tolerances

[jprobst]

when there is not a tolerance called out on a print for hole location, what is the industry standard?

[cdlenterprises]

Inch or metric? Does the title block have an "Unless other wise specified" box? Typically a three place (inch) is .005, two place is .010. Not sure about metric. This is unless there are GDT callouts such as true position or the location is a basic dimension(has a rectangle around the locating dimension), in which case there is usually a profile callout somewhere on the print for inter-related features. Hope it helps...

[in2steam]

Originally Posted by jprobst when there is not a tolerance called out on a print for hole location, what is the industry standard?

Stuipd question but which industry?

I was always taught, without specs the tolerance was one tenth of every decimal place in each direction otherwise its the draftsmens fault when in doubt ask. Example .000 is +/- .001. or .25 could be .26 or .24.

BTW I hate GD&T its the bain of a maintenance mans existance who does not read prints every day.

chris

[mechanicaleng1]

I definitley do agree with CDLenterprises, usually on the print there is a box that gives standard dimensions, states "Unless other Wise Specified" I have not seen a company without this box on the corner and we deal with big high-end companies. CDLenterprises said that typically a three place is .005 (In.) and a two place is .010 (In.) for metric you would just convert from inches to metric units and vuala you have your specifications.

Good Luck

[pepo]

If there is truly no locational tolerance on the drawing the drawing is wrong. No such thing as "default positional tolerance." You are guessing,stop,dont do it,warning,error.