YT-72300
MECHANICAL MICROMETER
GB
1. measurement surfaces
2. micrometer frame
3. sleeve with lengthwise scale
4. rotary drum
5. friction clutch knob
6. main scale
7. crosswise scale
8. fixing clamp
Technical data
Measurement range:
0 - 25 mm (YT-72300)
25 - 50 mm (YT-72301)
50 - 75 mm (YT-72302)
75 - 100 mm (YT-72303)
Precision:
0.01
mm
Operating temperature: 5
O
C - 40
O
C / 41
O
F to 104
O
F
Humidity:
With no importance below 80% of relative humidity
Maintenance
The device should always be dry and clean (liquids may damage its moving parts).
The measurement surfaces should be cleaned with care, using a cotton cloth. Do not ever use gasoline, acetone or other solvents.
YT-72301
YT-72302
Preparation for work
Clean the measurement surfaces and the guide using a cotton cloth. Do not apply solvents and acids.
Verify the zero position and if necessary adjust it with the provided spanner, so that the „0” line on the drum is aligned with the horizontal
line of the scale. Attention! The drum may be tightened solely with the friction clutch knob until it functions. Do not tighten using the drum,
which may lead to distorted measurements.
Attention! Micrometers whose measurement range does not start with zero are equipped with a mandrel, whose length is engraved on it. It
will permit to verify the zero position.
Measurement method
The drum may be turned only when the fixing clamp has been unlocked. Separate the measurement surfaces to a distance which slightly
exceeds the width of the object to be measured. Then using the drum turn to adjust the distance roughly, and then continue tightening,
turning the friction clutch knob. Stop tightening when the clutch has engaged, when the further turning of the drum will not make the drum
turn. Read the result of the measurement in accordance with the measurement method presented in the drawing.
Attention! It is recommended to fix the object to be measured or the micrometer before the measurement has commenced. It will result in a
higher precision of measurements.
It is recommended to realise a couple of measurements in order to obtain an arithmetic average of the results.
YT-72303
TOYA S.A. ul. So
ł
tysowicka 13-15, 51-168 Wroc
ł
aw, Polska