The power chuck attached to the spindle nose of a lathe is
actuated by a rotating hydraulic cylinder, its function is to
generate a gripping force to hold the workpiece to be
machined from the axial force generated by the actuating
cylinder. The power chuck is actuated by an axial movement
of the cylinder piston – transmitted by a draw tube (partly
open center or open center chucking) – to the chuck piston
of the chuck and is transmitted by the surfaces of the wedge
hook mechanism in the chuck piston to the correspondingly
shaped wedge guides in the master jaws which engage
during the gripping process.
| QPC175/3 | QPC210/3 | QPC250/3 | QPC310/3 | QPC400/3 | QPC500/3 | QPC630/3 | |||
| Quter diameter | A | mm | 180 | 206 | 257 | 315 | 400 | 500 | 630 |
| Bore | B | mm | 42 | 45 | 72 | 82 | 92 | 125 | 125 |
| Chuck mounting/Mounti ng recess |
C/E | mm | Z5/140 | Z6/170 | Z8/220 | Z11/300 | Z11/300 | 15/380 | 15/380 |
| Jaw mounting | D | F160 | F200 | F250 | F250 | F315 | F400 | F400 | |
| Pitch of serration | T | 4,8 | 4,8 | 6,0 | 6,0 | 7,0 | 8,5 | 8,5 | |
| Actuator | F | mm | 90 | 106 | 140 | 150 | 192 | 230 | 230 |
| Mounting bolts | G | M10 | M12 | M16 | M20 | M20 | M24 | M24 | |
| Thread mounting | G1 | M50x2 | M52x2 | M80x2 | M92x20 | M100x2 | M135x2 | M135x2 | |
| Chuck width | H | mm | 78 | 83 | 100 | 100 | 127 | 138 | 138 |
| Thread length | J1 | mm | 22 | 22 | 28 | 28 | 28 | 28 | 28 |
| Thread length | J3 | mm | 15 | 18 | 24 | 30 | 30 | 36 | 36 |
| Actuator stroke | K | mm | 20 | 20 | 23 | 23 | 28 | 33 | 33 |
| Pitch circle | L | mm | 104/8 | 133,4 | 171,4 | 235,0 | 235,0 | 330,2 | 330,2 |
| Jaw stroke | M | mm | 7,2 | 7,2 | 8,3 | 8,3 | 10,0 | 12,0 | 12,0 |
| Jaw width | Q | mm | 20 | 22 | 26 | 26 | 32 | 45 | 45 |
| Mounting recess | P | mm | 51 | 53 | 81 | 94 | 102 | 136 | 136 |
| Width | R | mm | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Weight | G | kg | 11 | 15 | 24 | 37 | 68 | 115 | 200 |
| Max.actuating | Fma | KN | 300 | 450 | 600 | 600 | 1000 | 1200 | 1200 |
| Max.gripping force | Fma | KN | 550 | 840 | 1200 | 1200 | 1950 | 2400 | 2400 |
| Max.speed | rpm | 7.000 | 6.300 | 4.500 | 4.500 | 3.300 | 2.200 | 1.700 | |
