MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 2
blades in place.
Inserted teeth are more economical and convenient for
large-size cutters because of their reasonable initial cost and because worn
or broken blades can be replaced more easily and at less cost.
(12)Kinds of Milling Cutters.
(a)
Plain Milling Cutter (figure 24 on the following page).
The most
common type of milling cutter is known as a plain milling cutter.
It is
merely a metal cylinder having teeth cut on its periphery for producing a
flat horizontal surface (or a flat vertical surface in the case of a
vertical spindle machine). When the cutter is over 3/4 inch wide, the teeth
are usually helical, which gives the tool a shearing action which requires
less power, reduces chatter, and produces a smoother finish. Cutters with
faces less than 3/4 inch wide are sometimes made with staggered or alternate
right-and left-hand helical teeth. The shearing action, alternately right
and left, eliminates side thrust on the cutter and arbor.
When a plain
milling cutter is considerably wider than its diameter, it is often called a
slabbing cutter; slabbing cutters may have nicked teeth that prevent
formation of large chips.
(b)
Metal Slitting Saw Milling Cutter (figure 25 on the following page).
The metal slitting saw milling cutter is essentially a very thin, plain
milling cutter. It is ground slightly thinner toward the center to provide
side clearance. It is used for metal sawing and for cutting narrow slots in
metal.
(c)
Side Milling Cutters (figure 26 on page 61). Side milling cutters
are essentially plain milling cutters with the addition of teeth on one or
both sides.
1
A side milling cutter has teeth on both sides and on the
periphery. When teeth are added to one side only, the cutter is called a
half-side milling cutter and is identified as being either a right-hand or
left-hand cutter. Side milling cutters are generally used for slotting and
straddle milling.
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