Power Jacks C-Series - Manual (Page 9)

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Screw Jack Model 4 CM-010 CM-025 CM-050 CM-100
Capacity (kN) 10 25 50 100
Lead Screw 1
Diameter (mm) 20 30 40 55
Lead (mm) 5 10 6 12 9 18 12 24
Gear Ratios
Option 1 5:1 6:1 6:1 8:1
Option 2 20:1 24:1 24:1 24:1
Turn of worm for travel of lead screw
Option 1 1 Turn 1mm 2mm 1mm 2mm 1.5mm 3mm 1.5mm 3mm
Option 2 4 Turn 1mm 2mm 1mm 2mm 1.5mm 3mm 2mm 4mm
Maximum Input Power (kW)
Option 1 0.375 1.5 3 3.75
Option 2 0.19 0.375 0.55 1.125
Start up torque at full load (Nm) 2
Option 1 6.8 9.4 19.8 26.4 56.0 76.0 115.9 156.6
Option 2 3.0 4.1 8.7 11.7 25.5 34.7 60.5 81.9
Maximum Through Torque (Nm) 7
Option 1 20.4 59.4 168.0 347.7
Option 2 9.0 26.1 76.5 181.5
Static Efficiency 3
Option 1 0.236 0.339 0.201 0.302 0.213 0.314 0.206 0.305
Option 2 0.133 0.192 0.113 0.171 0.117 0.172 0.132 0.195
Dynamic Efficiency 3
Option 1 0.306 0.424 0.264 0.383 0.281 0.398 0.272 0.388
Option 2 0.194 0.268 0.167 0.242 0.172 0.244 0.190 0.271
Lead Screw Restraining Torque (Nm) 5 22 30 76 102 210 290 575 780
Worm Shaft Radial Load (N) 6 325 380 740 1000
Maximum Input Speed (rpm) 1800 1800 1800 1800
Gear Case Material Aluminium SG Iron SG Iron SG Iron
Weight (kg) - stroke = 150mm
Translating 3.0 8.3 19.5 36.0
Rotating 3.1 8.7 20.2 40.2
Weight (kg) - per extra 25mm
Translating 0.11 0.21 0.32 0.57
Rotating 0.05 0.11 0.19 0.36
Notes:
1. All metric machine screws have a trapezoidal thread form.
2. For loads of 25% to 100% of screw jack capacity, torque requirements are approximately proportional to the load.
3. Efficiency values for standard grease lubricated worm gear box and lifting screw.
4. All C-Series screw jacks have grease lubricated gearbox and lead screw as standard.
5. Torque required to prevent the lead screw or lead nut from rotating if no anti-rotation device fitted.
6. Radial force applied midway along worm shaft key at 90º to key.
7. Maximum transmittable torque through worm shaft, not through gear set.
Standard Performance
3