The Velocity Ratio (Force Ratio) is From the previous theory the force required at the thread is F = F L tan (β ± α) depending whether the load is being raised or lowered.

. P = pitch of the thread of the screw.

where W=.


. Here is how the Velocity ratio of differential screw jack calculation can be explained with given input values -> 3. 3) Effort required to raise a load of 1000N with the machine (take π = 3.


. laboratory screw jack in order to ascertain the force ratio (Mechanical Advantage), Velocity Ratio and Mechanical Efficiency of the machines at different loads. .

The Velocity Ratio of a simple screw jack formula is expressed as vratio = (2pi*l)/p or velocity_ratio = (2pi*Length of lever arm)/Pitch when multiplied by the length of the lever. Calculate the velocity ratio of a screw jack of pitch 0.

The experiment was done at different loads of; 450N, 400N, 350N, 300N, 250N, 200N, 150N, 100N and the Mechanical Advantage, Velocity Ratio and Mechanical.

M r = s e / s l = velocity ratio (1) where.

com and apply for jobarewagist. .


05s • Bearing friction factor: 0.
Efficency v/s load 2.
AIM: To find out velocity ratio, mechanical advantage and efficiency of a Screw Jack type of lifting machine.

1, Dongcheng Road, Chang An, Dongguan, Guangdong, China.

The Velocity ratio of differential screw jack formula is defined as the ratio of product of 2 times π multiplied to length of the lever arm to the difference of pitch of screw A and.

The effort force for a screw jack when neglecting friction can be expressed as. . The Load is F L A torque of FD/2 is required to turn the screw where D is the thread diameter.

The movement ratio (or velocity ratio) of a machine is defined as the ratio of the distance moved by the effort to the distance moved by the load. 33 500-200 Mechanical Advantage = Efficiency x Velocity ratio = 0. . They can be used to push, pull, tension, lock, unlock, tilt, pivot, roll, slide and lift or lower loads, anything from a few kilos to. A screw jack is a mechanical device that can increase the magnitude of an effort force. State whether the jack is likely to overhaul.

If a handle is used as shown with radius R then the effort is The Force.

. To obtain the velocity ratio of the machine.

To obtain the velocity ratio of the machine.


Gears B and D rotate at the same speed since they are keyed (fixed) to the same shaft.

150kN Cubic Screw Jacks, Model JTC150, Trapezoidal Screw Tr60x9, Ductile Iron Housing.