Page:Practical Treatise on Milling and Milling Machines.djvu/151

Rh Milling Grooves in Rim of Pulley on the No. 3 Vertical Spindle Milling Machine

Here a vertical spindle machine equipped with a circular milling attachment is shown milling belt grooves in the rim of a three step pulley.

The pulley is easily fastened in place and a continuous cut is taken around the rim, using the automatic feed of the attachment. The knee is then lowered to bring the cutter at the right height for the next smaller step and the table is moved longitudinally to get the correct depth of cut. This operation is repeated for the smallest step and the piece is finished.

This operation can also be done on a horizontal milling machine when equipped with both vertical spindle and circular milling attachments.