07-31-2012, 08:50 PM
Jerry,
I like to think of rake as something that controls the chip. It is the angle of the top of the tool relative to horizontal. Positive rake makes the cutting edge sharper and is used on soft materials like aluminum or brass (or wood). Neutral or negative rake is normally used with carbide on high horsepower machines. Side rake makes the chip flow left or right. Back rake combined with side rake can control how the chip curls or breaks.
Relief on the other hand simply provide clearance so the flank of the tool doesn't rub on the part.
Tom
I like to think of rake as something that controls the chip. It is the angle of the top of the tool relative to horizontal. Positive rake makes the cutting edge sharper and is used on soft materials like aluminum or brass (or wood). Neutral or negative rake is normally used with carbide on high horsepower machines. Side rake makes the chip flow left or right. Back rake combined with side rake can control how the chip curls or breaks.
Relief on the other hand simply provide clearance so the flank of the tool doesn't rub on the part.
Tom
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