Page:Practical Treatise on Milling and Milling Machines.djvu/146

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Surfacing Face of a Grinding Machine Apron on a No. 3 Vertical Spindle Milling Machine

A vertical spindle milling machine is peculiarly adapted to work having a long projecting hub, or where it is necessary to surface off some part inside, such as in gear cases. The operation above is typical of such work, and shows a casting that must be milled all around the outside edge.

The casting is clamped in a special fixture, and a shell end mill is employed. The outline of the edge is followed by using the horizontal and transverse table feeds alternately for the different sides.