When a tolerance is not called out on a print for hole location, what is the industry standard?
When a tolerance is not called out on a print for hole location, what is the industry standard?
There should be a spot in the heading that says all other tolerance.
no tolerance listed on print except for the cut length of the part
the answer requires context. this might be viewed as an aberration in commercial circles, it is common if not the norm in model engineering/home shop plans where the builder does have complete knowledge of the mating parts and function. you pick a fit based on the intended purpose
edit: I'd add to that answer, if tolerances aren't stated they can be inferred from the number of significant digits in the dimension, but it would help in answering if you described the type of plans, part, function etc as if they are diy plans tolerances and clearance are usually up to you
I agree with jackson. I've seen where a complete book of "standards" is supplied with the RFQ. Many large companies have their own standards for materials, coatings, plating, dimensional tolerances etc. So, like jackson said, better to be safe etc.
DZASTR
99% of the time you'll be safe with +/- .005, and if they are reamer holes that are to be spaced a certain distance apart, we get +/- .0005. If you have a cnc and type in the right coordinates, you should be fine. Unless the piece is not on size.
There is no "Industry Standard" if it isn't on the drawing then you need to call the customer. End of story. Assuming a number will get your parts rejected.
Yesteryear, that may apply. Unfortunately, more and more I am finding that companies are deviating from the norm and using their own tolerances. We have jobs that run in our shop that have 3 place decimal tolerances of +/- .015 on down to +/-.001. It just seems to depend on the customer and what their needs are as to what their "standards" are. When in doubt, always ask the customer. As said before in this thread, better to be safe than sorry. A phone call is a lot cheaper than having to run the job over because it was assumed.
:cheers:
When you do contact the customer, get it in writing. If you feel akward asking him to put it in writing then write to him yourself saying "further to our recent conversation, I confirm that we shall hold tolerance on dimension X to +- whatever".
I love deadlines- I like the whooshing sound they make as they fly by.
If the tolerances are not specifically called out I would state, in writing, what tolerances you expect to achive at the price the job was quoted. If the customer has any comments you simply tell them that that was how it was quoted and you may need to re-evaluate the quote.
BTW, why is this in the HAAS forum?
Jeff Lange
Lightning Tool & Manufacturing, Inc.