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Pratt & Whitney’s Solution for Measuring Bearings

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Pratt & Whitney’s Solution for Measuring Bearings
The lead tribology Metrologist of one NASA laboratory stated “The radial internal clearance and axial internal clearance kits for the Labmaster Universal will help further establish us as a very capable bearing research lab”.

This friction and wear research lab uses a Pratt & Whitney Labmaster to measure several critical precision bearings from 12 mm bore, 2000 rpm bearings used in the water recycling system of the International Space Station to 90 mm bore, 30,000 rpm turbopump bearings used on the Space Shuttle’s rocket engines. “We are getting more use out of the Labmaster than I actually anticipated… It is a great tool to correlate some of the precision roundness and form metrology work we perform. My interns are still amazed at how they can routinely dial it in to 2 millionths [0.05 microns] on our reference gage blocks.”

The Labmaster was designed with the operator in mind; simple controls allow an operator to eliminate cosine error by fine-tuning the position of measured artifacts. In most cases, even cosine or misalignment errors less than 1 micro-inch [0.025 microns] can be detected and eliminated. Pleased with the results of his bearing measurement projects, the lead Metrologist of the research laboratory intends to explore the full potential of the Labmaster, “I look forward to expanding the capabilities of this great tool even more!”

Originally designed for measuring ID/OD gages such as threads, plugs, rings, and blocks, the Labmaster is also fit for applications such as measuring optical components, gears, splines, film thickness, and API gages. Pratt & Whitney Measurement Systems offers on-site training and an assortment of Labmaster accessories to aid in these and other special measurement applications.

Labmaster Bearing Measuring Instrument - Model BM175, BM1000A, BM1000M
The Standard of Accuracy
The Labmaster Bearing Measuring Instrument (Model BM175, BM1000A, BM1000M) can measure a wide range of anti-friction bearings including tapered roller bearings, needle roller bearings, ball bearings, spherical roller bearings, and cylindrical roller bearings.  Easy to use and the most accurate bearing measuring instrument on the market today, the BM Series Labmaster Universal measures bearings used for the aerospace, automotive, and medical industry.  For the bearing re-manufacture and repair industry, the BM Series includes probes and fixtures for measuring axial internal clearance (axial play) and radial internal clearance (radial play). These accessories can also measure bearing wear and provide important failure analysis.

Bearing Characteristics that can be measured: 

  • Radial Internal Clearance (Radial Internal Play)
  • Axial Internal Clearance (Axial Internal Play / End Play)
  • Internal Diameter of Bearing (Inner Ring)
  • External Diameter of Bearing (Outer Ring)
  • Inner Raceway of Bearing
  • Outer Raceway of Bearing
  • Shield Thickness
  • Ball / Needle Bearing Diameter


Pratt & Whitney Measurement Systems
Pratt & Whitney Measurement Systems is a global supplier of ultra-precision metrology instruments, inspection gaging systems, and length measuring machines. Our comparator instruments incorporate the latest in laser and sensor technology allowing for fast and accurate measurements. Industry applications span across a wide range including, but not limited to: aerospace components, automotive parts, medical devices, thin film materials, roller bearings (tapered, cylindrical, spherical, needle), transducers, optical components, semiconductor devices, gear-spline-thread assemblies.

Calibration laboratory applications include: gage blocks, internal and external threads, national pipe threads (NPT), cylindrical plugs, pin gages, ring gages, dial / test indicators, length standards, taper gages, micrometers, calipers, snap gages, disc masters, API gages, thread wires, bore gauges, and your precision parts. Accredited by A2LA to ISO/IEC 17025:2005 (cert# 2629.01).