Guarantee issued on master ring tolerance

Programme guarantees that master rings will be within the class ordered, or the ring will be replaced and full credit issued for the purchase price.

Mahr Federal has introduced a programme for customers who must ensure that their master rings are within the class (tolerance grade) they are manufactured to at the time of their purchase.

Under the Class Assurance Guarantee Program, Mahr guarantees that its master rings will be within the class ordered, or the ring will be replaced and full credit will be issued for its purchase price.

"For high precision manufacturers and especially those loss-of-life customers who manufacture for the aerospace, medical or military industries, having cylindrical masters meet specified class tolerance is critical", said George Schuetz, Director Precision Gauges for Mahr Federal.

"Yet too often, master rings purchased with certifications to class from vendors must be remeasured by the purchaser at time of receipt".

"Our Mahr Federal Class Assurance Guarantee Program is designed to eliminate the need for this expensive and time-consuming process".

Master rings are manufactured to classes based on tolerances to sub-microns.

Rings with the slightest errors at this level can influence the performance of manufactured parts.

"The programme also helps to ensure that master rings continue to meet class specification in subsequent calibrations", said Schuetz.

"Since the class is guaranteed at time of receipt, there is a reduced chance of measurement error at the next annual certification when it is too late to dispute the original class".

According to Schuetz, Mahr Federal can make this assurance guarantee because its metrology laboratory is ranked one of the world's finest.

All grand masters used in the Mahr Federal precision measurement centre have been certified by NIST for direct traceability to the standards of the USA.

The calibration system in the centre is certified to ISO 17025 under the NVLAP certification body.

Mahr Federal's master rings are ground and then lapped to size.

Ring faces are ground and all non-gauging areas black oxidised.

They are manufactured in accordance with Ansi specification B89.1.6-2002, and available in hardened steel, chrome plated or tungsten carbide.

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