Can anybody help me out with dual dimensioning? I have an original print that is dimensioned in millimeters, but our QA department measures in decimal inches. So if I want to make a new print with dual dimensioning, how do I handle decimal places? Everything I've seen so far has the inch dimensions at one more decimal place than the millimeter dimensions. But how do I handle some tolerances then? For example, if the millimeter dimension is 1 +0/-0.1, how do I convert this to inches? One decimal place greater than the millimeter unit would be 0.0 +/-0.0. Or would it be one decimal place greater than the tolerance decimal places? This would give you 0.04 +/-0.00. But in order for it to make sense, I'd have to bring it out to 3 decimal places, so the inch dimension would be 0.039 +0.000/-.004.

So, how many decimal places are correct?