Page:Practical Treatise on Milling and Milling Machines.djvu/130

124 Milling Three Surfaces at One Setting

An example of light gang milling is shown in the accompanying cut. The two top surfaces and one end of the casting are being milled simultaneously by the use of two plain milling cutters, and a larger side milling cutter.

The two plain milling cutters are $2 1⁄2$" diameter, $1 1⁄4$" and $7⁄8$" wide respectively; and the side milling cutter is 8" in diameter. To equalize the cutting speeds due to the wide difference between the diameters of the cutters, the large one is made of high speed steel, and the small ones of carbon steel.

If only one or two pieces are wanted, this work can be done more speedily with an end mill, as it takes more time to set up and adjust the three cutters shown above than would be required for making special settings with an end mill.