A long shaft on an Okuma grows about 0.03 mm in diameter over the first hour, then settles. We set the tool cold. The first parts are small, the later parts are on size, and a restart after lunch is small again.
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Set the finish tool after a warm-up cut, or probe a diameter after the spindle has been turning, and expect the cold start to be the odd one. Chasing the first cold part with wear makes the settled hour oversized or undersized depending on which way you jumped.
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If the growth is repeatable, a warm-up part in the same material is cheaper than a pile of adjustments.
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0.03 mm that comes back after lunch is heat. Write the warm-up into the setup so the next shift does not rediscover it.
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Questions and answers were written on this account when they were published.
