Tolerances of different process
Tolerances of different process
(OP)
Hope this is the right forum.
I need to specify flatness, straightness etc but I never know what is a realistic value to place on the tolerance. Most things are machined and ground if need be. I understand that for straigntness/flatness the overall length must come into it but I have no idea what to put on.
Are there any web resources etc that may help?
Thanks in advance
Parsnip
I need to specify flatness, straightness etc but I never know what is a realistic value to place on the tolerance. Most things are machined and ground if need be. I understand that for straigntness/flatness the overall length must come into it but I have no idea what to put on.
Are there any web resources etc that may help?
Thanks in advance
Parsnip





RE: Tolerances of different process
A lot of people will say it varies so much from shop to shop/tool to tool etc that's it's almost meaningless to have typical values.
I'm not sure I'd go that far but for sure, one of the best ways is to talk to your machine shope/vendor to see what they can do.
KENAT, probably the least qualified checker you'll ever meet...
RE: Tolerances of different process
I appreciate engineers who take current manufacturing capabilities and methods into account when they are designing/tolerancing components. Obviously, the looser the tolerance the easier it will be to meet and I prefer as big of a "window" as I can get. However, never sacrifice safety and try not to adversely affect functionality just to meet what manufacturing may want to see on a tolerance as the cost of potential downline or field failures could far outweigh the additional manufacturing expense.
Regards,
RE: Tolerances of different process
KENAT, probably the least qualified checker you'll ever meet...
RE: Tolerances of different process
TOLERANCE is an engineering design requirement.
RE: Tolerances of different process
Maybe do a google on General Rule #1 and see what pops up.
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RE: Tolerances of different process
Parsnip
RE: Tolerances of different process
I would not invoke it directly as I disagree with the certain ways it's invoked etc but...
The typical values by size of feature & precision of machine shope may be usefull.
Did you look at the other thread I referenced, there is stuff that may be of use.
KENAT, probably the least qualified checker you'll ever meet...