New approach to measuring cutting wheels Application for measuring and evaluating cutting wheels presented at PWS Präzisionswerkzeuge GmbH Schmölln. In September 2011 a development project was successfully completed with PWS Präzisionswerkzeuge GmbH in Schmölln involving the measurement of cutting wheels and gear-cutting tools on the MarGear GMX 600 gear measuring station. PWS is one of the leading suppliers of gear-cutting tools, focusing in particular on hobs and cutting wheels for involute and synchronized gears, rack milling cutters and deburring tools for spur gears. In cooperation with esco GmbH, Aachen, Mahr offers the measuring technology for this entire product range. One of the basic requirements was to measure all the features on involute cutting wheels in accordance with DIN 1829, including an informative tooth thickness measurement. These measurements are based on parameterizing the cutting wheel geometry and allowing for the exact regrinding condition by recording the current tooth thicknesses. In addition to this basic requirement, Dr. Albert, Managing Director of PWS and development partner, wanted Mahr to come up with a solution for the quick and efficient measurement of special profiles, which can only be described using the disc shape used and the production parameters. This involved finding a solution which allows the disc geometries to be imported from the PWS database and the production parameters to be processed.
By entering the rake face and production parameters into esco's GearCuT software module, the computer can create an internal model of the cutting wheel geometry from which the measuring programs and measuring sequences can be automatically generated. Standard measurements according to DIN 1829 include: contour, pitch, tooth trace, tip clearance angle, axial run-out of rake faces, rake angle and rake face lead angle.
All profile measurements and measurements on the flank and back of the tooth are performed by continuous scanning behind the cutting edges or on the flanks. The automatic evaluation of all measurements on cutting wheels for involute tooth systems is performed according to DIN 1829 and the measuring records allow a quick and comprehensive assessment of the cutting wheel quality. Moreover, it is now possible for the first time to evaluate contour variations as a target/actual comparison within a specified tolerance band, be it a standard or custom cutting wheel. 
Contour scan behind the cutting edge of the cutting wheel profile 
Diagram of the contour variation on a selected tooth One of the major improvements in flexibility is that the inspector/PWS employee can carry out partial or complete measurements by selecting the features to be tested. Partial measurements can also be completed in stages.
The automatic archiving of the raw measuring data offers other advantages: subsequent studies and additional evaluations can be performed any time regardless of any new measurements, which is a major aspect of product development, optimization of production process and processing complaints. Numerical and graphic documentation conforming to standards is a matter of course with Mahr.   Evaluation record according to DIN 1829 Mahr's GMX 600 and GearCuT represent a comprehensive solution for the fast, flexible and accurate analysis and assessment of the quality of cutting wheels. PWS uses Mahr's tried and tested MarGear GMX 600 measuring instrument from the GMX range for all applications relating to gear tools. This combination of system and solution guarantees process reliability and maximum quality in the manufacture of cutting wheels and other gear cutting tools. | 
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