Technical understanding - 2/3

What is the equation for mechanical advantage?

MA = Load/Effort

What is torque?

the turning effect in a rotary system

What is a linkage?

an assembly of parts to change the direction of motion mechanically

What is the equation for Velocity Ratio?

V.R = Distance of effort to pivot/Distance of load to pivot

What is the 2 equations for efficiency?

M.A/V.R and Work in/Work out

What is a pulley?

A simple machine that consists of a rope that fits into a groove in a wheel. There is a driven wheel and a driver wheel

What is the equation for velocity ration in a pulley?

diameter of driven/diameter of driver

How is speed calculated in a pulley?

speed of driver/V.R

What is a gear?

A gear is a wheel and axle with teeth around the wheel. 2 gears have a driven and a driver

What is a compound gear?

one or more gears on the same shaft allowing them to rotate in the same direction

What is the general equation for gear ratio?

output/input

What is the equation for gear ratio with gears?

Gear ratio = no. of teeth on the driven gear / the no. of teeth on the driver gear

What is the equation for output speed in a gear system?

Input speed/gear ratio

What is a module?

pitch circle diameter (mm) / No. of teeth

What is a rack and pinion?

A system to change between rotary and linear motion

What is a cam system?

a system involving a slide, a follower, a slide and a cam

What are the types of cams?

Circular, Pear, Snail, eccentric and heart shaped

What is a bearing?

a component which supports a motion and forces it to move in a certain motion with little friction

What is the formula for stress?

force/cross-sectional area

What is the formula for strain?

extention/original length

What is Youngs modulus?

the resistance of a material to elastic deformation under a load

What is the equation for Youngs modulus?

stress/strain

What is static force?

a force that does not change