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Examples for differential / reference measurement:
R = Reference instrument, connected to port "B"
M = Measuring instrument, connected to port "A"
Rectangularity resp. parallelism of machine spindle in relation to work table (Fig. 7).
For precise square measurements an angular model fitted with magnets in the vertical face should be used.
(Elimination of deformation due to manual pressure).
Straightness of table motion (Fig. 8) in relation to the machine’s base. The table must be moved step by step
and the measured value at each step should be noted/recorded after stabilisation only.
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