and who you ordered it from (WCP, Robot Space, or VEXpro) and we can look up the status of your order.
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Thanks, but we've already been in contact. We don't desperately need the parts, and the customer service has been really great. Sorry for coming off as harsh.
Quote:
Originally Posted by Paul Copioli
We agree on this: Good GD & T is essential to make parts that function properly and as required. All of our manufacturing drawings have fully dimensioned drawings with GD & T per ISO standards. Our customer interface drawings will never have them. Why? We believe that is proprietary information. We believe that prescribing total runout (because concentricity in the GD&T world has nothing to do with rotating a surface around an axis) for a hexagonal hole is one of the most complicated things to get right.
So, in general, for VEXpro items, things that are supposed to be locating features (versakey system, bearing bores) will be true and things that are fastening (screw counterbores) will be at the maximum allowable tolerance for the fastener to fit.
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This I get, and I must say, that all of the vex pro parts are just awesome in terms of tolerances.
You're right about the concentricity. I was going to write about something else, but totally forgot to add it. The GD&T concentricity (average or median location of points on circle, I forget which one) is useful for shafts, as at high speeds vibration happens. We've only seen this being a problem when reusing custom gearbox shafts in high speed applications.
Tonight, out of curiosity, I measured a few parts to check the tolerances. I was unable to measure any runout on a hex hub we got today with some cheapo digital indicator. This is the first time I've ever seen this on an FRC supplier part like this.