Quick Guide to Precision Measuring Instruments

PG14Maximum Loading Capacity on Micrometer HeadsThe maximum loading capacity of a micrometer head depends mainly on the method of mounting and whether the loading is static or dynamic (used as a stop, for example). Therefore the maximum loading capacity of each model cannot be denitively specied. The loading limits recommended by Mitutoyo (at less than 100,000 revolutions if used for measuring within the guaranteed accuracy range) and the results of static load tests using a small micrometer head are given below.Test methodMicrometer heads were set up as shown and the force at which the head was damaged or pushed out of the xture when a static load was applied, in direction P, was measured. (In the tests no account was taken of the guaranteed accuracy range.)1. Recommended maximum loading limit2. Static load test for micrometer heads (using MHS for this test)(1) Clamp nut (2) Split-body clamp(3) Setscrew clamp PClamp nutSplit-body clampPSetscrewPMaximum loading limitStandard type(spindle pitch: 0.5mm)Up to approx. 4kgf *High-functionality typeSpindle pitch: 0.1mm/0.25mmUp to approx. 2kgfSpindle pitch: 0.5mmUp to approx. 4kgfSpindle pitch: 1.0mmUp to approx. 6kgfNon-rotating spindleUp to approx. 2kgfMHF micro-ne feed type (with a differential mechanism)Up to approx. 2kgf* Up to approx. 2kgf only for MHTMounting methodDamaging / dislodging load*(1) Clamp nut Damage to the main unit will occur at 8.63 to 9.8kN (880 to 1000kgf).(2) Split-body clampThe main unit will be pushed out of the xture at 0.69 to 0.98kN (70 to 100kgf).(3) Setscrew clamp Damage to the setscrew will occur at 0.69 to 1.08kN (70 to 110kgf).* These load values should only be used as an approximate guide.Inside Micrometers

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