MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
FIGURE 19.
FORM MILLING OPERATIONS.
l.
Woodruff Keyway Milling.
(1)
General. Keyways are machined grooves of different shapes, cut along
the axis of the cylindrical surface of shafts, into which keys are fitted to
provide a positive method of locating and driving members mounted on the
shafts. A keyway is also machined on the mounted member to receive the key.
The type of key and corresponding keyway to be used depends on the class of
work for which it is intended. The most commonly used type of key is the
woodruff.
(2)
Operation.
(a)
Woodruff keys are semi-cylindrical in shape and are manufactured in
various diameters and widths. The circular side of the key is seated into a
keyway which is milled into a shaft with a woodruff keyslot milling cutter
having the same diameter as that of the key (figure 20 on the following
page).
(b)
Woodruff key sizes are designated by a code number in which the last
two digits indicate the diameter of the key in eighths of an inch. These
digits precede the last two digits and give the width of the key in thirty-
seconds of an inch. Thus, a number 204 woodruff key would be 4/8 or 1/2
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