LATHE OPERATIONS - OD1645 - LESSON 1/TASK 1
i. Milling and Grinding Attachment (Versa Mill). The milling and grinding
attachment (figure 24 on the following page) is a versatile, self-powered
attachment that fits to the carriage of the lathe. The attachment is used
for milling slots, flats, or keyways on lathe mounted workpieces, for
performing internal and external grinding operations, for drilling holes in
the periphery of lathe-mounted workpieces, for reaming and boring
operations, and for milling gear teeth and square tooth threads.
The
spindle of the milling and grinding lathe attachment is vertically
adjustable, riding on four shafts and controlled by a screw and a hand
wheel.
Different head accessories adapt to the attachment for performing
the variety of cutting functions mentioned previously.
Task 2 will give
more detailed information on this lathe attachment beginning on page 87,
paragraph 4a(1).
5.
Safety Precautions For Lathes
a. General. In machining operations, there is one sequence of events that
one must always follow:
SAFETY FIRST, ACCURACY SECOND, AND SPEED LAST.
With this in mind, let's look at some of the more important safety
precautions that should be observed before and during lathe operations.
b.
Lathe accidents are usually caused by:
(1) Loose clothing snagging on the revolving workpiece, the chuck, or the
workpiece.
(2) Flying chips entering the eye when turning cast iron or nonferrous
metals.
(3) Contact of the hands or arms with the lathe dog, chuck or workpiece.
c. The operator should prepare himself by rolling up his shirt sleeves and
removing watches, rings, and other jewelry that might become caught while he
is operating the machine.
d. The operator should be sure to wear safety glasses or a face shield of
the approved type at all times when operating a lathe or when in the area of
lathes that are in operation.
e. The operator should be sure that the work area is clear of obstructions
that one might fall over or trip on.
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