2 - 190 Conversational Part Programming v546CO WinMax Lathe Conversational Part Programming
Climb Milling
Climb milling is the preferred method of cutter compensation, except when the fixturing
is not rigid. In climb milling, the tool cuts in the same direction as the feeding motion,
and the first tooth contacts the workpiece at the top of the cut. The width of the chip
decreases from the maximum as the cutter removes material. This is also known as “in–
cut” or “down milling.”
The advantages of using climb milling are as follows:
• The chip starts thick and allows easy penetration into the surface of the part,
causing less tool wear and less power consumption.
• The tool force cuts in and down on the part, helping to hold the part in the
fixture. The more rigid the fixture, the better the hold on the part.
• Chip removal is greater, and there is less re-cutting of chips or marring of the
part surface.
• The cutting fluid is more accessible to the cutting surface.
Conventional Milling
Conventional milling is used when the fixturing is not rigid. During conventional milling,
the cutting teeth move in the opposite direction to the feeding motion, and the first tooth
contacts the workpiece at the bottom of the cut. The width of the chip starts at zero and
increases as the cutter removes material. This is known as “out–cut” or “up milling.”
The advantages of using conventional milling are as follows:
• The chip thickness starts at zero, causing less impact on the cutting teeth.
This is ideal for setups that are not very rigid.
• The backlash in older machines is greatly diminished.
The programming sequence of Lines and Arcs segments determines
the cutting direction.
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