The phosphor bronze is resilient and have a low coefficient of friction.
A worm drive.
Even slower
A worm or machine can be geared with worm gear to give it higher torque or to reduce rotational speed in the machine.
linear distance moved by the gear(worm,screw jack) for one rotation of the gear(worm,screw jack)
yes you can reverse worm and gear. A worm gear can rotate the worm, its based on the lead angle, pressure angle and co.efficient of friction between the pairs.
Worm gear
function , purpose , advantage and disadvantage of worm gear
In worm gears, an axle or shafts has a screw that connects with another gear. This system is used when you need to change the direction of motion and reduce speed
Sand mullers break up sand after it has been used in molds to facilitate sandcasting. By effectively breaking up the sand, it can be reused. The worm on a motor or on the "driven" side of the device will engage with a worm gear. The worm rotates continuously, and the spiral cut gears "worm" their way "along" the axis of the gear. The worm gear (or spur gear) engages with the worm and rotates continuously as well. Also, the worm gear will translate the rotary motion of the worm by 90 degrees. It is fairly easy to see how the unit works if you look at some pictures or drawings. Hey, how about some animation or video? Got a couple of links.
The general answer applies to this and other equipment or tools with similar drives. It goes like this. The worm gear is often machined onto the end of the rotor in the motor. The gear it drives, the worm wheel, is made of material that is not as hard and can fail more easily. If the tool jams up, it is better in the long run (read easier and cheaper) to replace the worm wheel rather than the worm itself. A similar tool with this drive setup is one of the high end Oster barber clippers.
A bevel gear is cone shaped with the gear teeth placed vertically along the periphery. A worm gear is barrel shaped with the teeth spiraling along the length like a screw.
Spur gears give 180 degree drive, and worm gears give 90 degree drive.