RS, Professionally Approved Products, gives you professional quality parts across all products categories. Our range has
been testified by engineers as giving comparable quality to that of the leading brands without paying a premium price.
Cleaning and Basic Checking Procedure
Remove any oil, grease, dust or small particles which may cause damage to the micrometer or affect its
accuracy when taking measurements. Use a soft lint free cloth or paper together with a proprietary
instrument cleaning agent. Do not use acetone as this can damage parts of the micrometer
Before use check that the ratchet mechanism functions correctly
Check the spindle movement by using the ratchet stop to traverse the spindle though it’s complete
travel
Check that the measuring faces are in good condition
Check the locking mechanism works correctly
Zero Point Checking and Adjustment
Use the ratchet stop to move the spindle until it touches the fixed anvil. Allow the ratchet to turn 1 ½ to
2 revolutions for the final positioning
The zero point on the thimble should now coincide with the reference graduated base line on the sleeve
For micrometers above 25mm / 1” use the supplied setting standard or a gauge block to check the zero
position
If the zero point does not line up as required, it can be corrected by using the following procedure
When the zero point deviation on the thimble is under 2 divisions from the graduated base line
Turn the sleeve using the “C” spanner provided until correct alignment is achieved
When the zero point deviation on the thimble is over 2 divisions from the graduated base line
Hold the frame and the thimble and loosen the ratchet stop using the spanner provided
Disconnect the coupling of the thimble to the spindle by giving a light shock to the side of the thimble
Turn the thimble until the zero point is in alignment with the base line on the sleeve
Press the thimble against the spindle and re tighten with the spanner to achieve a positive coupling
Re check the zero position, any final small adjustment can now be made using the “C” spanner to re
position the sleeve to the thimble zero
Mechanical Thimble and Sleeve
Reading Example: Metric
When reading the micrometer ensure that your line of sight is directly above the graduated scale on
the sleeve and the thimble scale to avoid parallax reading errors
RS, Professionally Approved Products, gives you professional quality parts across all products categories. Our range has
been testified by engineers as giving comparable quality to that of the leading brands without paying a premium price
.
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