HFRR by Koehler

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High Frequency Reciprocating Rig (HFRR) – A Condition Monitoring tool to measure Lubricity

The HFRR by Koehler Instrument Company, Inc. is a versatile computer-controlled apparatus for evaluation of the coefficient of friction and wear properties of materials under dry and lubricated conditions.

Conforms to the Specifications of:

ASTM D6079, D7688; ISO 12156; IP 450; EN 590; CEC F-06-A

HFRR by Koehler
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FEATURES

  • Variable Frequency from 10 Hz to 200 Hz via software
  • Wear scar measurement through digital microscope and software
  • Real time data acquisition of frictional force, coefficient of friction and temperature
  • Test specimen surface are polished to both sides as per the method.
  • User friendly software for operating test rig with different operating sequences
  • Fully computer-controlled test sequence
  • Easy on-site calibration
  • Proven repeatability and reproducibility
  • Rigidly built dedicated table-top rig with custom built Humidity controlled cabinet.

Specifications

Stroke20 microns to 2mm
Test Load1N to 10N through dead weights
Frictional Force0 to 10N
Temperature RangeAmbient to 150°C
Test Disc Size10 mm dia. x 3 mm thick
Test Ball Size6mm diameter

Figure:  Images taken at the end of testing as per ASTM D6079. a) wear track of DFA-19, b) wear scar diameter of DFA-19, c) wear track of DFB-19,  d) wear scar diameter of DFB-19.

Table 1. Referenced WSD Values for the DFA and DFB Reference Fluids

FluidTarget value, µmLower limit, µmUpper limit, µm
DFA-19361284438
DFB-19685632738

Table 2. WSD Measurements for both Reference Fluids using a Koehler HFRR

Fluid1st WSD, μm2nd WSD, μm3rd WSD, μmAvg ,WSD, μmRel. Std. Dev., %
DFA-19318317305.5313.51.8
DFB-19680648.5691673.22.7

Application Notes

High Frequency Reciprocating Rig

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