Questions tagged [gears]

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17
votes
3answers
37k views

Effective ways to drive a single shaft with multiple motors?

To head off the "why not use a bigger motor" question, I'm a high school mentor for an FTC (First Tech Challenge) robotics team, with a bit of a soft mechanical / hardware background. They're ...
7
votes
1answer
6k views

Involute gear curve when root diameter falls below base diameter

The answer to a question on involute gear curve calculations shows how the gear tooth curve proceeds as an involute calculation from the base diameter. If the pitch diameter is D = m.N where N is the ...
1
vote
2answers
90 views

Vertical gear shaft support

I have a question regarding how are the vertical forces on a spur gear shaft are supported. I am currently doing my undergraduate (in final year) and have only dealt with gearboxes where the shafts ...
43
votes
9answers
8k views

Is it possible for a bicycle chainwheel to have a fractional number of teeth?

Background In the world of bicycle motocross, also known as BMX racing, gearing is a hotly-debated topic. Since the bikes are all single-speed, gear ratio is a fixed number defined as ...
8
votes
5answers
5k views

How can I get a stepper motor to engage with a freely spinning wheel?

I'm working on a project that uses a strong stepper motor to power a wheel that needs to be able to "coast" freely at times. The motor is too stiff when not engaged, and along with my gearing ratio, ...
5
votes
4answers
3k views

How to simulate car acceleration

I am a high school physics student and I've been trying to simulate the acceleration of a car as it fully accelerates from rest, but I'm finding it's much harder than I thought. Here was my first ...
5
votes
1answer
2k views

Involute Gear Calculation

I've written a program to generate gears and write them to dxf files. I thought all was well until I looked at the mesh of two gears. From everything I've read there should be no backlash when the ...
3
votes
1answer
684 views

How to find angle of timing gears

I am trying to figure out how to calculate either the distance or angle of 2 Idler Gears in a Timing Gear Configuration like so: I have been able to eyeball things, so they are approximate. I would ...
2
votes
1answer
646 views

Gear coupling and clearance between pitch surfaces

I have a couple of spur gears (0.4 mm module, ISO8/AGMA9 precision, 24 and 120 teeth). I want to make their backlash as small as possible. But also I don't want them to jam. Where can I get the normal ...
10
votes
4answers
3k views

How are high gear ratios achieved in a small space?

I have a very basic understanding of how gears work, and while trying to learn more, I've run into a small point of confusion. If a 2:1 gear ratio is achieved by having twice as many teeth on one ...
4
votes
2answers
9k views

Advantages and disadvantages of bevel gears

What are the advantages and disadvantages of bevel gears? This is what I've already found: Advantages: possibility to change operation angle Disadvantages: must be precisely mounted shafts' ...
4
votes
2answers
2k views

Designing non-self-locking worm gear

I see that most worm gears are self-locking but I'm looking to make my own non-self-locking POM worm gear. It'll only be of module 1. Does anyone know what needs to be changed in order to make a self-...
3
votes
3answers
281 views

Torque and RPM calc

started by designing the gear meshing, and now I need to calculate some parameters to determinate if this meshing works for me. The system considers an electric motor, which technical parameters are: ...
3
votes
1answer
4k views

Reverse-engineering spur gears - do I have enough data to make a gear that will mesh correctly?

I'm trying to reverse engineer a set of spur gears that I have on a model RC car, but they are tiny, so there's a limit to what I can measure with my calipers. My plan is to create a new gear design ...
2
votes
0answers
58 views

Advice on spring launcher project

I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
0
votes
0answers
39 views

Is there an easy way to calculate carrier output of a planetary gear set which has two inputs?

Online I found many guides and videos on how to calculate outputs of a planetary gearset but all of them have only one input. But how can I calculate output speed of carrier if ring and sun gear are ...