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No. 99MBC095A
3. DISPLAYS AND KEY OPERATIONS
3.2.11 Preset/Zero-set
This function is used to measure the difference between the workpiece and the reference gage
or to measure the workpiece that is larger than the measuring range of the LSM.
a) Preset
• In this system the operation of setting the reference gage dimension is called the
preset operation.
• This function is applied to measure the absolute dimension of a workpiece.
b) Zero-set
• Setting the reference gage dimension to “0.0” for the purpose of comparing it with a
workpiece dimension is called the zero-set.
• This function is applied to measure a deviation from the reference gage dimension.
c) Direction
Depending on the objective portion of measurement of a workpiece, the positive
direction (set as “0”) or negative direction (set as “1”) must be set.
If, for example, the shaded portion of D in the following diagram is measured, the
direction must be set as positive (0). If the highlighted portion (gap) of W is to be
measured for determining the workpiece dimension L, the direction must be specified
as negative (1).
D
W
L
Reference piece
Reference
lane
Workpiece
Workpiece
Set as positive (0) Set as negative (1)
• Preset operation takes about 1 second to determine the compensation value by measuring
the reference gage.
• Preset value will be ineffective if the segment or edge number is changed (Preset value is
unique to each segment or edge).
3.2.12 Mastering
• If the objective workpieces are high-precision gages that are machined successively, the
above described preset/zero-set values may need to be fine-adjusted to the master. This
fine-adjustment is called mastering.
After mastering, the total compensation value will be:
(Preset value/zero-set value) + (±Mastering value)
Setting a positive (+) mastering value allows the measurement of a workpiece OD to be
greater than the raw measurement, and setting a negative (-) mastering value allows the
measurement of a workpiece OD to be smaller than the raw measurement.
• Because no measurement is required for this mastering, the reference gauge is not required
either.
• Set the reference gage dimension with the preset function and perform mastering.
