Page:Practical Treatise on Milling and Milling Machines.djvu/87

Rh segments of circles, circular slots, etc., on plain and irregular shaped pieces. With the addition of one of these attachments, a vertical spindle milling machine is fully equipped for all varieties of straight

Fig. 34

and circular milling within its capacity. Likewise, one of these attachments used in connection with a vertical spindle attachment offers similar advantages on a horizontal spindle machine. Fig. 34 shows an attachment that can be used on our univfe-sal, plain and vertical spindle milling machines. The table is rotatecf by means of a worm and wheel, and can be fed automatically in either direction by power derived from the table feed screw. It can also be operated by hand when desired. For quick setting, the worm is thrown out of mesh and the table turned to any position. The table remains locked in position when the feed is stopped, but when straight milling or drilling is to be done, an additional clamp,

operated by a lever at the side of the attachment, is employed to further insure its stability. The table is heavy and has a wide bearing surface; its circumference is graduated to degrees. The base is provided with an oil rim.

A Circular Milling and Dividing Attachment is shown in Fig. 35. This attachment