6.
Blade speeds, gear selection, rules of thumb, sawing procedure, saw blades
6.1
Optimum cutting speed (blade peripheral speed): As a guide, most saw blade manufacturers, including Hilti, rec-
ommend a speed of approx. 40 m/sec. Depending on the situation (concrete quality, aggregates, reinforcement
etc.) speeds of 30-50 m/sec. may be used.
6.2
Recommended speed and gear (r.p.m. under load) - guide values
The guide values below are printed on the cover of the D-LP 30 (LP 20) and on the DS-CB 3 / CB-4 remote con-
trol unit.
9
D-LP 30 (LP 20) / DS-TS 30
Pos.
r.p.m.
∅
∅
∅
∅
∅
1
st
gear
10
900
500 wire saws
9
810
900
8
720
1000
7
630
1200
6
540
1500
1600
T = cm
38
43
53
68
73
D-LP 30 (LP 20) / DS-TS 30
Pos.
r.p.m.
∅
∅
∅
∅
∅
2
nd
gear
10
1800
9
1620
8
1440
600
7
1260
700
6
1080
750
800
5
900
900
T = cm
23
28
31
33
38
D-LP 30 (LP 20) / DD-750 HY
30 Ltr./min. 45 Ltr./min. 60 Ltr./min.
∅
mm
1
st
gear
97 r.p.m.
136 r.p.m.
194 r.p.m.
300–750
2
net
gear
180 r.p.m.
252 r.p.m.
360 r.p.m.
152–300
3
rd
gear
360 r.p.m.
504 r.p.m.
720 r.p.m.
77–152
4
th
gear
485 r.p.m.
678 r.p.m.
969 r.p.m.
52–112
The values from the table above give a theoretical cutting speed (blade peripheral speed) of approx. 35-45 m/sec.
The cutting speed for wire sawing is approx. 20 m/sec. and for core drilling approx. 2-6 m/sec.
Important
– Under difficult conditions, i.e. high steel content or hard aggregates, it is usually advantageous to run the saw in 1st
gear.
– Safety precaution: adhere to the recommended speed settings. The blade peripheral speed then remains within safe
limits.
Pos.
max. 6
Pos.
Pos.
Pos.
Pos.
Øm
m
T
Ø mm
DS-B
DS-W 11
T = max. cm
DD-BU
