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9. SETTING THE BENCH DRILL
- 15 -
FIG.13
FIG.12
NOTE: Remove the plug from the socket before
carrying out adjustment, servicing or maintenance.
9.1 SPINDLE SPEED
ADJUSTMENT - FIGS. 14 - 17
This drilling machine is equipped with 12 drilling
speeds.Remove the pulley cover securing screw.
Select the speed most suitable for the intended
application†.
Loosen both the locking knobs and adjust the
motor tension lever releasing the tautness across
the drive belts. Move the belt to the corresponding
sections of the motor, intermediate and spindle pulleys
ensuring the belts remain horizontal.
Apply pressure to the motor tension lever to
tension the drive belt. With the correct tension
achieved. Tighten both locking knobs .
Gently lower the pulley cover before tightening pulley
cover securing screw. Never attempt to operate the
drilling machine with the pulley cover open or not fully
secured.
CAUTION: Over tensioning the drive belt will
accelerate belt wear, increase the loading on drive
bearings and the motor possibly leading to premature
failure. Under tensioning the drive belt will lead to the
drive belt slipping and increased noise.
†As a general rule material with a softer composition
can be drilled faster as they cut more easily. Harder
materials require a slower speed as attempting to
make the hole at a high speed will result in the drill bit
over heating which may result in a poorly finished hole,
the bit annealing or the bit breaking.
Drilling wood too slowly can cause splintering.
FIG.10
FIG.11
MOTOR
PULLEY
INTERMEDIATE
PULLEY
SPINDLE
PULLEY
A
B
C
D
E
1
2
3
4
1
2
3
4
5
Slow
1
Fast
12
Setting
1
2
3
4
5
6
7
8
9
10
11
12
Speed
180 min
-1
250 min
-1
300 min
-1
400 min
-1
480 min
-1
580 min
-1
970 min
-1
1,280 min
-1
1,410 min
-1
1,540 min
-1
2,270 min
-1
2,740 min
-1
Drive Belt Position
Spindle
A - 1
A - 1
B - 2
B - 2
C - 3
A - 1
E - 5
D - 4
E - 5
C - 3
B - 2
D - 4
Motor
4 - 4
3 - 3
4 - 4
3 - 3
4 - 4
2 - 2
4 - 4
3 - 3
3 - 3
2 - 2
1 - 1
2 - 2
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