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Quick Guide to Precision Linear Gauges
Measuring Instruments
Head Display Unit
Plain Stem and Stem with Clamp Nut Zero-Setting
The stem used to mount a linear gauge head is classified as a "plain type" A display value can be set to 0 (zero) at any position of the spindle.
or "clamp nut type" as illustrated below. The clamp nut stem allows fast
and secure clamping of the linear gauge head. The plain stem has the 0.000 0.000
advantage of wider application and slight positional adjustment in the axial
direction on final installation, although it does requires a split-fixture clamping 0.000
arrangement or adhesive fixing. However, take care so as not to exert
excessive force on the stem.
Presetting
Any numeric value can be set on the display unit for starting the count from
this value.
Stem locknut type Plain stem
Measuring Force 1.234 123.456
This is the force exerted on a workpiece during measurement by the contact Direction Changeover
point of a linear gauge head, at its stroke end, expressed in newtons.
The measuring direction of the gauge spindle can be set to either plus (+) or
Comparative Measurement minus (-) of count.
A measurement method where a workpiece dimension is found by +/–
measuring the difference in size between the workpiece and a master gauge
representing the nominal workpiece dimension. Datum plane
Ingress Protection Code
IP54 protection code
Type Level Description
G Protects the human body and 5 : Dust protected Protection against harmful dust MAX, MIN, TIR Settings
protects against foreign objects
The display unit can hold the maximum (MAX) and minimum (MIN) values,
Protects against exposure 4 : Splash-proof Water splashing against the enclosure from and MAX - MIN value during measurement.
to water type any direction shall have no harmful effect.
IP66 protection code
Type Level Description
Protection against contact with the 6: Dust tight Protection from dust ingress Runout value (TIR) = MAX - MIN
human body and foreign objects Complete protection against contact MAX
Protects against exposure 6 : Water-resistant Water jets directed against the enclosure from
to water type any direction shall have no harmful effects.
Precautions in Mounting a Gauge Head MIN
Insert the stem of the gauge into the mounting clamp of a measuring unit Tolerance Setting
or a stand and tighten the clamp screw.
Tolerance limits can be set in various display units for automatically indicating
Notice that excessively tightening the stem can cause problems with if a measurement falls within those limits.
spindle operation.
Open Collector Output
Never use a mounting method in which the stem is clamped by direct
contact with a screw. An external load, such as a relay or a logic circuit, can be driven from the
collector output of an internal transistor which is itself controlled by a
Never mount a linear gauge by any part other than the stem. Tolerance Judgement result, etc.
Mount the gauge head so that it is in line with the intended direction of
Relay Output
measurement. Mounting the head at an angle to this direction will cause
an error in measurement. Contact signal that outputs the open/closed status.
Exercise care so as not to exert a force on the gauge through the cable.
Digimatic Code
Precautions in Mounting a Laser Hologage
A communication protocol for connecting the output of measuring tools with
To fix the Laser Hologage, insert the stem into the dedicated stand or fixture. various Mitutoyo data processing units. This allows output connection to a
Digimatic Mini Processor DP-1VR for performing various statistical calculations
Stem Clamp screw Stem Clamp screw and creating histograms, etc.
Clamp Clamp BCD Output
Recommended hole diameter on the fixing side: 15 mm +0.034/-0.014 A system for outputting data in binary-coded decimal notation.
Machine the clamping hole so that its axis is parallel with the measuring RS-232C Output
direction. Mounting the gauge at an angle will cause a measuring error.
A serial communication interface in which data can be transmitted bi-
When fixing the Laser Hologage, do not clamp the stem too tightly. Over- directionally under the EIA Standards.
tightening the stem may impair the sliding ability of the spindle. For the transmission procedure, refer to the specifications of each measuring
instrument.
If measurement is performed while moving the Laser Hologage, mount it
so that the cable will not be strained and no undue force will be exerted
on the gauge head.
G-13
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