MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
crank on the index head.
Proceed to mill the tooth or teeth in the same
manner as you would when milling a keyway.
n.
Drilling.
(1)
since the accurate location of the hole may be secured by means of the feed
screw graduations. Spacing holes in a circular path, such as the holes in
an indexing plate, may be accomplished by indexing the workpiece with the
indexing head that is positioned vertically.
(2)
Operation.
Twist drills may be supported in drill chucks that are
fastened in the milling machine spindle or mounted directly in the milling
machine collets or adapters. The workpiece to be drilled is fastened to the
milling machine table by means of clamps, vises, or angle plates. Remember,
proper speeds and feeds are important functions to consider when performing
drilling operations on the milling machine.
o.
Boring. Various types of boring toolholders may be used for boring on
the milling machine. The boring tool can either be a straight shank, held
in chucks and holders, or tapered shanks to fit collets and adapters. The
two attachments most commonly used for boring are the flycutter arbor and
the offset boring head.
The single-edge cutting tool that is used for
boring on the milling machine is the same as a lathe cutter bit. Cutting
speeds, feeds, and depth of cut should be the same as those prescribed for
6.
Milling Machine Adjustments
a.
Vertical Milling Machine.
(1)
Adjustments.
(a)
Proper gib adjustment procedures must be done after 40 hours on new
mills.
(b)
Each 700 and 800 series of mills have three gibs. One at the front
dovetail of the table, one on the left dovetail of the saddle, and one on
the left dovetail of the knee.
Each gib is supplied with two lock or
adjustment screws. The table gib has a
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