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I work for VALEO since 1999 manufacturing Motor Wiper Systems and I've never found a method to inspect correctly the tip and root diameter or radius of our gear parts (pinion and wheel with spur or twisted teeth in plastic POM or worm in steel).

Most recently, we have used a caliper, but this method does not give satisfactory results (R&R > 30%). I would like to know if there are some other methods to inspect these dimensions, such as optical or LASER methods.

For your information, our modules are between 0.5 to 1.5 mm, the dimensions to inspect are between 8 to 65 mm and our tolerances for the tip or root diameter are between 50 to 350 μm.

Thanks for your answer.

Best regards,
C. LASSALLE

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