Machinery Repairman

Figure 7-39.—Involute gear cutter.
designed especially to mill the “head space” of
T-slots. T-slots are cut in two operations. First, you
cut a slot with an end mill or a plain milling cutter, and
then you make the cut at the bottom of the slot with a
T-slot cutter.
Figure 7-40.—Concave cutter.
7-25
Figure 7-41.—Convex cutter.
WOODRUFF KEYSEAT CUTTER. —A
Woodruff keyseat cutter (fig. 7-38) is used to cut
curved keyseats. A cutter less than 1/2 inch in
diameter has a shank. When the diameter is greater
than 1/2 inch, the cutter is usually mounted on an
arbor. The larger cutters have staggered teeth to
improve the cutting action.
GEAR CUTTERS.—There are several types of
gear cutters, such as bevel, spur, involute, and so on.
Figure 7-39 shows an involute gear cutter. You must
select the correct cutter for a particular type of gear.
CONCAVE AND CONVEX CUTTERS.—A
concave cutter (fig. 7-40) is used to mill a convex
surface, and a convex cutter (fig. 7-41) is used to mill
a concave surface.
CORNER ROUNDING CUTTER.—Corner
rounding cutters (fig. 7-42) are formed cutters that are
used to round corners up to one-quarter of a circle.
Figure 7-42.—Corner rounding cutter.