7
CHANGING SPEEDS
To change spindle speed, loose the slide bar.Bolts and pull cam handle
toward the front of the drill press Relocate belts on appropriate pulley rungs
for the required spindle speed. Push cam handle toward the motor and then
tighten the slide bar bolt. Check the belts for proper tension and make any
final adjustment.
Reference list of drill,Revolution and Various Mat
OPERATION
Use scrap material for practice to the feel of the machine before attempting
regular work.
1. Correct drilling speeds factors which determine the best speed to use in any of dill
or other cutter,and quality of cut desired. The smaller the drill the greater the required
RPM,in sift materials, the speed should be higher than for hard metals.
2. Drilling in metal use clamps to hold the work when drilling in metal.The work
should never be held in the bare hand,the lips of the drill may seize the work at any
time especially when breaking through the stock. If the piece is whirled out of the
operator 's hand.He may be injured firmly while drilling any tilting twisting or shifting
results not only in a rough bole, but also increases drill breakage.For flat work, lay the
piece on a wooden base and clamp it firmly down against the table to prevent it from
turning. If the piece is of irregular shape and cannot be laid flat on the table it should
be securely blocked and clamped.
3. Boring in Wood Twist drills, although intended for metal drilling may also be used
