DRILL PRESSES

Many sizes and styles of drilling machines or DRILL PRESSES are in use today-each designed for a particular type of work. Only the drill presses not covered in Tools and Their Uses, NAVEDTRA 10085-B2, are discussed here.

One type of upright drill press is the SENSITIVE DRILL PRESS (fig. 12-15). This drill is used for drilling small holes in work under conditions where the operator must "feel" what the cutting tool is doing. The drill bit is fed into the work by a very simple device-a lever. These drill presses are nearly always belt driven because the vibration caused by gearing would be undesirable.

Figure 12-15.-Sensitive drill press.

The RADIAL DRILL PRESS (fig. 12-16) has a movable spindle that can be adjusted to the work. This type of machine is convenient to use on large and heavy work or where many holes are to be drilled since the work does not have to be readjusted for each hole.

Check occasionally to make sure that all locking handles are tight and that the V-belt is not slipping.

Before operating any drill press, visually inspect the drill press to determine if all parts are in the proper place, secure, and in good operating condition. Check all assemblies, such as the motor, the head, the pulleys, and the bench, for loose mountings. Check the adjustment of the V-belt and adjust as necessary according to the manufacturer's manual. Make sure that the electric cord is securely connected and that the insulation is not damaged, chafed, or cracked.

While the drill press is operating, be alert for any sounds that may be signs of trouble, such as squeaks or unusual noises. Report any unusual or unsatisfactory performance to the petty officer in charge of the shop.

Figure 12-16.-Radial drill press.

After operating a drill press, wipe off all dirt, oil, and metal particles. Inspect the V-belt to make sure no metal chips are embedded in the driving surfaces.

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