# Questions tagged [gears]

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### Motor, a gearbox and a drum with a cable lifting a mass

A lifting device consists of an electric motor, a gearbox and a drum with a cable for lifting a mass. The speed after the initial acceleration is $v=0.5\,\text{m/s}$. The gear efficiency $\eta=0.7$ ...
21 views

### What is the top limit for torque per diameter ratio for electrical rotation mechanism working in a tube?

Use case: industrial stop valve placed in an another pipe welded perpendicularly making a T-shape. To make the question more specific let's consider 50mm inner diameter pipe for the linear actuator ...
30 views

### gear design.improving gear strength

For improving the gear strength, which one is better based on manufacture and economy? Increasing module or increasing N? With the same surface strength.
205 views

### How don't dog clutches collide?

I'm learning about how dog clutches work particularly in sequential transmissions. I'm having a hard time understanding the principle which ensures dogs will always mesh correctly. I can easily ...
46 views

### Did Charles Babbage's Difference Engine use the sautoir carry mechanism from Pascal's calculator?

We know that Blaise Pascal built a mechanical calculator which had a carry mechanism called a sautoir. You can see a video of it working here, and here. We know that Charles Babbage wrote a book ...
24 views

### Gear train with fixed average speed but irregular instantaneous speed

Is it possible to create a gear train whose average speed is fixed, but whose speed constantly fluctuates? I'm imagining something that would ideally always complete a single revolution in fixed time, ...
269 views

### How to calculate the moment of inertia of a worm gear?

Should I consider them as a cylinder to find their inertia? Any tips will be helpful.
64 views

### Electric engine and transmission

What kind of automatic transmission would be the best to connect an electric engine with the rear axle of a RWD car? Specifications: 200HP, 3000rpm electric motor top speed 220km/h The automatic ...
59 views

### A few questions about cars

When I start the car, why do I hear the engine working when I'm not pressing the gas pedal? How exactly does the torque and power of the gears work? Torque = Radius * Force Power = Torque * Speed ...
237 views

### Calculating needed motor to spin a disk at low RPM

I'm designing a machine that I need to spin a horizontal disk at low RPM using a motor and gearbox. I'm not good at physics so I need help to find a motor/gearbox to fulfill my needs. It's a ...
86 views

### Create Bezel-like ring mechanism

I'm designing a 3d print model of a ring that you can wear, but the outer surface of the ring can be dialed like a watch bezel. Check this video to see how the bezel moves in grades so it stops on ...
41 views

### Gear switching for simple differential steering

I'm rather new to the field of gear systems, and to the field of RC models to which this case applies. I'm trying to design a system where a single variable speed engine would drive two different ...
107 views

### How to accumulate torque of multiple independent gears?

I did not find any answers to this simple problem across the web, maybe seeking help in this forum helps: As an example, let's assume we have multiple windmills, each of them producing torque, but ...
24 views

### How To Obtain The Correct Differential Gears With Motor Shaft Adapters

My knowledge in gears in limited to their types (bevel, spur, etc). I am trying to combine the power/torque of two DC motors using a differential gear. I have a good handle on the idea and design ...
111 views

### Friction factor for wormgear design materials

I'm working on a database which involves geometric design parameters, forces analysis and efficiency and losses for wormgear reduction design systems. To determine the tangential and axial forces ...
164 views

### Reduction System for Gate-opener motor

I've been studying this topic for a couple of days now. I started by asking some questions regarding output Torque and gear ratios relations. Now I came with the whole picture and some calculations ...
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 ...
323 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: ...
130 views

### Wind turbines with down tower power units. Why aren't they more common?

Concerning the big megawatt wind turbines, if there is such a big trouble with gearbox bearings failing much earlier than expected and costly maintanence or replacement of huge gearboxes, what is ...
59 views

### Designing a 1-button system allowing for a differentiated control of 2 different valves?

I'm in the processes of building something which requires I'll be able to control the independent opening/closure of two (small, ~10mm in diameter) different adjacent holes using one finger, and I'm ...
258 views

### How do Salad Spinners work?

I am curious as to how pump salad spinners work: not in terms of how they spin and use centripetal forces to get rid of water. I mean in terms of how the pump itself works. How does the 2D motion of ...
131 views

### Master/Slave Gear Mechanism for Navball

I am designing a functional replica of the Apollo FDAI (aka 8 ball). See pics Real FDAI Another view From the Apollo 8 Flight Journal: The FD/AI (Flight Director/Attitude Indicator) or "8-ball" ...
962 views

### what is the degree of freedom of a pair of gear wheels?

Two gear wheels A and B are touching each other and they can rotate about fixed points P and Q respectively. how to calculate the degree of freedom of the system by using gubbler's equation?
43 views

### Efficiency of a planetary gearbox as a function of the lubricants viscosity

So I have a client that is asking about if they should switch from one lubricant to another in a planetary gearbox they have. The main advantage that this new lubricant has is that it has a much ...
123 views

### Bevel gear design & usage

The problem : I need to create a mechanism with 2 parallel shafts, at some distance apart, rotating in the same direction, either clock- or anticlock-wise. The distance (> 1m) makes it impractical to ...
58 views

### Need bevel gear for SG90 servo motor

I am looking for a away I can convert the horizontal rotation into vertical, typically we use bevel gear for such thing. But I am using a SG90 servo motor for which I am struggling to get the correct ...
129 views

### Internal Geneva drive calulations/design

So there is a lot of information out there about designing an external Geneva drive, but I can't seem to find anything about designing an internal one. I'm trying to design something similar to this (...
27 views

### Steel Worm/Steel Wheel vs Steel Worm/Bronze Wheel

I have a question regarding worm drives, specifically double-enveloping types: Do steel worm/steel wheel combinations last longer than steel worm/bronze wheel or steel worm/brass wheel combinations? ...
17 views

### Source for plastic rack gear strips

I'm trying to find a source for this type of plastic rack gear: This image came from this youtube video. I can find short pieces of straight rack gear on ebay, but nothing like this. It appears ...
196 views

### How to design a coaxial 1:2 gear without reversing direction?

I am trying to design a gear that has a 1:2 speed ratio (input:output). This design is very limited in space and for simplicity and space savings requires the input and output shafts to be coaxial. ...
48 views

### Finding the right worm gear for a wormscrew that didn't come with technical specs

I bought a CNC linear rail guide slide from ebay(seen here). I'm trying to find a proper worm gear to mate with the wormscrew. There is no technical specification that came with the kit however on the ...
114 views

### Is there a cheap way to get gears

Is there generally any cheaper way to get a bunch of gear wheels. I've been to some local companies who specialize in gear production and the price is always somewhere in the range 100-150 USD for a ...
35 views

### Gearhead & 'teeth-track' to drive rotation of ringed encasement?

I am not an engineer, so apologies if this one is a bit of an ill-thought out... Can anyone show me an example of something like the following scenario: A small stepping motor driving rotation of a ...
222 views

### The torque I need to lift the device and correct gear ratio for the device to be as fast as possible

The device have to climb a pipe vertically. I have a DC motor with power rating 21.2 w, output speed 13360 rpm and maximum output torque 154.4 gcm. My device is 1 kg and I have wheel with 0.012 m ...
74 views

### How can you calculate the torque and speed of a single output gear being driven by two different input gears?

I am building a gearbox that needs to lift around 50lbs very rapidly. I already have a single planetary gearbox that does the job in around 7-10 seconds, but I would like to cut this time down ...
50 views

### What is the tolerance on gear pitch?

I'm trying to make a gear to mesh with a motor shaft that I bought online, but it doesn't give any information about the pitch or diameter. When I measured the diameter and pitch of the motor shaft, ...
42 views

### How to get precision with a small gear?

I want to be able to precisely rotate a item. For this I have positioned the item on top of a very large gear. It is driven by a smaller gear. When the item is in the correct position, I will lock the ...
274 views

### Calculating Minimum Gear Ratio To Lift Weight

I have a 337 watt motor, and want to lift ten pounds. What kind of gear ratio will I need for a gearbox I attach to this in order to lift the ten pounds at a constant speed?
282 views

### How to increase maximum rotational speed limit of a reduction gearbox?

Reduction gearboxes made of machine steel gear have a maximum limit to prevent changing their physical properties (softening). They change their properties as a result of the temperature increase ...
73 views

### Understanding the torque of a motor/gearbox combo

Imagine a typical DC motor / planetary gear combos. Is my thinking correct: Say you have a 100 kg mass on a frictionless surface. The gearbox output shaft has a 0.10m arm with which you push the ...
29 views

### What are the some of the best (dis)engagement mechanism for small gears?

I’m planing to build a robot out of gears. I was wondering what kind of (dis) engagement mechanism would be suitable for gears that are about 2.5cm (1 inch) in diameter. PS: preferably, (dis)...
89 views

### How to fix this gear

This is a gear that transfers force from a motorcycle kickstarter to the transmission. What method should I use to repair the missing teeth.
114 views

### Reacting Propeller Torque?

A motor is used to drive a shaft that is geared through 1:1 bevel gears to a propeller. The shafts are mounted on bearings in a hard casing that is attached to a 2nd ground. I want to know if the 2nd ...
62 views

### Performance of RC car under different gear ratio, measured data vs hypothesis

Assuming the driveshaft of the rear wheeled drive RC car follows the linear DC motor theory for stall torque and no-load RPM, also voltage supplied is constant and no inductance as well. Note: the ...
62 views

### Intuitive understanding of the common normal at the point of contact of 2 gear teeth

Consider 2 oddly shaped surfaces and pick a point on each of the surfaces. At the point considered we can always draw a normal to the surface. Now if the two surfaces are in contact at this same point ...
1k views

### Functionally Matching Gears (teeth count) in Planetary Gearbox

I wonder, whether an equation $$R = 2P + S$$ should give a geometrically sound design, where $R$ is the tooth count for the ring; $P$, for the planets; and $S$, for the sun. I have tried to model a ...
124 views

### Mini freewheel / overrunning clutch for stepper motor

I am looking for a mini freewheel, one that I could mount on a standard NEMA 17 stepper motor (or similar stepper). I want to use it with a pulley, such that it starts the motion of a wheel, which can ...
404 views

### Gear pump has backflow and does not stop forced flow

I have a "Micropump GB-P25.JVS.A" gear pump. I pump in the range between 100 and 500 ml/min up to a column about 10 cm above the pump level. The column is filled from the top and has a bottom outlet. ...