Portable Machine Tools.
applicable machine maintenance manual for specific
Care and Use of Equipment..
Care and use
of equipment common to machine shops is explained in
the following paragraphs.
presses, as shown in figure 2-1, are used to open,
enlarge, and to finish holes by drilling, reaming, boring,
counter-boring, countersinking, and tapping.
Many different types of drilling
machines have been built for handling different classes of
work to the best advantage. Some designs incorporate
great versatility in handling a wide variety of different
work pieces, while others facilitate the mass production of
duplicate parts. Many modern drilling machines are
numerically controlled; others are automatically cycled.
The horsepower of drilling machines may range from a
fractional horsepower for drilling small holes to as much
as fifty horsepower for driving a heavy-duty, multiple-
spindle drill head that is capable of drilling many holes
simultaneously. The following is a list of drilling machine
Upright drilling machine.
Sensitive drilling machine.
Radial drilling machine.
Turret drilling machine.
Multiple spindle and gang drilling machine.
(2) Operating procedures.
procedures. The following are general hole drilling
Figure 2-1. Drill Press