# Questions tagged [gears]

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### How can I produce two 180-degree intermittent rotations with a Geneva drive?

I would like to convert a continuous rotation into two 180° intermittent rotations. A standard Geneva drive layout can not do this, is there any variation of a Geneva drive that can do this? Above is ...
669 views

### Force limits for gear rack and pinion gear

I am accessing the feasibility of using a gear rack and pinion gear to move a moderately heavy object. I have never used gear track for a larger project so I don't have an intuitive basis for judging ...
168 views

### What's the difference of using different state-space forms for solving eigenvalue problem?

I have a set of equations of motion describing a planetary gear train of 18 DoF (sun, 3 planets, carrier and ring), they have the general form of: $$\mathbf{M{\ddot q}+{\Omega_c}G{\dot q}+{Kq}=F(t)}$$...
96 views

### Identifying a connected plate on a gear liquid-metering pump

This is part of an electric resin-extruding machine. What's the part, and if possible, who makes it? Any additional information regarding what the part is, or what the assembly is called, is greatly ...
140 views

### Dynamics of Mass in Epitrochoidal Motion via Ringless Planetary Gear System

I'm trying to model the planar dynamics of a mass travelling about an epitrochoidal path due to being rigidly attached to a planet gear that rotates about a sun gear. Assume the gears to be circles ...
337 views

### What is the difference between a strain wave gearing and a Harmonic drive?

I see there are two different Wikipedia pages for strain wave gearing and Harmonic drive. To my knowledge they are the same. Harmonic Drive is the trademarked name of strain wave gearing by United ...
59 views

### Measuring Helix Angle

What is the best way to measure the helix angle of a helical cut gear? I have a sun gear from a planetary set that I would like to have custom made but I'm not sure the best way to get the helix angle,...
99 views

### What is the deflection of planet-ring Gear Mesh along the pressure line and the position of the Plant gear?

For a Sun-Planet mesh in a planetary gear train, there will be a deflection $\delta_{sn}=\delta_{s}-\delta_{n}$ along the pressure line and the position of the planet will be determined by $\psi_{n}$, ...
8k views

### Calculating load on planetary gear from driving torque

I am very new to gears I am fairly confused about planetary gears. I want to know the load on the gears contact point between the sun and the planets and the planets and the ring, assuming the ring ...
51 views

### Why is the spin velocity of a gear irrelevant if perfectly balanced?

Going through some theory about epicyclic gears I came accross a comment that says that the spin velocity of the gear irrelevant if perfectly balanced, I don't understand why this might be true, is it ...
1k views

### Torque and Speed of a DC Motor with Pulleys and Wheels

I want to know how to calculate the speed of an electric skateboard If i have that situation(from the picture below) i will need an acceleration=0.16m/s^2? and a force F~=15N? So i will need a ...
183 views

### Worm Drive Calculation

I have this setup: -Pully with a mass attached. -Worm gear drive to lower the mass with a constant speed. (Section A-A) Now if we look at the cross-section A-A, we can see the worm gear drive: ...
341 views

### Considerations for planet carrier design

I need to design a planet carrier for a planetary gearbox to which I'm gonna be doing some simple vibration experiments. It basically consists of the ring, sun and 3 planets and the ring it's no more ...
41 views

### Would friction forces impact a torque measurement transmitted through a gear box

I want to be able to detect very small torques placed on the end of a cantilever beam. These torques are very small - 1mg by 10cm. I am trying to make this on the cheap and use a load cell. I plan ...
26 views

### Gear design for symmetrical opening of two parts

I'm trying to build a lamp which has about 20 identical layers stacked on top of each other. There is a central spine and, on each level, a pair of arcs attached to the spine that are hinged and which ...
989 views

### Tug of war robot w/ max torque [closed]

Hey I was wondering what kind of chassis, wheels, gears are for a robot with a lot of torque. Please help. I have decided on a trapezoidal chassis, and I know that the servo connects to the small gear ...
354 views

### How to model a planetary gear system with transformation matrices?

I need to model the planetary gear-train with transformation matrices of 1 sun and 2 planets system, with no ring and an "arm" or carrier holding the gears ,like in the second picture. I ...
1k views

### Does gear diametral pitch have to be an integer? (teeth/diameter)

I'm doing a gear design project, and I'm using a multivariate mixed integer non-linear optimization suite known as Couenne distributed by COIN-OR. Within Python, I ...
3k views

### Gear train with rack and pinion

I'd like to know if I can use a gear train to drive a pinion, and thereby increase the torque of the rack. If so, how does the gear ratio of the gear train affect the torque of the rack relative to ...
1k views

### What mechanism can make a shaft rotate in steps

I want to make a shaft rotate in 21 discrete steps, from a motor that is turning smoothly. I am thinking of some kind of simplified clock escapement type of mechanism. Or non circular gears. I ...
487 views

### Shaft to swap direction of rotation

What is the simplest way if you have a shaft rotating clockwise for it to have an extension that rotates anti clockwise. Least loss of energy is best so i think a mechanical mechanism would be best. ...
117 views

### What's the name for a kind of gear that slips tightly over the top of another gear and can drive the gear it's surrounding?

What's the name for a kind of gear that slips over the top of another gear and can drive/turn the gear it's surrounding? I'm making a handcranked flashlight with my 7 year old. We're thinking of using ...
63 views

### What does natural frequencies with multiplicities m=1,2 or n mean?

If I have a planetary gear set consisting of one sun and N planets, what does it mean if it says that typical vibration modes of 6 natural frequencies always have multiplicity m = 1 for different N, ...
205 views

### What is the Gear Transmission Error and How would a Signal Analysis look?

I understand the Transmission Error is the displacement error of the gear shafts, but if measured how would the signal over time show and why? if its a sinusoid would that mean that only a few times ...
12k views

### How to reverse the direction of rotational movement on the same axis?

I want to make a "gearbox" that will transform input rotational movement to an output rotational movement with the same speed but in the different direction (clockwise / counterclockwise) on the same ...
256 views

### What does multiplicity of a multiple natural frequency mean?

I'm doing some vibration tests on planetary gear sets and a lot of the information I´ve read mentions a lot about mode shapes and multiplicities of the natural frequencies. I understand how one can ...
169 views

### How to simulate the Natural Frequencies of a Planetary Gearbox?

I have a dynamical model of a planetary gearbox of the form: $\mathbf{M{\ddot q}+{\Omega_c}G{\dot q}+{[K_b+K_m-\Omega_c^2K_\Omega]q}=T(t)+F(t)}$ $K_b$: bearing stiffness symmetrical matrix $K_m$: ...
447 views

### How to design CAD bevel gears from known outside diameter?

I'm working on a problem where I need to design and 3D print bevel gears to fit in the inside of a box and transmit a gear train around the inside corner, as roughly illustrated by the cross section ...
1k views

### Why do tower cranes have gear shifts?

Internal Combustion Engine powered cars need multi-speed gear shifts since their power is highly dependent on speed and engines have narrow usable power/speed bands. Some electric vehicles are also ...
76 views

### How does the second Motor operate in this diagram?

The two motors are mounted in parallel as you can see in the picture and each one of them is connected to a gearbox through an elastic coupling. My question is : how do they operate together ? is one ...
7k 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 ...
548 views

### How do folding barriers work?

With folding barriers like the one below, how does the orange bar get turned by the green mechanism? What's inside the yellow triangular part? https://www.youtube.com/watch?v=LF8kSTCZIxw
315 views

### Composite vs metal gearing

I am planning on buying a kitchen stand mixer with planetary action. One important factor to consider is the type of gears the mixer uses, they can be plastic, composite or metal. As far as I know ...
6k views

### Internal teeth involute gear pitch circles

I'm having some trouble figuring out how to design the corresponding internal gear for any particular spur gear. With spur gears, meshing is accomplished by having two gears with the same modulus (MOD)...
993 views

### Can the speed of a falling object be regulated using gears?

I am not an engineering student, but can understand if explained, so excuse me if this is too basic. For a personal DIY project I envisioned, I need to make an object, attached to a set of gears, ...
259 views

### Epicyclic Gear Train [closed]

I'm working on a solution to this problem and I would like some advice and help. A fixed-ring epicyclic gear train is required to have an overall ratio of 5.5:1. If the sun gear is to have between ...
252 views

### Linear force multiplication (or division) without hydraulics

Gears are used to transfer power between two rotating shafts, either by increasing or decreasing the angular speed, with a corresponding inverse change in the torque. If I want to do the same for ...
48 views

### What actuators do the me-shifter gear shifting system uses?

I have a shifter kart (125ccm kz2) with 6 gears. What I want to do is to change gears from the steering wheel. Like in the system mentioned in the question. I have the electrical and electronic ...
221 views

### How split-flap display rotates by exact angle

In a split-flap display there is a barrel which rotates by a small angle N times to get to some next display element. However I fail to understand, how it is possible that the barrel rotates exactly ...
10k views

### How to I design a planetary gear with a gear ratio of 2:1 ( doubling the torque) [closed]

Trying to design a 2:1 gear ratio planetary gear, and I'm not sure how to begin. In the past I've had luck using this site to create an illustrator file that I can extrude in Rhino. This does not ...
2k views

### Why do single speed RC cars use a gearbox?

Being a mechanical engineering novice (I stick closer to solid state electronics), when I look inside of any toy-grade RC car, I see a series of different-sized gears between the motor shaft and the ...
985 views

### Is a gear usually held to a shaft by friction or an adhesive?

So, where I work, we have this arcade game, which is a classic claw machine. IN order to raise the claw up and down the machine makes use of a worm gear, like so: (although for the meticulously ...
1k views

### How to make wheel rotate slower in one direction than the other?

For one axle with one wheel, can the following rules be met and if so, what would be the most simplistic implementation? Rule #1. Axle rotates clockwise: Wheel rotates at a 1:1 ratio with the axle. ...
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 ...
112 views

### Lead calcuation for spiral bevel gear

I want to machine a spiral bevel gear on a manual universal milling machine using a involuter gear cutter. I also have a differential indexing setup for this job. But the difficulty I am facing is ...
14k views

### Is "pitch diameter" the same as the distance between the centers?

I am designing gears in FreeCad, and printing then on a FlashForge Finder. I want to know if the pitch diameter is the same as the distance between the centers of the two gears. Both gears are ...
77 views

### Larger gear for telescope focus rack?

I am not a mechanical engineer, so just trying to figure this out. I want to attach a servo to my telescope focus, but the servo only has about 180 degrees motion, whereas you need to turn the knob ...
4k 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 ...