22
en
Switching the gear setting (figure 13).
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 suitable 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 suitable for
drilling with small drill bit diameters.
Fig. 13
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
(**)
1. Gear
7/16 in – 1 3/8 in
11 mm – 35 mm
1/4 in – 5 8/8 in
6 mm – 16 mm
3/8 in – 9/16 in
M5 – M14
JMU 137 MQW
(**)
1. Gear
7/16 in – 1 3/8 in
11 mm – 35 mm
3/8 in – 11 16/8 in
10 mm – 18 mm
3/8 in – 9/16 in
M5 – M14
JMU 137-2QW
(**)
2. Gear
–
1/16 in – 3 8/8 in
1.5 mm – 9 mm
-
Max. diameter
for reaming
Max. diameter for
counterboring
JMU 137 MQW
(**)
1. Gear
≤ 5/8 in
≤ 16 mm
≤ 1 1/4 in
≤ 32 mm
JMU 137 MQW
(**)
1. Gear
≤ 11/16 in
≤ 18 mm
≤ 1 1/4 in
≤ 32 mm
JMU 137-2QW
(**)
1. Gear
≤ 5/8 in
≤ 16 mm
≤ 1 1/4 in
≤ 32 mm
OBJ_BUCH-0000000261-003.book Page 22 Thursday, January 11, 2018 5:30 PM
