Winches
Effort force to raise a load.
A winch is a mechanical device that is used to wind up or wind out a rope or wire rope.
Velocity Ratio
The velocity ratio can be calculated as
VR = R / r (1)
where
VR = velocity ratio
R = effort force radius (m)
r = load radius (m)
Effort Force
The force to raise a load can be calculated as
F = W / μ VR
= W r / μ R
= m ag r / μ R (2)
where
F = force (N)
μ = mechanical efficiency of the system (equal to one for an ideal friction-less system, a fraction less than one for real-world systems with energy losses due to friction)
m = mass (kg)
ag = acceleration of gravity (9.81 m/s2)
W = weight (N)
Example - Winch Effort Force
The effort force for a winch with small radius 5 mm and large radius 10 mm, efficiency 0.95 and load 1000 kg - can be calculated as
F = (1000 kg) (9.81 m/s2) (5 mm) / ((0.95) (10 mm))
= 5163 N
Winch Calculator
Related Topics
-
Dynamics
Motion of bodies and the action of forces in producing or changing their motion - velocity and acceleration, forces and torque.
Related Documents
-
Force
Newton's third law - force vs. mass and acceleration. -
Forces and Tensions in Ropes due to Angle
Reduced load capacities in ropes, cables or lines - due to acting angle. -
Polyester Polyolefin Ropes - Strengths
Polyester Polyolefin dual fiber 3-strand rope - minimum breaking strength and safe load. -
Polyester Ropes - Strengths
Polyester 3-strand and 8-strand rope - minimum breaking strength and safe load. -
Polypropylene Fiber Ropes - Strengths
Polypropylene fiber 3-strand and 8 strand rope - minimum breaking strength and safe load. -
Power
Power is the rate at which work is done or energy converted. -
Pulleys
Pulleys, blocks and tackles. -
Shackles - Safe Loads
Safe loads of shackles. -
Sisal Ropes - Strengths
Sisal rope 3-strand, minimum breaking strength and safe load. -
Wire Rope Slings
Sling angles and influence on capacity. -
Wire Ropes - Strengths
6 strand x 19 wire (6x19) - minimum breaking strength, safe loads and weight.
