Smithy MIDAS MI-1220 LTD, Operator'S Manual, Page: 86 / 133

To cut bevels and chamfers, either move the workpiece into an angular cutter or hold the
workpiece at the desired angle while moving it into a plain cutter or end mill. You may
hold the workpiece in a vise or in a fixture held in a vise.
Squaring a Workpiece
To square the ends of a workpiece, use the peripheral teeth of an end mill. If you want
to remove a lot of material, use a roughing end mill first, then finish to size with a
regular end mill.
Plunge cutting is efficient for removing material quickly on low horsepower. Plunge the
end mill a predetermined width and depth, retract it, then advance and plunge it again
repeatedly. The maximum cutting force is in the machine's strongest (axial) direction.
Milling a Cavity
After laying out the outline of the cavity to cut, rough it out to within 0.030" of the
finished size before making finish cuts. Use a center-cutting end mill for the starting hole.
Tapping
Drill a hole. Then remove the drill bit and put a tap into the chuck. By turning the chuck
slowly by hand with slight downward pressure, you can get a perfectly threaded hole.
17: Milling
17-13
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