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Machined Parts

Why do cracks form in some material when machining?

When machining polycarbonate, ABS, noryl and ultem, it is possible that after a period of time cracks are present that are not detectable at the time of machining. This is due to the existence of a natural sensitivity to stress cracking in conjunction with unfavourable machining conditions.
Recommendation:
When machining these materials, use air-cooling when possible or, if desired, use a water coolant. Coolants other than pure water may cause stress cracking due to chemical attack. Also, when carrying out extensive machining, you should machine in steps and perform a stress-relieving operation after rough machining.

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