Question

it is desirable to have the number of teeth in the driving sprocket above 25, so as to reduce

Answer 1

Roller chain sprockets engage chain drives in power transmission and conveyor systems, though sprockets can engage any perforated material. Chain drives can be highly efficient and reliable in applications with limited shock and torque loads, provided the drive is well maintained. Chain drives can produce a mechanical advantage as speed reducers/increasers, created by utilizing sprockets of varying sizes. While related to gears, a sprocket's main differences are that it never engages another sprocket directly and a sprocket's radial projections require a sloped profile for smooth chain engagement and release.