Set the micrometer in the setting ring gauge and set to nominal zero as shown in Fig. 3.
Locate the three point gauge on the calibrator between sides A & B and slip block C with sliding anvil E clamped in position by knob D (the size of slip block C is selected according to the range of instrument being calibrated).
i.e. 20mm for all ranges within 0-10mm
40mm for all ranges up to 25mm
Move the sliding anvil with slip block in position to generate the circle diameter equal to nominal bottom point on the range of the micrometer being calibrated. (Refer Fig. 1)
This can also be set by use of cylinderical block with nominal dia equal to the bottom end range of the head. See Fig. 2 and Fig. 4
When taking readings search for smallest value (up to 15 minutes practice is needed to achieve this with confidence).
Adjust the position of slider anvil E as necessary.
When nominal value of the lowest point is achieved clamp slider E firmly in position and set micrometer to nominal zero.(Refer Fig. 1)
Repeat measurement to ensure that the instrument reads zero within the repeatability of the system (overall .002mm with .001mm resolution). Reset micrometer to zero if necessary.
To take subsequent measurements on the range of the instrument, simply reduce the size of slip block C. For example if slip block is reduced by 15mm the increase in new ring generated size is equal to 15mm divided by 1.5 which equals 10mm.
To obtain 1mm step on the range of micrometer being calibrated the slip block size is reduced by 1.5mm, by using factor 1.5 any point on the range of the instrument can be checked.
Pl. note: The illustrations and specificatins may be changed without prior notice.
