Questions tagged [gears]

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11 views

Linear Motion Ratio on Eccentric Cam Pulley

If you have an eccentric pulley wheel and attach a rope to the top most vertical position and pull downward, the point at which the rope is fastened inscribes a circle with the radius of the distance ...
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18 views

I need a mechanism/method to control a shaft that can rotate at different speeds. (faster clockwise and slower anti-clockwise)

I need to develop a mechanism - Where in I have a shaft that needs to rotate at different speeds. Lets say at a higher RPM clockwise and a lower RPM anti-clockwise. This shaft is attached to my ...
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1answer
54 views

Is there a way to auto-reverse cassette tape with gears only?

From what I read, tape decks auto-reverse by having a sensor keep track of an encoder. When the take up pulley stops turning, the logic board reverses the direction of the motor (and does some other ...
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3answers
566 views

How Much Efficiency is Lost in a Gear Train

I want to get a rough estimate for the transmission efficiency of two different gear trains. One is a one-stage gear train with 11.67:1 ratio (140/12 teeth) and the other is a compound two-stage gear ...
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15 views

Good resources (textbooks) with steel S-N curves?

Looking for S-N curves for common gear materials (steel, cast iron). Are there any sources with multiple materials compiled together? Currently cobbling some charts but they're more inconsistent than ...
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3answers
42 views

Attaching Gear onto Motor

I want to attach a 12 toothed spur gear with a bore diameter of 6mm onto the shaft of this motor (6mm diameter). How would I go about doing this? From what I see, the shaft is smooth so is my only ...
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1answer
21 views

If a driver gear has larger radius than a driven gear, will a larger gear ratio result in more torque supplied to the driven gear?

Suppose a driver gear has larger radius than a driven gear. For example, we have a pinion with a main disk, where the main disk is larger than the pinion and the pinion is a follower. This is the case ...
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1answer
35 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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1answer
67 views

Driving Gearbox in Reverse

https://www.maxongroup.com/maxon/view/product/251601 https://www.maxongroup.com/maxon/view/product/gear/spur/gs45/301171 Consider that this motor-gearbox combination is backdriven so that the motor ...
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0answers
50 views

The optical encoder resolution

The optical encoder has a code wheel with a single track of slots and two photodetectors. The photodetectors are positioned so that they produce signals with a 90 degree phase difference. I want to ...
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1answer
26 views

small gearbox for experimental wind mill

The gear box will have little torque as I am only using a 12 by 18" wing which rotates. The two shafts I am using are 1/4 ", one form the wing and the other going the to pivot for the wing to circle, ...
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1answer
46 views

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 $\eta=0.7$ ...
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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 ...
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22 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.
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1answer
60 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 ...
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1answer
30 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 ...
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1answer
20 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, ...
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2answers
72 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.
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1answer
57 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 ...
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2answers
44 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 ...
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1answer
57 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 ...
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1answer
41 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 ...
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1answer
36 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 ...
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3answers
33 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 ...
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17 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 ...
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1answer
45 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 ...
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2answers
84 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 ...
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30 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 ...
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22 views

Gear ratio comparisson

I have been studying about Torque and gear ration in another discussion Torque and RPM calc, and I received good answers that make me go in-depth into this topic. To understand it better, I want to ...
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3answers
126 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: ...
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4answers
117 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 ...
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2answers
53 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 ...
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1answer
76 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 ...
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1answer
44 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" ...
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1answer
189 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?
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40 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 ...
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15 views

notch consideration

I'm designing a bevel gear. And I want to design the pinion and the shaft such as they are one piece all together. So I was wondering if I should consider a notch effect at the exact point where the ...
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1answer
68 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 ...
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0answers
31 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 ...
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1answer
50 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 (...
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0answers
22 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? ...
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16 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 ...
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0answers
40 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. ...
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0answers
46 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 ...
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3answers
60 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 ...
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0answers
27 views

Is it possible to mechanically switch between rotational directions of an output shaft?

I know that it would not be possible while the input is still rotating, but is it possible to create a gear box or chain assembly that can change the direction of rotation?
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29 views

Rack pinion possible?

I want to lift a weight of about 300 kg suspended to a rack of width 15 mm. This weight will be lifted using a spur gear pinion with OD not more than 8 mm. The material will be SS 304. Weight will ...
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0answers
33 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 ...
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1answer
92 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 ...
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45 views

Need help picking motor to wind a spool

The application is a motor attached to a spool to wind/unwind window blinds. I would like to operate the motor at $v=0.2\text{ m/s}$, with a max load of 1.5 kg. I need to know the ideal diameter ...