a) A vertical two start square threaded screw of 100mm mean diameter and 20 mm pitch...

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a) A vertical two start square threaded screw of 100mm mean diameter and 20 mm pitch supports a vertical load of 18 KN. The axial thrust on the screw is taken by collar bearing of 250 mm outside diameter and 100 mm inside diameter. Find the force required at the end of lever which is 400mm long in order to lift or to lower the load -0.15& 1-0-20. a) A vertical two start square threaded screw of 100mm mean diameter and 20 mm pitch supports a vertical load of 18 KN. The axial thrust on the screw is taken by collar bearing of 250 mm outside diameter and 100 mm inside diameter. Find the force required at the end of lever which is 400mm long in order to lift or to lower the load -0.15& 1-0-20.