Questions tagged [gears]

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votes
2answers
267 views

Why do we use bevel gears?

I understand bevel gears are used in situations were a 90 degree change is required, but I can't visually understand why. Why can't we just use standard spur gears at 90 degrees, what do we actually ...
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1answer
513 views

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 ...
3
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2answers
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 ...
3
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1answer
171 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 $K_m$: ...
3
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3answers
566 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
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3answers
1k 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, ...
3
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1answer
5k 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 ...
3
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2answers
184 views

3d model gear to fit another gear

I have been trying to model a custom gear to fit on to another physical gear. I having been using this 3d model gear generator. What I know about my physical gear is that it has: (what I believe to ...
3
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3answers
338 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
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3answers
199 views

~121:1 speed reduction; are more gears better?

Taking a 1750RPM 110VAC appliance motor down to about 60RPM, maybe a little less. It's a home project on the cheap, so dropping a few hundred dollars on a ready-made gear box is to be avoided, and I'm ...
3
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1answer
60 views

Contact stress of bearing surfaces

I am searching for information on how finite element code (abaqus /ansys) could be used to model the contact stress behaviour between 2 bearing surfaces? The key point is that there is an additional ...
3
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3answers
230 views

reducing rotational speed from gearmotor to below 1rpm

I need to produce a very slow rotational speed for a disk -- 0.25rpm, or 1 rotation in every 4 minutes. The disk is nominally 12" in diameter. It will be driven by a DC gearmotor, through a worm and ...
3
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1answer
263 views

Center line to centerline of pivots for two 16 diametrical pitch gears. One gear 72 tooth other 36 tooth

I have two spur gears, each of a diametrical pitch of 16. One gear has 36 teeth and the other 72. I need to know what the distance should be center line to center line of the gear set. This would be ...
3
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1answer
217 views

drive/driven gears

Is it possible to have a drive and driven gear on the same shaft? Rookie question, I know. I've been doing a lot of googling and sometimes I think I understand that they can, but reading the ...
3
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1answer
284 views

Nylon gears for 0.4Nm torque

I see that POM gears are often not preferred in high torque settings - but how about 0.4Nm? Is that amount of torque too much for module 1 POM bevel gears? Say they are 16-tooth. Is 0.4Nm considered ...
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3answers
3k views

How can I apply a load to an electric motor to simulate realistic conditions for an experiment?

I am trying to perform some experiments with a motor and I want to run it under realistic conditions (or at least not unloaded). Is there an easy way to load a motor? A couple ideas I had include: ...
3
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2answers
73 views

Rotating Multiple Solar Panels with One Motor

I am designing a system to have solar panels track the sun, but only with one axis of rotation that will tilt the panels from east to west. I want to connect the panels together so that one motor ...
3
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3answers
1k views

Is a 1:1 Worm Drive possible?

I am working on a project that requires a wing to be rotated and I need the rotation mechanism to be fail-safe -- if power fails, the wing will stay in place and not move around. My thought was to ...
3
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3answers
1k 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 ...
3
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1answer
220 views

How do I mechanically convert 200 steps into 360 discreet degrees?

I have a Nema 17 stepper motor that does 200 steps per revolution, or 400 800 and 1600 micro-steps if in micro-stepping mode for convenience sake I would like to somehow translate the 200 steps into ...
3
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1answer
62 views

Canonical approach to experimenting with a gearbox design

I'm hoping to design a simple gearbox for a 1-seater car for kids. So far I'm only using discs of paper I cut out and rotating them by hand. I wonder what the canonical approach is to prototyping/...
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2answers
8k views

Worm gear & motor selection calculation

I am trying to build a worm gear based on a single axis solar tracker for a worm gear box. I need some guidance choosing a worm gear & drive motor for the application. These are the steps I have ...
3
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1answer
105 views

Gear Ratio of a Stepped Planetary Gearset

I was looking into planetary gearsets, and came upon the concept of a stepped planetary gearset. In the image shown above, if my input was the blue sun gear, the output was the planet gear, and the ...
3
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1answer
180 views

Resist rotation with friction or teeth?

I prototyped this attractive wooden sit/stand laptop stand but ran into a problem keeping the legs tight enough to hold their position. There are 1/16" thick EPDM washers between the oak legs - the ...
3
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1answer
995 views

How can I separate gear oil from metal shavings to weigh worn metal?

I have tested a gear box for many hours. Where the gears are made of a hardened steel alloy and the housing is 7000 series aluminum. Now I drained the gear box of its gear oil and I need to weight the ...
3
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2answers
282 views

What is technology used to seal a gear shaft to metal frame?

I'm working on paper cut mechanism, I use gears to move blade to cut paper. I would like to get knowledge about the technique of seling gear shafts to a metal frame. It would help me in designing ...
3
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1answer
984 views

How to limit axial movement for a key joint?

I need to design a simple gearbox for homework. I figured out to locate 2 sliding spur gears on the input shaft and 2 fixed spur gears on the output shaft. I prefer to use key joints, as they are the ...
3
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1answer
728 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 ...
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0answers
37 views

Volumetric oil pump efficiency goes up when viscosity goes down?? Strange behaviour

Riddle me this : we are driving an external gear pump (this kind) at a fixed RPM. At start, when the oil temperature is low (and viscosity high), the volumetric flow is much less than when the oil ...
3
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1answer
62 views

Gear profiles (involute and root) generated by power skiving

@Involutius contributed an article on the equations that describe the root profile of gears which are cut by a trapezoidal-profiled hobbing tool. From that article, I was able to do a slightly ...
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0answers
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 $\psi_{n}$, ...
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0answers
142 views

A round, plastic pinion in a lock?

I'm looking at a teardown of a Masterlock. The guts look like this What's strange to me is the black, plastic pinion that appears to be smooth and a strangely shaped cam: Here's the cam magnified: ...
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3answers
107 views

Feasability of glass gears?

I recently saw a video where a glassblower was making something, and one of the first steps was to push the wad of molten glass down into a shaper with a number of vertical spikes, such that the ...
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4answers
204 views

How can a clutch engage gradually without wearing away very quickly?

Here's an animation of a gearbox and clutch from Wikipedia. I learned to drive recently, and was surprised at how the clutch worked, engaging gradually as I moved the pedal by fractions of a ...
2
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2answers
1k views

Working out functional gear in AutoCad

The title pretty much sums up the question, but basically I need to create 3 sizes of gears. I have tried 2 shapes, the first being basic rectangles. However, according to my Engineering teacher, ...
2
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2answers
434 views

Right angle gearbox, proper name or design

I'm looking for right angle gearbox, but everything is horrible expensive or in parts like two bevel gears from aliexpress. Where I can find or how to name transmission like this in the picture but in ...
2
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3answers
161 views

Bi-directional gearbox

I want to design and create a gearbox that allows an input shaft to be continuously rotating in one direction, while the output shaft rotates one full turn in the same direction but then half a turn ...
2
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3answers
132 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 ...
2
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3answers
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 ...
2
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3answers
532 views

Use two gear racks to multiply linear motion

I have an object (shown in green) that I want to pull out distance X and then I want another object (shown in red) to move 2X. What would be the best way to achieve this? I thought that gear racks ...
2
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2answers
597 views

Gear Design - Teeth Fit [closed]

I am working on designing a set of gears for 3D printing. I have not done any gear design before - how should I improve the design to prevent gear slipping?
2
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3answers
2k views

Design a worm gear that works with a straight wheel

Usually, worm gears drive helical wheels. For my application (hand-driven orrery), I am studying a more cost effective approach: using a straight wheel. It is technically possible as you can see with ...
2
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2answers
7k views

Why do small gears used to turn big gears allow more force with less effort?

If I have a small gear that I am turning a large gear with, from what I know that gives me the ability to move heavier things. Like a winch of sorts. Why does turning that little gear allow that ...
2
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1answer
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. ...
2
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1answer
247 views

Spur gears design

I have a problem in understanding of gears (spur gears). I designed some spur gears but I don't understand how the modulus works. I saw that this modulus is some standard thing and it's calculated by ...
2
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1answer
98 views

Torque between concentric gears

First time asking question here. I'm not a mechanical engineer! I have a simple question that I can't explain the answer to it. I have a double gear (2 concentric gears with different radius) and I ...
2
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1answer
121 views

solidworks mating gear with shaft problem

I am trying to mate a gear with a shaft via a key.key coincident with gear and cocentericity of gear with shaft cannot both be made.
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2answers
165 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 ...
2
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2answers
97 views

Keeping rpm stable with input of floating rpm

How can I create a gear system which keeps, say, 60 rpm stable on output wheel, when I don't care about force? I am using a hand-turned crank as an input wheel. I know a flywheel could be used, but ...
2
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1answer
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 ...

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