MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
anywhere on the overarm.
Small arbor supports give additional clearance
below the arbor supports when small diameter cutters are being used. Small
arbor supports can provide support only at the extreme end of the arbor, for
this reason they are not recommended for general use. Large arbor supports
can be positioned at any point on the arbor.
Therefore they can provide
support near the cutter, if necessary. The large arbor support should be
positioned as close to the cutter as possible, to provide a rigid tooling
setup. Although arbor supports are not classified, a general rule of thumb
can be used for arbor selection--the old reference type A is of a small
bearing diameter, and the old reference type B is of a large bearing
diameter.
NOTE
To prevent bending or springing of the arbor, you must install
the arbor support before loosening or tightening the arbor nut.
(9)
Size Designation. All milling machines are identified by four basic
factors: size, horsepower, model, and type. The size of a milling machine
is based on the longitudinal (from left to right) table travel, in inches.
Vertical, cross, and longitudinal travel are all closely related as far as
the overall capacity. However, for size designation, only the longitudinal
travel is used.
There are six sizes of knee-type milling machines, with
each number representing the number of inches of travel.
STANDARD SIZE
LONGITUDINAL TABLE TRAVEL
No. 1
22 inches
No. 2
28 inches
No. 3
34 inches
No. 4
42 inches
No. 5
50 inches
No. 6
60 inches
9
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