MILLING ATTACHMENT The attachment consists of a right angle plate which is mounted on the cross slide in place of the compound rest. To this plate is mounted a vise which uses two square- head bolts to hold the work. The entire assembly may be swiveled 360 є on the cross slide, and the vise may be swiveled 45 є on either side of the vertical. This makes possible setting the work at any angle. A milling cutter is mounted in the lathe spindle nose and the work fed past it in any of the following three ways: 1. Regular lathe length feed. 2. Regular lathe cross feed. 3. Vertical hand feed by means of the crank at the top of the vise.
With the use of this attachment, the field of work possible on the lathe is greatly extended, since many light milling operations can be accomplished in the lathe instead of on a heavier, more expensive mill - ing machine. The milling attachment is used to cut slots, keyways, or flats on shafts or small pieces of work. Screw heads can be slotted and short length racks cut. OUTSIDE CALIPERS MEASURING INSTRUMENTS with a screw and adjusting nut for quick setting to size, whereas the firm joint calipers are set by tapping one leg against a solid object. (Not on the lathe bed.) Both types have their advantages.
The spring type is much preferred on small work, while on large diameter work, the solid joint type (because of stiffer legs) is better. n To set calipers to a diameter with the use of a scale, hold the scale in left hand and the caliper in the right hand, using the forefinger to keep one leg from slipping off the end of the scale and adjust the caliper (100) to the dimension required. Some mechanics become quite expert at setting calipers, acquiring a " feel " that enables them to set calipers to .005 of an inch. In many cases your work will be to reproduce broken parts, and the calipers can be set from the broken part.
Be certain, Outside calipers are used to measure the diameters however, that the part is not worn where you set tne of the work being turned There are three kinds: Spring calipers. Try the calipers at different points to see calipers (98), firm joint calipers (99), and micrometer if the piece is round, not egg shaped, and that you are not calipers or " mikes " (102). Spring calipers are provided calipering on the smallest diameter. When calipering a