Lateral surface of thread: 5.5 x 3.14 x0.71 = 12.2617 cm sq
Plastic grip coefficient : 20 kg/cm sq
Total grip force: 245.234 Kg/f
According to th ratio of pinions : Z=40 with Z80 ratio 2 , Z80 with Z17 ratio 4.7
Total load on rack single tooth: 245.234: 2 x 4.7 = 576.3Kg/f
Conclusion : 300mm STROKE, minium working pressure: 100bar. Piston diamter 50mm with limited switches
at both forward and backword position.