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INTERAPI D 3 1 2 D i a l T e s t I n d i c a t o r s

INTERAPID 312 lever dial test indicators

INTERAPID 312 Dial Test Indicators very large measuring span – Ideal for inspec-
ting all significant size variations, e.g. on the surface plate – Measures position,
form and shape errors.
–– Safe reading thanks to secondary pointer totalling the number of revolutions

made by the main pointer.
–– Bidirectional measuring with automatic reversal within the movement.
–– Pointer rotation direction is always constant due to automatic reversal effect.
–– Jewelled movement with rubies.
–– Ball-bearing lever system. Measuring insert swivelling through 210°.
–– Particularly robust due to full-metal construction.
–– Monobloc housing with mounting through dovetail clamping and a Ø 4 mm

swivelling shank.

Standard Model Perpendicular model
Time-tested dial test Dial test indicator with dial
indicator. The dial face is face mounted at right angle
mounted parallel to the to the axis of the insert.
axis of the insert.
Stylus insert with angular position of 12°
All models INTERAPID 312 are designed to give a 29
true reading when the angle between the stylus and
the workpiece surface is 12° (Fig. A). ø4
In any other measuring position, including parallel 16,5
position of the stylus against the workpiece surface, ø 37,5 96,5
measured readings have to be corrected accordingly ø 30
(Fig. B). Please consult the instruction manual on
this subject.

67,5

~16

Measuring Permissible limits of a metrological characteristic (MPE/MPL)
A direction
0,01 mm 0,002 mm
Measuring Pointer revolution Pointer revolution
B direction
Deviation range over partial 1 2 12
Measuring measuring range, fe 10 µm 20 µm 4 µm 8 µm
B direction Total deviation range,
fges 13 µm 23 µm 6 µm 10 µm
Repeatability limit, fw
3 µm 1 µm

Max. hysteresis, fu 3 µm 2 µm

Measuring force 0,12 N 0,25 N

G-7