Specifications

58
58
Quick Guide to Precision Measurement
0.000
0.000
0.000
MAX
MIN
TIR (run-out) = Maximum - minimum
1.234
123.456
+ –
/
Reference
surface
3step
(GO/±NG)
5step
–NG GO1
Limit1 Limit2 Limit3 Limit4
GO2 GO3 +NG
–NG +NGGO
Upper-limit
tolerance
Lower-limit
tolerance
Nut mounting
Split-clamp mounting
Comparison measurement
When a measurement is required that is beyond the measuring range of
a particular gage head, so that an ‘absolute’ measurement is impossible,
a calibrated master gage (e.g. gage blocks) or master workpiece can be
used to subtract the greater part of the distance involved so that the head
only has to measure the difference between the workpiece and the master.
This ‘comparing’ of the size of a workpiece with that of a master gives
rise to the term ‘comparison measurement’. (See page 59 for a detailed
description.)
Measuring force
A force is produced when a workpiece is brought into contact with the tip
of a linear gage head and forces the spindle to retract against the action
of the return spring. This is known as the measuring force and is specified
in newtons (symbol N). As this force is spring-generated it increases with
spindle retraction.
IP Codes
IP54
Code digit Type of protection Degree of protection
5
Protected against
dust
Ingress of dust is not totally prevented, but dust that
does penetrate must not interfere with satisfactory
operation of the apparatus or impair safety
4
Protected against
splashing water
Water splashed against the enclosure from any direction
shall have no harmful effects
IP66
Code digit Type Protection guarantee
6 Dust-proof No ingress of dust allowed
6
Protected against
powerful water
jets
Water projected in powerful jets against the enclosure
from any direction shall have no harmful effects
Precision measuring terms
Nut and split-clamp stem mounting
Gage heads are mounted on a fixture or stand using the precision-machined
cylindrical stem. Stems can be any one of several standard diameters and
are either just plain or with a fixing thread at one end or the other.
All gages can be mounted using the split-clamp method which is suitable
for a range of applications, especially where small axial adjustments may
be required. However, care is needed to avoid over-tightening the clamp,
which could interfere with the spindle movement.
Those stems with a thread at the spindle end can also be mounted just
by using a nut to clamp them into a hole in a fixture. They can also use a
`thrust stem' (see page 33) that is clamped into a larger hole in a fixture
and into which the gage is screwed. Stems with a thread at the body end
can also use this method of mounting.
Zero set
The action of setting the measurement display to zero at the current
position of the spindle before making a measurement, which will then
be made relative to zero. This function is used when making an absolute
measurement relative to a reference surface, or when making a comparison
measurement relative to a master gage (or workpiece), although in the
latter case a calculation is necessary to add the size of the master to the
displayed value to get the true measurement value.
Preset
The action of setting the measurement display to a non-zero value at
the current position of the spindle before making a measurement, which
will then be made relative to this `preset' value. This function is useful in
comparison measurement because it can be used to eliminate the need
for calculation, which otherwise would be necessary, to get the true
measurement value if the display was merely zeroed before measurement.
Peak hold/TIR measurement
Allows switching to the measurement mode for maximum value, minimum
value, and run out value (maximum - minimum), in addition to the normal
measurement mode.
Tolerance judgment indication/output
Sets two (or four) desired tolerances for three (or five) stages. Judgment
results can be output to an external device.
BCD output
The displayed value can be output in Binary Coded Decimal format.
Digimatic output
Data can be output to various printers and statistical processing devices, such
as DP-1VR and MUX-10LF, using the Digimatic code (SPC) output format.
Communication via RS-232C interface
RS-232C allows communication with a personal computer. It allows not
only the reading of measured values but also data transmission to the
counter and remote operations, such as when changing various settings.
Direction switch
Selects the counting direction of (+) or (-), whichever is convenient with a
given direction of spindle movement.