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by Rigi on December 18th, 2008

Rigi

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Describe the 2 common methods of dimensinoning for darwing that must read in mtric or costumary measurrements.

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  • by JackofAllTrades on January 20th, 2009

    JackofAllTrades

    For multiple units (e.g. metric/standard on one print):
    Typically in blueprinting we use alternate dimensioning, in which the primary dimension style (metric or standard) would be presented, and either after or under that dimension the 'alternate' style (metric or standard) would be placed in parathesis.
    e.g. <--- 1" (2.5cm) ---->
    There are also other methods of dimensioning, one called 'baseline dimensioning' in which all the measurements are taken from one point in order to avoid 'round off' or accumlative errors, and standard dimensioning in which each dimension is measured from the previous dimension's endpoint. Of the two, I found baseline dimensioning was best for accuracy since the machinists tend to round off, and you never know how well their machinery is calibrated. For architectural blueprints, however, the contractors prefered 'standard' dimensioning, though that, too, could yield errors due to tape sag and electronic distance reader +/- errors.

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