LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
contains a mechanism for vertical adjustment of the milling head but
utilizes the carriage and feed controls of the lathe to move the milling
head in the horizontal direction.
An indexing head is supplied with the
versa-mil and is installed on the headstock spindle of the lathe to permit
indexing the workpiece. Although the workpiece is mounted in a conventional
manner in the lathe, the headstock spindle is never rotated by power for
milling functions (figure 36 on the following page). Cutting is done by the
milling head of the versa-mil and is driven by the self-contained motor of
the attachment.
b.
Mounting of the Versa-Mil.
(1) General. The versa-mil is rigidly constructed and is designed to take
heavy cuts without chatter.
However, no tool can be more rigid than the
base on which it is mounted.
Care should be taken to ensure that the
carriage, compound rest, ram or tool arm on which the versa-mil is mounted
is solid, and that the mounting bolts in the base plate are pulled up tight.
NOTE
The versa-mil can be mounted on the milling machine,
shapers, planers, boring mills, and various other
types of machine tools. However, for this task, only
those areas concerning mounting the versa-mil on the
lathe will be covered.
(a) Gibs should be as snug as possible and still allow the necessary
movement.
Those gibs governing movements not necessary for the operation
being done should be tight to prevent movement and chatter.
(b) It is important that the workpiece be solidly supported to prevent
vibration and chatter.
If the workpiece is held between centers, they
should be tight against the work. Long pieces should be supported at the
point where the work is being done.
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