Clarke Metalworker CDP350V, Инструкция по эксплуатации и обслуживанию, Страница: 22 / 36

22
MECHANICAL VARIABLE SPEED (FIG. 23)
To increase or decrease the speed
when operating, raise or lower the
speed handle (1). The speed (rpm) is
displayed by the digital readout.
Use the table on page 23 to
determine the recommended speed
for the drill size you are using and the
type of material you are to drill.
Check the speed on the digital
speed read-out (2) while drilling.
DRILLING SPEEDS
Important factors when determining
the best drilling speed are:
• Material type
• Hole size
• Drill bit or cutter type
• Quality desired
Generally, smaller drill bits require greater speed than large drill bits. Softer
materials require greater speed than harder materials. See page 23 for
approximate recommended speeds for the workpiece material.
WARNING: DO NOT ATTEMPT TO CHANGE THE DRIVE SPEED WHEN THE
DRILL PRESS IS TURNED OFF.
DRILLING METAL
• Use metal-piercing twist drill bits.
• It is always necessary to lubricate the tip of the drill with oil to
prevent overheating the drill bit.
• All metal workpieces should be clamped down securely. Any tilting,
twisting, or shifting causes a rough drill hole, and increases the
potential of drill bit breakage.
• Never hold a metal workpiece with your bare hands. The cutting
edge of the drill bit may seize the workpiece and throw it, causing
injury. The drill bit will break if the metal piece hits the column.
• If the metal is flat, clamp a piece of wood under it to prevent
turning. If it cannot be laid flat on the table, then it should be
blocked and clamped.
DRILLING WOOD
• Brad point bits are preferred. Metal piercing twist bits may be used
on wood.