Pratt & Whitney Length Measuring Machine

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Features

The Standard of Accuracy Pratt & Whitney Metrology Laboratory Measuring Machines are the standard of accuracy to which all other gauges are held subordinate.
They are certified traceable to the National Institute of Standards and Technology (NIST) and represent the only dependable, commercially available, absolute reference system for long length measurement.
When describing accuracy, the only meaningful definition must include all elements of the measurement system, from the transducer to the operator's influence.
These instruments perpetuate this “Standard of Accuracy” set by Francis Pratt and Amos Whitney over 130 years ago and, as such, deliver time-tested reliability and accuracy.
Systems are offered in standard lengths to 120 inches, available with either our Electrolimit or laser-based transducer, both easily measuring length, diameter, pitch diameter, roundness, parallelism and taper.
The Electrolimit® based measuring instrument utilizes a precision graduated master bar and maintains a nonaccumulative accuracy throughout the measuring range.
Our most recently developed laser-based measuring instrument provides laser interferometric measurements over the range of the system while utilizing a single master.
Simple, Flexible and Fast Both models are easily mastered.
The Electrolimit-based version is mastered by aligning the measuring head optically with the appropriate graduation on the NIST traceable inch bar.
This value is then preset on the digital display and the part to be measured then placed on the elevating table located between the anvils.
Finally, the measuring head is advanced until the analog meter indicates zero and the absolute measurement observed on the digital display.
The laser-based measuring instrument is mastered throughout its entire measuring range by inserting a calibrated gauge block between the anvils, advancing the positioning head until the analog meter indicates zero, and then presetting the gauge block value in the laser measurement display.
The part to be measured is then placed on the elevating table between the anvils and the positioning head and advanced until the analog meter indicates zero.
The absolute measurement can then be observed on the laser measurement display.
Gauge management
Pratt & Whitney's Gauge Management Software Program puts the history of all gauge functions at your fingertips, making QA management easier than it's ever been before.
It includes a full range of options for gauge measurement, operation sequencing, automatic comparison with standards and tolerance specifications, and storage and retrieval of measurement.
It is also capable of printing calibration tables and certification gauge recall and recalibration scheduling, calibration histories, and gauge management reports.

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