To avoid breakage Keep your collets clean after each bit change. Wax the threads with parafin wax occasionally, this helps to tighten the grip on the bit. Cutting lengths should be as short as possible to accommodate length of cut. Cut material in several passes. (depth of cut should be no more than the diameter of the bit. except in foam) Keep the feed rate up and adjust the spindle speed lower. You should be making chips not dust. Always use oil when cutting metals. Use a larger diameter or a high speed steel bit. More flutes on a bit the better the finish / Less flutes on a bit the faster the feed rate. To avoid melting Make sure that your bit is not dull. Make sure that there is enough cutting edge length (CEL). Try a collant or air spray. Speed up the feed rate. Lower the spindle speed, not the feed rate. Use a single flute bit.

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