Page:Practical Treatise on Milling and Milling Machines.djvu/152

146 Milling a Plain Surface on a No. 3 Vertical Spindle Milling Machine

It is advisable in milling castings such as that shown, to do the work on a vertical spindle machine, as it is much more convenient. If a horizontal spindle machine is employed, and the work is clamped to the table, plain cutters of unusually large diameter are required, and when a face milling cutter is used, the work must be clamped to a knee. This, too, is unhandy when the casting is somewhat unwieldy.

The piece of work illustrated is of cast iron, and it is fastened directly to the surface of the table by means of straps extending from step blocks to the casting and secured in place by bolts set in the table T slots.

The face mill employed has inserted teeth. The table may be fed longitudinally in either direction.