Page:Practical Treatise on Milling and Milling Machines.djvu/135

Rh Surfacing Bottom and Sides of Milling Machine Vise Base on a No. 4 B Heavy Plain Milling Machine

The possibility of milling the deep sides of a casting, and at the same time surfacing the bottom, is illustrated in this cut.

A special fixture is employed to hold the piece, which is supported on three pins and located in position against stops. Set screws at both ends of the fixture clamp the piece.

The two side milling cutters shown are 16 inches in diameter, and the nicked tooth spiral cutter in the middle is 4 inches in diameter.

Only one casting can be milled at a time, owing to the distance it takes for the large cutters to clear the work at the beginning and end of the cut.