The worm gearbox utilizes a large diameter warm wheel. A worm or screw meshes with teeth to the outer circumference from the gearbox. Guide transmission gearboxes have a clutch that engages and disengages the motor through the gearbox, as well as a equipment change lever that selects diverse gears. https://gregoryoomkg.elbloglibre.com/33762032/gearbox-fundamentals-explained