Weight Lifting (systems)
Subject
Mechanical advantage is a term used to describe the act of moving an object with less force than its weight, which can be achieved using levers, gears, screws, hydraulics, sheaveblocks and/or pulleys of different diameter.
Each method offers a greater capacity (weight) or faster lift dependent upon the relative input and output radii or diameters.
Whilst the calculations in Weight Lifting refer specifically to the mechanical advantage associated with lifting heavy weights, these calculations also apply to mechanisms or parts thereof that apply a force to another part of the mechanism in order to move it or lock it in place.
Moreover, some of the calculation options also apply to enhanced movement if the radii are reversed (i.e. R<r), wherein the weight (or Force) factor (Fʷ) will be less than 1 and the velocity (or movement) factor (Fᵛ) will be greater than 1
Calculator
The weight lifting calculator includes eight calculation options (lift configurations) using the abovementioned systems or combinations thereof.
Weight Lifting calculates the following two factors:
Lift Factor; is a multiplier you use to identify the weight you can lift for any given input force
Velocity Factor; is a multiplier you use to identify the lift velocity or movement of the weight in comparison with that of the applied force
You simply multiply your applied force or movement (or velocity) by the appropriate factor
For help using this calculator see Technical Help
Weight Lifting Calculator  Options
The weight lifting calculator provides 9 different lifting systems some of which offer a better lifting factor and others that provide an improved speed factor.
Torque Pulleys
This system utilises a torque advantage via a large diameter input pulley and a smalldiameter pulley, to which it is attached, to lift the weight.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Sheave Block
This system utilises multiple cord drops between two similarsized multiroller sheave blocks that reduce the force required to lift any given weight by sharing the weight equally between each cord drop.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Differential Pulley
This system utilises a torque advantage via a large diameter input pulley and a small diameter output pulley, to which it is attached, to lift the weight, via a third detached pulley around which the outputcord is wrapped. The differential pulley system achieves a lesser mechanical advantage that the Pulley system, but benefits from the use of a continuous loop (pullcord).
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Worm & Wheel Pulley
This system utilises a torque advantage via a large diameter input pulley and a small diameter output pulley, to which it is attached, to lift the weight, via a third detached pulley around which the outputcord is wrapped. The input pulley is driven by a worm and wheel, which significantly improves the lift capacity by at the cost of speed.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Gears
This system utilises multiple large to small pairs or gears that connect a large input pulley to a small output pulley. Weight Lifting accommodates up to 5 gear pairs.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Screw Jack
This system achieves a very good mechanical advantage via a screw thread and a long turning handle but at the cost of speed, which is much reduced.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Lever
This system achieves a mechanical advantage via a long input leverarm verses a much shorter weight lifting arm.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Hydraulic Jack
This system achieves a mechanical advantage via an input force applied to a small diameter hydraulic cylinder and a much larger weight lifting cylinder, both of which are exposed to the same fluid pressure.
You enter: 
and the weight lifting calculator will provide: 


Weight factor

Velocity factor

Check minimum system requirements