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4. When the belt has been correctly positioned, re-tension by levering the
motor away from the head until the belt deflects by approx 10 mm at its
centre when using reasonable thumb pressure.
5. Lock the motor in this position with the belt tension locking knob.
DRILL OPERATING SPEEDS
The table below gives the belt arrangement for given drilling speeds.
A similar chart is also located on the inside of the pulley cover.
The diagram shows the belts fitted to step 4 of the spindle pulley and step 1 of
the motor pulley, giving a speed of 300rpm.
S
PINDLE
P
ULLEY
A /
C
ENTRE
M
OTOR
P
ULLEY
B /
C
ENTRE
/
D
RILL
S
PEED
RPM
S
PINDLE
P
ULLEY
A /
C
ENTRE
M
OTOR
P
ULLEY
B /
C
ENTRE
D
RILL
S
PEED
RPM
1
1-A
D-4
300
7
4-D
C-3
1220
2
2-B
D-4
440
8
3-C
B-2
1250
3
1-A
C-3
460
9
2-B
A-1
1430
4
3-C
D-4
570
10
4-D
B-2
1750
5
1-A
B-2
650
11
3-C
A-1
1840
6
2-B
C-3
680
12
4-D
A-1
2250