RAN
High precision pull-down chuck Ø 160 - 400 mm
■ Pull-down effect of inclined master jaws ■ Tongue & groove master jaws ■ 3 jaws
TONGUE & GROOVE
Application/customer benefits • 1st or 2nd operation of parts requesting close squareness and parallelism tolerances • For chucking parts • External clamping only RAN: Inclined master jaws with pull-down effect and TONGUE & GROOVE Technical features • Chuck only available with 3 tongue & groove master jaws • Clamping on raw diameters with carbide inserts, increases the pull-down effect thanks to the penetration into the workpiece • Central bore for coolant and / or air • Chuck body and internal parts case hardened Standard equipment Ordering example 3-jaw chuck 3-jaw chuck RAN 200 / A6 Mounting bolts or 3-jaw chuck RAN 315 / A8
Actual gripping force diagrams
140
120 100 140 160 180
120
250
100
80
200
250
400
60
80 60 40 20
315
160
200
F G
F G
40
F
F
160
20
0
1000
2000
3000 3500
5000
0
1000
2000
3000
4000
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 Axial jaw stroke (pull-down)
RAN 160
RAN 200
RAN 250
RAN 315
RAN 400
3 5
3 5
3 6
3 8 2
3 8 2
mm mm mm
1.25
1.25
1.5
Axial piston stroke
20 25 57
20 40 92
25 55
32 65
32 80
Max. draw pull
kN kN
Max. gripping force
125
150
185
Max. speed
r.p.m.
5000
4500
3800
3000
2200
Weight (without top jaws)
kg
10
17
31
54
95
Moment of inertia
kg·m 2
0.034
0.10 0.92
0.26 1.25
0.65 2.15
1.85
Top jaw reference mass
kg
0.58
3.6
Recommended actuating cylinders
Type
SIN-S 85 / 100 SIN-S 100 / 125 SIN-S 125 / 150 SIN-S 125 / 150 SIN-S 150 / 175
Id. No. RAN (Center mounting)
77383216
77383220
77383225
77383231
77383240
SMW-AUTOBLOK 476
SMW-AUTOBLOK 470
SMW-AUTOBLOK 335
94 SMW-AUTOBLOK
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