Chain drive are not compact
Chain drives withstand heat dirt and weather exposure when properly lubricated
Cannot absorb shocks
Not useful for low speed and high load transmission
Quick return mechanisms is used
Rack and Pinion mechanism
Screw thread mechanism
Oldham's mechanism
Rack and pinion mechanism is used to convert the linear motion of the plunger of a dial test indicator to the rotary motion of the pointer
flexible
strong
Rurt proof
Leak proof
No change in viscosity due to variation in temperature
Reduce friction between mating parts
Take up the surface pressure between sliding parts
Becomes thicker after prolonged use
10 mm
100 mm
20 mm
200 mm