That’s very good to know thank you! Luckily for me I have little interest in unresponsives 
otherwise that would have been a waste.
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Not necessarily, it just runs the risk of being way too tight (can’t install straight, can’t remove) or way too loose (vibey as hell because the center of rotation is not at the center of the bearing).
Giving the shop a wider tolerance doesn’t mean you absolutely will be outside the window of what works, it just means that you’ve told them that the potential for the final part not working correctly is within your spec and is therefore allowable to ship. The machine shop could hand you absolute junk and so long as it was inside what your print allowed they would be able to point you at where you explicitly said it was ok to make it that way.
On the other side of things, what you put in your print is considered a contract of sorts. If they agree to take the job and they don’t hit one your tolerances and your parts don’t work as a result, you are absolutely within your right to have them remake your parts. If it wasn’t NDA’d I could share a real-world example of where that saved my butt in my day job.
The gist of it is that we sent out for parts we couldn’t make in house. What we got back was way less functional than we expected I was going NUTS trying to figure out how we screwed up the design. Then I started measuring some of the less obvious dimensions that were fairly critical for proper function and compared the results to what my boss put in the print. Long story short, I was able to prove that the machine shop screwed up about 10 grand worth of mission critical parts and they had to remake the entire order.
At some point I’ve really gotta write something up detailing how to work with machine shops that don’t already know exactly what you need…
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if its not fpm or topyo does that mean its….
Y O Y O E M P I R E ? !
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