![]() Positive inserts are sharper which aids in shearing the material. If the insert edges are angled upward it is likely a positive insert. Positive inserts reduce cutting forces and increase clearance.(Small flat portion of the insert that reduces the peaks left by the leading edge.) For this reason, a "wiper" can be utilized. The feed rate and number of revolutions needed to get from one end of the part to the other increase. Smaller tool nose radii decrease tool pressure and can provide better finishes.The rule of thumb is to remove no less than the tool nose radius for cut depth. Depth of cut is often extremely critical, especially cutting steel.A finishing insert will generally have similar characteristics whether machining super alloys, steels, or non ferrous materials like aluminum. ![]() Increasing depth of cut or feed rate can help break a chip, but that is not helpful when finishing. Stainless steels and superalloys require force to break a chip. Insert choice- harder metals require a balance between chip breaking capabilities and tool life longevity. How to achieve better finishing results in a lathe.ฤก.
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