Milling Methods - Up and Down Milling Process


Milling Methods

There are two distinct methods of milling classified as follows:
1. Up-milling or conventional milling, and
2. Down milling or climb milling.


Know here: Milling Process - Definition and Principle

Up-Milling or Conventional Milling

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Up-Milling or Conventional Milling Diagram

  1. In the up-milling or conventional milling, as shown in the figure, the metal is removed in form of small chips by a cutter rotating against the direction of travel of the workpiece. 
  2. In this type of milling, the chip thickness is minimum at the start of the cut and maximum at the end of the cut. 
  3. As a result of the cutting force also varies from zero to the maximum value per tooth movement of the milling cutter. 
  4. The major disadvantages of the up-milling process are the tendency of cutting force to lift the work from the fixtures and poor surface finish obtained. But being a safer process, it is commonly used the method of milling.

Down-Milling or Climb Milling Process

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Down-Milling or Climb Milling Process Diagram

  1. Down milling is shown in the figure. It is also known as climb milling. In this method, the metal is removed by a cutter rotating in the same direction of feed of the workpiece. 
  2. The effect of this is that the teeth cut downward instead of upwards. 
  3. Chip thickness is maximum at the start of the cut and minimum in the end. 
  4. In this method, it is claimed that there is less friction involved and consequently less heat is generated on the contact surface of the cutter and workpiece. 
  5. Climb milling can be used advantageously on many kinds of work to increase the number of pieces per sharpening and to produce a better finish. 
  6. With climb milling, saws cut long thin slots more satisfactorily than with standard milling. Another advantage is that slightly lower power consumption is obtainable by climb milling since there is no need to drive the table against the cutter.

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