MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
generally not power fed on this size machine.
The saddle slides on a
dovetail on the knee providing crossfeed adjustment.
The knee moves
vertically up or down the column to position the worktable in relation to
the spindle.
(c)
Floor-mounted Universal Horizontal Milling Machine.
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The basic difference between a universal horizontal milling
machine and a plain horizontal milling machine is in the adjustment of the
worktable, and in the number of attachments and accessories available for
performing various special milling operations.
The universal horizontal
milling machine has a worktable that can swivel on the saddle with respect
to the axis of the milling machine spindle, permitting workpieces to be
adjusted in relation to the milling cutter.
2
The universal horizontal milling machine also differs from the
plain horizontal milling machine in that it is of the ram type; i.e., the
milling machine spindle is in a swivel cutter head mounted on a ram at the
top of the column.
The ram can be moved in or out to provide different
positions for milling operations.
(2)
Ram-type Milling Machines.
(a)
Description.
The ram-type milling machine is characterized by a
spindle mounted to a movable housing on the column, permitting positioning
the milling cutter forward or rearward in a horizontal plane.
Two widely
used ram-type milling machines are the floor-mounted universal milling
machine and the swivel cutter head ram-type milling machine.
(b)
Swivel Cutter Head Ram-type Milling Machine (figure 2 on the
following page).
A cutter head containing the milling machine spindle is
attached to the ram. The cutter head can be swiveled from a vertical to a
horizontal spindle position, or can be fixed at any desired angular position
between the vertical and horizontal.
The saddle and knee are driven for
vertical and crossfeed adjustment; the worktable can be either hand driven
or power driven at the operator's choice.
c.
Major Components.
The machinist must know the name and purpose of
each of the main parts of a milling machine to understand the operations
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