Page:Practical Treatise on Milling and Milling Machines.djvu/131

Rh Milling Outline on Reverse Gear Plates on a No. 2 B Heavy Plain Milling Machine

These plates are used on the spiral head to support the intermediate, or reverse gear. Before milling, a hole is drilled at each end of the plate, and then several plates are strung on rods. The ends of the rods are allowed to protrude, and slots are cut in the vise jaws to receive them. When one side of the plates is milled, the vise is undamped and the plates are turned over, dropping the ends of the rods again into the slots in the vise jaws. The other side of the plates is then milled, producing the entire outline of several plates at two cuts and insuring duplication.

The outline is cut from the solid, and the material is steel, hence the cut is a heavy one. Lard oil or soda water is used as a cutting lubricant.