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Old 03-15-2012, 08:37 AM
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Dominik Dominik is offline
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
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Default notch effect

Okay, maybe my german-english translator failed me:

You polish metal parts to make them resistant agains notching (ie. from oil). A wider beam has a bigger surface to attract such failure ("Kerbwirkung").

Imagine the oil wasn't liquid but little knifes trying to dig into the metal.
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