MILLING OPERATION TYPE

                                                        MILLING OPERATION TYPE

MILLING OPERATION

v  Depending on the geometry of the cutter and the motion between the cutter and work piece , some basic type of milling operation are

ü  Up milling

ü  Down milling

ü  slab milling

ü  Face milling

ü  End milling

ü  Straddle milling

ü  Form milling

Up milling

•       Up milling is also referred  to as conventional milling. the direction of the cutter rotation opposes the feed motion. In this case the table moves towards the cutter, opposing the cutter direction.
  

Down Milling

• Down milling is also referred to as climb milling. the direction is some as the feed motion. For example, if the cutter rotates counterclockwise, the workpiece is fed to the right in down milling.
   
  
  

§                             The chip formation in down milling is opposite to the chip formation in the up milling

Slab Milling

• In slab milling , also called peripheral milling, the axis of cutter rotation is parallel to the workpiece surface to be machined. The cutter generally made of high speed steel, has a number of teeth along its circumference ,each tool acting like a single point  called a plain mill.

  Face Milling

•    It is often necessary to create a flat face on the large part. This can be done best using face milling. In face milling, the cutter is mounted on a spindle having an axis of rotation perpendicular to the workpiece surface.

 End miling

q  The cutter in end milling generally rotates on the axis vertical to the workpiece. Flat surface as well as various profile can be produced by end milling. The end faces of some end mills have cutting teeth, and these can be used as a drill to start a cavity.

Straddle Miling

• Two or more cutter are mounted on an arbor and are used to machine two parallel surface on the workpiece.

Form Miling

• Cutters with specially shaped teeth are used to produce curved  profiles, such cutters are also used for cutting gear teeth.