# Questions tagged [gears]

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### Example of Extremely Tiny Amount of Horsepower

I just took an exam and messed up the horsepower calculation acting on a pinion and got 0.059 hp (correct is 1.67 I believe). I should be fine grade wise I am simply curious about an example of ...
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### What kind of gear system is best for converting a lowering stone to rotation?

Say 100kg stone is lifted to 1 m. The stone is supposed to lose its potential energy in a way that it turns the gears as the stone moves down. What kind of gear system (or other system) would it be if ...
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### What are my options for intermittent motion gear system?

I have two gears (main is 48 teeth, driven is 20 teeth, module 0.3). The main gear is rotating in 1/3 of a turn increments, but I need to drive the second gear with only 12 teeth out of 16 of that 1/3-...
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### Transfering rotation to translation in most precise way?

i am trying to make a very precise machine which will use a very precise linear encoder (nm range) and very precise servo motor. I want to use servo motor rotation to precisely move a "thing"...
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### Idea of a continuous Gear system in Cars

Background I randomly had this idea and i was wondoring if could it be a better alternate technology than what we use in cars now, but as i have little knowledge in the enginnering field(i'm a physics ...
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### What is the mechanical advantage of this chain drive arrangement?

Trying to figure out if this has a mechanical advantage on moving a 600 pound car faster with less effort than just two using 2 gears
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### What is the general approach to having three hands on a clock all rotate on the same axis but at different speeds? [duplicate]

I want to build an art piece which would have three disks rotating all about the same axis at different speeds. Mechanically this would function just like a clock with hour, minute and second hands (...
59 views

### Power loss due to friction in gearbox

Suppose I have a gearbox to convert a high speed, low torque motor into a low speed, high torque output. Every time I add another non-ideal gear, there's an additional power loss due to friction and ...
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### What kind of motor can simulate weightlifting? (Difficult to move from locked; can rotate ever so slightly when force is applied)

Recently, I came across a product that is basically just an exercise mat with two cables for lifting on it. It markets itself as "digital weight", and can simulate weight up to 400 pounds. ...
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### Is there a formula to calculate the dynamic factor Kv for a single stage helical gear set?

I want to optimise my gearbox for dynamic factor Kv=< 1.1 Is there any equation to do so in excel from the power input, the macro geometry, etc.?
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### Profile and pressure angle definition in gear geometry

In gear geometry there are 3 main angles, which can be misleading: Profile angle Pressure angle Operating pressure angle Further for simplicity I would restrict the area of interest to "spur ...
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### Worm drive vs Cycloidal Drive

In robotics, I've seen quite a few people make use of cycloidal drives. They seem robust, compact and have a relatively simple design, while still achieving high reduction ratios. Yet outside robotics,...
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### What forces act ona key in a shaft during the work of spur gears?

What forces act on a key in a shaft during the work of spur gears? Are the forces which act on key only from the torque of shaft or also forces from gears mesh and work?
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### Geared Motor vs Direct drive with external gearbox

I'm looking to buy a small DC motor (~12W) which rotates at around 60rpm. I have two options: Get a geared motor which has an integrated gear box such that the output shaft rotated at 60rpm. Get a ...
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I'm trying to to teach myself to design gears for a hobby project, and I want to make a similar design. I typically use Autodesk inventor, but I was wondering if there was something better for this ...
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### Kinematic description of a gear rack moving around a cogwheel

I am facing some issues regarding the kinematic description of a gear mechanism (or maybe more accurately gear manufacturing process). Basically I would like to obtain an animation, where the cogwheel ...
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### Gearbox with cog shaped like a wizard hat? Conical gearbox variable transmission without belts?

5 axis drills can machine gears of arbitrary shapes, so I looked to see if there was a car speed box that runs a coned gear rather than 5 different gears, and there weren't any results. I know that ...
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### What's the easiest way to rotate a gear on a button press? [duplicate]

I need an extremely simple design for a mechanism that rotates a gear when a button is pressed, probably using a rack, but the gear cannot spin back while the button comes back up. I've tried using a ...
104 views

### How to make a button press into a gear spinning using a rack without gear turning back?

I need to have a rack attached to a button that when it gets pressed down, it spins a pinion. The rack then moves up with the button. The problem is that the gear will spin one way when the button is ...
70 views

### How do I find the optimal/best Gear ratios for an 3-speed transmission of an RC car?

[was told to post here, from physics stackexchange] Says it in the title - I've done a bunch of stuff so far, but my work seems to be wrong. I'm trying to build an RC car (pretty small, about 25 cm in ...
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### If I'm making an engineering drawing for a machinist, how do I define the undercut of a gear?

The drawing is of a small gear with an involute curve turning into a trochoid root causing an undercut. How do I define the undercut of this gear for a machinist?
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### Fixing center distance of worm gear

For a worm gear setup in a metal casing, is there a way to fix the center distance between the worm and the worm gear being too far away other than scrapping the casing and make a new one? Reference ...
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### What is the purpose of strange gear marks?

I'm now looking at a clutchless Hot Swapping Gear Mechanism. Each gear assembly consists of 5 gears: three main gears and two intermediate (transitional between two main gears). Each gear has unique ...
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### Epicyclic gearset with two suns and two planets

I'm developing an hybrid boat motor for an university project. Searching on the internet for some gearset under the instruction of my professor to not use internally toothed gear wheels, I found this ...
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### What are these flat surfaces on a worm gear's teeth for?

Does this affect the gear's performance?
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### Recommended fit/tolreance for multipeice crankshaft sections

I am designing a machine that will feature a multi-piece crankshaft. The crankshaft sections will come apart in order to slide the crankshaft through some mounted ball bearings. The fit I am aiming ...
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### Worm Gear Efficiency Loss

I am pairing a worm with a gear to tilt a cantilever load. I need to calculate the torque needed to drive the worm and would like to know the efficiency loss to expect due to the worm. How can I find/...
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### Gear systems' efficiency comparison

For a given system, that requires a shaft-gear(n)-shaft connection, which system's configuration would be the most efficient to use (in terms of total energy loss minimization). Where gear(n) is n ...
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### gear size selection for a compound gear system to fulfill a specific output ratio

I need help creating a compound gear system that will result in the sought after drive ratio or very close to it. Naturally gear teeth need to be whole numbers. Websites like 'GearGenerator' (dot-com) ...
1 vote
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### Remove slack from geared stepper - without touching the gearbox?

I have a Nema 11 stepper motor with a planetary gearbox and think it is a great stepper motor for a project I'm trying to do. One thing I noticed is that the output shaft of the gearbox has some ...
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### High torque timing belt

I'm building an automatic litter box for my kitty and I tried building two versions using a GT2 timing belt + pulley but the belt seems to slip from the pulley often (since it requires high torque) ...
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### 3-way differential

I am interested in finding a way to facilitate constant 6-wheel drive utilising a centre differential that splits the torque from the gearbox between the 3 axles while allowing them to vary in ...
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### "move fast until resistance encountered, then gear down" mechanism?

This question may be too general, so apologies in advance if that is the case. I'm looking for a (relatively simple) mechanical system that will cause the driven element to move fast under no-load ...
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### Gear setup for 12 V motor

I'm looking for a ring gear 8 - 10 inches in diameter and the small gear to turn it that will fit on a 12 V motor with a 6 mm - 8 mm in diameter spindle for this motor here. I've been searching for ...
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### Using a Lead Screw To Create a Two Stage Clamping System

I want to use a motor to drive a lead screw that first brings down a platform that locks into place and then controls a secondary platform to apply pressure but using only a single motor. As an ...
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### Is this a feasible way to straight-couple to a gear?

I have some car window motors that I would like to directly couple to some roller-type shades in my house. I would like to introduce a direct coupling mechanism rather than use some sort of chain. In ...
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### Finding rotation across a spring/elastic shaft

I have not yet seen a problem like this across any course I have taken, but am curious how to approach this. Say that you have a system like this: Here some torque is being generated at a motor, ...
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### Why are bulldozers so slow?

Tracked-type tractors and bulldozers are very slow engineering vehicles. Their top speed is less than 15 km/h and when pushing it is even lower (< 5 km/h). For example: the Caterpillar D9's top ...
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### Advantage to reduced diameter where a gear will mount to shaft?

I will be mounting a sprocket gear on the 2 inch input shaft to my custom piece of industrial machinery I am preparing. The sprocket gears are available in 1 15/16 and 2 inch bore diameter. Would ...
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1 vote
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### Ideas for running 2 gas engines to 1 shaft with pulleys

First time posting, but love the forum. Hopefully this hasn't been asked before. I could only find the question in relation to electric, not gas engines. I own a pressure washing business, and my ...
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1 vote
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### Why do high speed boats have 2 speed transmission?

For example in this link you can see a 2 speed gearbox for a high speed boat http://www.coanracing.com/custom-block2/transmissions.html/xtreme-marine-transmission.html , what even is the purpose of ...
1 vote
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### Half bidirectional transmission shaft gear box solve

I'm wondering how to accomplish some kind of gear box that would reverse only the direction of one side of the two shafts on it, like in the picture below.
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### Minimum torque required to turn a large gear

I want to preface this by saying that this isn't homework, it's just a question I've made up myself (so it could just be impossible to solve), and I am a beginner so apologies if I miss something ...
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### Bounce/Vibration in a Beam drive by Harmonic Reducer

I have a system that is set up in the following way a harmonic reducer with a beam attached (50:1) the direction of rotation is perpendicular to gravity the beam extends to both ends at an equal ...
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### How to design a gear decoupling system?

I'd like to convert my stupid door lock into a smart one. I already have a gear for the lock knob. Now I'd like to design a gear decoupling system that will be connected between the knob and the motor ...
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### Bending stress in gears

I have a double step up gearbox with two equal ratios gear pairs. Their the same modules and both gears have the same form factor as well as the pinions. With a input speed of 4000 and a output of ...
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### 2-speed 2-direction gearbox design

I need to design a gearbox with the following properties: The direction of rotation is maintained between the input and output shaft The input shaft can be rotated in one direction for one gear ratio ...
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### Input power unit for Heavy Duty spool hose

I'm trying to design a machine for spooling a hose at a mining application. Considering all hose length, mass, spooling diameter and pump the peak torque would be of To = 10267 Nm. It sounds a lot but ...