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Our company has historically dimensioned exclusively in english; our standard title blocks contain the typical Tolerances unless otherwise stated:.XX+.01.XXX+.005.XXXX+.0005 Lately we've had to produce more metric drawings or metric variants of existing drawings. Without using dual dimensioning, this raises questions regarding the title block standard tolerances. If you were to do a direct conversion, your title block would contain fairly silly tolerances:.XX+-0.25.XXX+-0.127.XXXX+-0.0127 In addition, in metric tolerancing trailing zeros are omitted. Thus, 0.240mm is written 0.24mm and then the decimal-place-specific standard dimensioning rubric becomes irrelevant. What's the proper way to specify title block tolerances in metric?

A single symmetric tolerance with every different tolerance specifically called out? RE: Metric title block tolerances (Mechanical) 8 Jan 08 16:34. Tdculbert, I set up our metric title block as follows. X = +/-0.5 X.X = +/-0.2 X.XX = +/-0.1 As you correctly noted, the ASME Y14.5M-1994 standard requires that you drop the trailing zeros from your metric dimensions. This messes up any scheme of controlling tolerances from the title block. Now, I set each tolerance on each metric dimension.

This is not a bad thing, and it does not take that long. The only people will be inconvenienced are the lazy slobs who apply default tolerances to everything. JHG RE: Metric title block tolerances. ASME Y14.5M-1994 1.6.1 (c) Where the dimension exceeds a whole number by a decimal fraction of one millimeter, the last digit to the right of the decimal point is not followed by a zero. 1-2 So you can’t simply have a 10mm rod with a block tolerance of +-0.1 by putting 10.000 which limits the usefulness of the block tol. In the UK where I worked we had a single block tolerance that didn't vary by decimal places. Typically this was +.25 although we changed it to suit the drawing.

Any dimension that varied from this had it's tolerance specifically called out (we usually showed limits not +-). Alternatively, there are horrible standards like ISO 2768 which you can invoke. For instance the last paragraph of the standard says: Quote. A.4 The tolerance the function allows is often greater than the general tolerance.

The function of the part is, therefore, not always impaired when the general tolerance is (occasionally) exceeded at any feature of the workpiece. Exceeding the general tolerance should lead to a rejection of the workpiece only if the function is impaired.

That said, it may be that the implementation of ISO 2768 I’ve seen makes it seem worse than it is. ASME Y14.5M-1994 doesn’t appear to directly say what to do about block tols for metric or inch but does reference ANS Y14.1 at para 2.1.1 (e). I believe this is now ASME and for metric you’d want ASME Y14.1M Metric Drawing Sheet Size and Format, I don’t have this standard. Sorry I couldn’t be more help. KENAT, probably the least qualified checker you'll ever meet. RE: Metric title block tolerances (Mechanical) 9 Jan 08 12:40. Tdculbert, just my opinions: Of course, dimensioning in metric isn't really supposed to be done using decimal places, hince the rule to not include insignificant zeros after the decimal place.

The ISO and ASME standards utilize a common tol table for metric dims. All you need to do is call out the class of tol you want on the drawing and reference the standard. Conax Software Decoder.