Page:Practical Treatise on Milling and Milling Machines.djvu/137

Rh Surfacing Large Casting on a No. 4 B Heavy Plain Milling Machine

An excellent example of heavy, plain gang milling is shown in this illustration. The surface being milled is $15 1⁄2$" wide, and the casting is held in a special fixture.

The table is fed longitudinally against the direction in which the cutters revolve. As the cut is comparatively heavy, nicked tooth cutters are employed, and it will be noticed that the thrust is mostly toward the spindle nose.

For such work as this, where considerable power is required to drive the cutters, the Constant Speed drive machine is superior to the Cone drive type.