Page:Practical Treatise on Milling and Milling Machines.djvu/85

Rh means of a worm and wheel, and Fig. 30 illustrates one where spur gears are employed in addition to bevel gears. Vertical Spindle Milling Attachments as built by us are divided into two classes, light and heavy. With one exception, all of our machines can be fitted with both light and heavy styles.

Fig. 28 shows a light attachment for the smaller sizes of machines, and Fig. 29 a heavy style for the same machines. Fig. 29 is also representative of a light style for the larger sizes of machines, the heavy style for these machines being shown in Fig. 30. The spindle nose of these attachments, except that shown in Fig. 28, is

Fig. 31

tapered, hardened and ground; provided with taper hole, and has a recess in end to receive clutch on arbor or collets. The outer end of the heavy-style (Fig. 30) attachment is provided with a bearing that is stiffly supported by the arm braces.

Compound Vertical Spindle Milling Attachment. The Compound Vertical Spindle Milling Attachment, shown in Fig. 31 is particularly applicable to a large variety of milling, because it can be set in two planes. (See illustrations). It is especially advantageous when it is desired to set the spindle at an angle to the table, as in milling angular strips, table ways, etc., for with the spindle in this position, the full length of the table travel is available, and an ordinary end mill, instead of an angular cutter, can be used for milling the angle.