NT-C
High precision power chuck Ø 170 - 400 mm ■ Centrifugal force compensation ■ Closed center ■ 3 jaws ■ proofline ® chucks = fully sealed - low maintenance Application/customer benefits • For large batch production • Safe clamping due to centrifugal force compensation, for high speed machining and for fragile parts • Fully sealed, ideal for dry machining of castings and forgings or if high pressure coolant is used NT-C: TONGUE & GROOVE master jaws (American Standard) Technical features • Centrifugal force compensation • Constant gripping force with permanent grease lubrication • Center bore for coolant and / or air • Chuck body and internal parts case hardened • proofline® chucks = fully sealed - low maintenance Standard equipment
TONGUE & GROOVE
Ordering example 3-jaw chuck NT-C 215 / A6
s
3-jaw chuck
a l e
m a i
Mounting bolts
Actual gripping force diagrams
120 100 140 160 180 220 200 235
400
215
120
315
100
260
80
170
60
80 60 40 20
40
F G
F G
F
F
20
0
1000
2000
3000
4000
5000
0
1000 2000 3000 4000 5000 6000
Speed (r.p.m.)
Speed (r.p.m.)
Safety advice / danger of damage: When using taller / heavier jaws and / or clamping on a bigger diameter reduce draw pull / rotating speed accordingly.
The data in the diagrams refer to 3-jaw chucks, newly maintained according to their service manuals using SMW-AUTOBLOK K67 grease. The static and dynamic gripping forces have been measured using standard soft top jaws, placed in a position not exceeding the outer diameter of the chuck.
Technical data
SMW-AUTOBLOK Type Number of jaws Radial jaw stroke
NT-C 170
NT-C 215
NT-C 260
NT-C 315
NT-C 400
3
3
3 5
3
3 7
mm mm
3.6
4.6
6.3
Axial piston stroke Max. draw pull* Max. gripping force*
17 30 72
22 42
24 55
30 65
33 75
kN kN
112
150
180
210
Max. speed
r.p.m.
6500
6000
4800
4000
3200 112 2.15
Weight (without top jaws)
kg
13
25
40
68
Moment of inertia
kg·m 2
0.048
0.146
0.34
0.84
Recommended actuating cylinders
Type
SIN-S 100
SIN-S 100 / 125 SIN-S 125 / 150 SIN-S 125 / 150 SIN-S 150 / 175
Id. No. NT-C (Center mounting)
77187417
77187421
77187426
77187431
77187440
* For internal clamping reduce the draw pull by 30%.
on request: Tooling Standard Parts Catalog
SMW-AUTOBLOK 466
SMW-AUTOBLOK 468
SMW-AUTOBLOK 325
70 SMW-AUTOBLOK
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