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Kunshan Crocodile Crusher

When we use to work with manganese bronze window extrusions, we found that for drilling you need to reduce feed and speed, brass and bronze has the habit of grabbing drill bits, you want to try and get a slow helix, negative rake drill bit, i know dormer sell them, if youre drilling large holes make sure you use a pilot drill this helps no end, its reduce the grabbing action, alot of the time.

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