25
en
Switching the gear setting
(figure 16).
With the gear switch, you can select the
speed and thus the torque.
Adjust the gear setting only when the
machine is at a complete stop or when the
motor is running down.
Set the switch to gear 1 to work at low
speed with high torque. This setting is suit-
able for drilling with large drill bit diameters
and for tapping.
Set the switch to gear 2 to work at high
speed with low torque. This setting is suit-
able for drilling with small drill bit diameters.
Fig. 16
Drilling capacity
in steel -
TCT/high speed steel
(core drill bits)
Drilling capacity
in steel - high speed
steel (HSS)
(twist drill bit)
Tapped hole
JMU 137 QW
(**),
JMU 137-2 QW
(**),
JMU 137 PQW
(**)
1. Gear
1/2 in – 1 3/8 in
12 mm – 35 mm
1/4 in – 5/8 in
6 mm – 16 mm
3/8 in – 9/16 in
M5 – M14
JMU 137 MQW
(**)
1. Gear
1/2 in – 1 3/8 in
12 mm – 35 mm
3/8 in – 11/16 in
10 mm – 18 mm
3/8 in – 9/16 in
M5 – M14
JMU 137-2 QW
(**)
2. Gear
–
1/16 in – 3/8 in
1.5 mm – 9 mm
–
Max. diameter
for reaming
Max. diameter for
counterboring
JMU 137 QW
(**),
JMU 137 PQW
(**)
1. Gear
≤ 5/8 in
≤ 16 mm
≤ 1 1/4 in
≤ 31 mm
JMU 137 MQW
(**)
1. Gear
≤ 11/16 in
≤ 18 mm
≤ 1 1/4 in
≤ 31 mm
JMU 137-2 QW
(**)
1. Gear
≤ 5/8 in
≤ 16 mm
≤ 1 1/4 in
≤ 31 mm
