Draper D13/5A Petunjuk Manual - Halaman 16

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DEPTH SETTING Cont'd

2. All holes will then be drilled to the same

depth when the stop nuts

depth stop

as shown in Fig.24.

OPERATION

The following directions will give the inexperienced operator a start on common drill press operations.

Use scrap material for practice to get the feel of the machine before attempting regular work.

CORRECT DRILLING SPEEDS

Factors which determine the best speed to use in any drill press operations are:

Type of material being worked,

Size of hole,

Type of drill or other cutter,

Quality of cut desired.

The smaller the drill, the greater the required r.p.m. In soft materials the speed should be higher than for

hard materials.

DRILLING METAL

Use clamps to hold the workpiece when drilling in metal. The workpiece should never be held in the hand;

the drill may snatch the workpiece at any time, especially when breaking through. If the workpiece is

twisted out of the operator's hand, they may be injured.

The workpiece must be clamped firmly while drilling; any tilting, twisting or shifting results not only in a

rough hole, but also increases drill breakage. For flat work, lay the workpiece on a wooden base and

clamp it firmly down against the table to prevent it from moving. If the workpiece is of irregular shape and

cannot be laid flat on the table, it should be securely blocked and clamped using vee-blocks, clamps or a

machine vice.

contact the

Fig.24.

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