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What collet hardness?

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  • What collet hardness?

    I have just machined up a replacement odd ball Chinese ER 25 collet from W1 to replace one accidentally lost. After hardening what should it be tempered to?
    Thanks, John.

  • #2
    Originally posted by machinist60 View Post
    I have just machined up a replacement odd ball Chinese ER 25 collet from W1 to replace one accidentally lost. After hardening what should it be tempered to?
    Thanks, John.
    Spring temper would be my guess. Should be a blue color, with w1 should be about 600f for a temper temperature

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    • #3
      Thanks epicfail48, that makes perfect sense.

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