Smithy MIDAS MI-1220 LTD, Operator'S Manual, Page: 74 / 133

Chapter 17
Milling
In milling, one or more rotating cutters shape a workpiece held by a vise or other
holding device. The cutters mount on arbors or at the end of the spindle in collets or
adapters.
Figure 17.1 MI-1220 LTD Milling/Drilling parts
Machinists use mills to machine flat surfaces, both horizontal and vertical, and to make
shoulders, grooves, fillets, keyways, T-slots, and dovetails. They can also make curved
and irregular surfaces and machine accurate holes. Its variety of machining operations
and high metal-removal rates rank the mill in importance with the lathe.
The millhead rotates 180 degrees and adjusts up and down. A quill that moves in and out
of the head carries the spindle.
You can move the table horizontally in two directions by turning the cross-slide and
long-feed handwheels The cross-slide handwheel turns the table longitudinally (at right
angles to the spindle axis); the long-feed hand crank moves it transversely (parallel to the
spindle axis).
To rotate the mill head, loosen the centering lock on the front of the mill head and the
mail lock on the back.
Millhead
(Rotates 180 degrees)
Crank Shaft
Main Lock
(At the back)
Centering Lock
17-1
Or Visit www.smithy.com