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Fixture self-production guide
A micrometer head is clamped to a fixture by its stem.
Although the three most popular clamping methods are
shown on the right, Mitutoyo only recommends the
Clamp Nut and Slotted Fixture methods for reasons of
minimal risk of the clamping action affecting the
spindle fit within the stem.
Clamp Nut method Slotted Fixture method Setscrew Clamp method
Mounting hole machining Mounting hole machining Mounting hole machining
tolerance: tolerance: tolerance:
To accept a 9,5-10 mm stem: To accept a 9,5-10 mm stem: To accept a 9,5-10 mm stem:
G7 (+0,005 to +0,020 mm) G7 (+0,005 to +0,020 mm) H5 (+0,000 to +0,006 mm)
To accept a 12-18 mm stem: To accept a 12-18 mm stem: To accept a 12-18 mm stem:
G7 (+0,006 to +0,024 mm) G7 (+0,006 to +0,024 mm) H5 (+0,000 to +0,008 mm)
Note: Ensure the face where the Note: Ensure the slot is free from Notes:
micrometer head locates on the burrs before inserting the head. 1) Suitable set screw sizes are
fixture is perpendicular to the M3x0.5 or M4x0.7
mounting hole axis within the 2) The mounting hole should be
limit 0,16 mm in 6,5 mm. countersunk 90° x 0.5 mm (or less)
to receive the stem.
When countersinking care should
be
taken to avoid stem deformation.
Maximum allowable loading
The maximum loading capacity of a micrometer head 1. Maximum loading to maintain accuracy specification
cannot be quantified since it varies according to the
clamping method, type of load applied (static or Micrometer head Maximum load
dynamic) and the operating conditions (used as a
feeding device or as a stop). Standard type 0.5mm spindle pitch models 39.2N/19.6N()
When the micrometer head is used as a measuring
Other types 0.1 mm, 0.25 mm spindle pitch models 19.6 N
instrument Mitutoyo recommends keeping the loading
limits as per the table on the right to maintain accuracy 0.5 mm spindle pitch models 39.2 N
(within 1 million manual rotations). 1 mm spindle pitch models 58.5 N
The result of tests to determine the static load needed
to cause catastrophic failure of the mounting or head Ultra-small/Small size models 19.6 N
(for small micrometer heads) is also given below for Non-rotating spindle models 19.6 N
reference.
Fine-feed models 19.6 N
() Ultra-small and small size models
2. Static loading test results
(148-104, 148-103)
Test conditions
After mounting micrometer heads by the three methods as described above, the test load (in direc-
tion ‘P’) was applied to each head using a properties of materials testing machine. As the test load
was increased the load at the time when the micrometer head failed or was pushed out of the
fixture was recorded.
Clamp nut method Slotted fixture method Setscrew clamp method
The micrometer heads failed at The micrometer heads were The setscrew failed at 0.69 to 1.08
8.63 to 9.8 kN load. pushed out of the fixture at 0.69 kN load.
to 0.98 kN load.
The prices listed are suggested retail prices (valid until 31st May 2013). Inch products and combined inch/metric products are generally intended 165
for sale to the United Kingdom only. All products to be sold to commercial customers. Therefore VAT is not included. Product illustrations are
without obligation. Product descriptions respectively capability characteristics are only binding when explicitly agreed upon. * Please contact
Mitutoyo for more information on delivery times. mitutoyo@mitutoyo-tools.ru
www.mitutoyo-tools.ru