Move to other forum if this isn't the best one.
Look at this image:
Though it's not to scale, hopefully it conveys the idea. Why does this gearbox have these series of motors, instead of just going straight from a small gear on the motor shaft to a big one on the axle?
Why is a gearbox geared this way?
Re: Why is a gearbox geared this way?
Each stage provides more reduction.
Let's say that the motor (and the small shafts) has a diameter of 1, the large gears have a diameter of 2, and the big one on the axle has a diameter of 3.
If the motor directly drove the large gear on the axle, you would get 3:1 reduction - or a torque multiplication of 3.
As shown you get a reduction of 2*2*2*3:1 = 24:1.
Generally speaking, motors usually have a higher speed and lower torque than what you really need, especially as you go down in scale.
Let's say that the motor (and the small shafts) has a diameter of 1, the large gears have a diameter of 2, and the big one on the axle has a diameter of 3.
If the motor directly drove the large gear on the axle, you would get 3:1 reduction - or a torque multiplication of 3.
As shown you get a reduction of 2*2*2*3:1 = 24:1.
Generally speaking, motors usually have a higher speed and lower torque than what you really need, especially as you go down in scale.
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"We'll just set a new course for that empty region over there, near that blackish, holeish thing. " Zapp Brannigan
"We'll just set a new course for that empty region over there, near that blackish, holeish thing. " Zapp Brannigan
Re: Why is a gearbox geared this way?
Trying to avoid gears that are very small or very large & creating places where gears can be shifted. I'm sure there are more reasons.
Re: Why is a gearbox geared this way?
tl;dr: Torquesnoopy wrote:Each stage provides more reduction.
Let's say that the motor (and the small shafts) has a diameter of 1, the large gears have a diameter of 2, and the big one on the axle has a diameter of 3.
If the motor directly drove the large gear on the axle, you would get 3:1 reduction - or a torque multiplication of 3.
As shown you get a reduction of 2*2*2*3:1 = 24:1.
Generally speaking, motors usually have a higher speed and lower torque than what you really need, especially as you go down in scale.
Saves space. Small gears can be set to conform to limited space. One big conversion would require a big ass disk. Source: Legos and Erector Sets.op wrote:Though it's not to scale, hopefully it conveys the idea. Why does this gearbox have these series of motors, instead of just going straight from a small gear on the motor shaft to a big one on the axle?
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