ESTIMATING THE SCALE ERROR OF A METAL TAPE BY A ROLLING METHOD

Test results are presented on two prototype systems having differing t ape-drive mechanisms for use with metal measurement tapes for determin ing the scale error. Two systems are proposed from these results for b alancing our the errors in measuring the scale due to deviations in th e tape thickness from nominal, which involve an improved tape drive me chanism. Formulas are derived for the minimum permissible diameters of the measurement disk, the guide rollers, and the optimum ratio of the diameters for the unwinding and winding tape drums.