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Thimble Diameter Graduation Styles B
The diameter of a thimble greatly affects its usability and the fineness of Care is needed when taking a reading from a mechanical micrometer head,
positioning. A small-diameter thimble allows quick positioning whereas especially if the user is unfamiliar with the model.
a large-diameter thimble allows fine positioning and easy reading of the
graduations. Some models combine the advantages of both features by The normal graduation style, identical to that of an outside
mounting a coarse-feed thimble (speeder) on the large-diameter thimble. micrometer, is the standard. For this style the reading increases as the
spindle retracts into the body.
On the contrary, in the reverse graduation style the reading increases as the
spindle advances out of the body.
The bidirectional graduation style is intended to facilitate measurement in
either direction by using black numerals for normal, and red numerals for
reverse, operation.
Micrometer heads with a mechanical or electronic digital display, which
allow direct reading of a measurement value, are also available. These types
are free from misreading errors. A further advantage is that the electronic
digital display type can enable computer-based storage and statistical
processing of measurement data.
20 80
10 90
05 5 25 20 45 05
0 0 25 20
00
45 5 90 10
Normal Reverse 80 20
graduation style graduation style
Bidirectional
graduation style
Guidelines for Self-Made Fixtures
A micrometer head should be mounted by the stem in an accurately machined hole using a clamping method that does not exert excessive force on the stem. There
are three common mounting methods as shown below. Method 3 is not recommended. Adopt methods (1) or (2) wherever possible.
(Unit: mm)
Mounting (1) Clamp nut (2) Split-body clamp (3) Setscrew clamp
method
Face A
Points to keep 9.5 10 12 18 9.5 10 12 18 9.5 10 12 18
in mind
Stem diameter G7 G7 G7 G7 H5 H5
Mounting hole +0.005 to +0.020 +0.006 to +0.024 +0.005 to +0.020 +0.006 to +0.024 0 to +0.006 0 to +0.008
Fitting tolerance
Care should be taken to make Face A square to the Remove burrs generated on the wall of the M3x0.5 or M4x0.7 is an appropriate size for the
Precautions mounting hole. setscrew.
The stem can be clamped without any problem at mounting hole by the slitting operation. Use a brass plug under setscrew (if thickness of
squareness within 0.16/6.5. fixture allows) to avoid damaging stem.
B-100
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