Questions tagged [gears]

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Designing pinions for an angled differential

I'm designing a set of beveled gears where the input and output are oblique. It's simple to design a single pinion connecting them, two isn't hard, and I can model three as pitch cones, but getting a ...
3 votes
0 answers
40 views

How can a planetary gearset "work" with gears whose pitch diameters are not tangent?

Somewhat new to the gear-world here, so I am trying to understand something. Most of the literature an examples of planetary gearsets that I've seen so far have described a relationship where the ...
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0 answers
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How to limit rpm to 100 on bi-directional input shaft no matter the torque up to 10hp. Right angel gear box. 1:6 increaser rpm output 600rpm

How to limit rpm to 100rpm on bi-directional input shaft no matter the torque, up to 10hp. Right angel gear box. 1:6 increaser rpm output 600rpm
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1 vote
2 answers
51 views

Suggestions for mechanisms for slowly releasing gravitational energy

I'm searching for a mechanism to slowly release gravitational energy. I've attached an image of an example scenario where a 10kg weight slowly raises the 1kg weight over a set period of time, for ...
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1 answer
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Pulleys vs gears for a gravity battery

I would like to build a simple homemade gravity battery (a weight is pulled to a high height and is then dropped to turn a motor and generate electricity.) My plan is to have a 5kg weight pulled to 2 ...
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1 vote
1 answer
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Finding a gear supplier for a contra rotating boat propellor [closed]

I’m the new propulsion engineer in a solar boat team (something like this https://energyboatchallenge.com/en/home-english/, solar class). This year I have to design and build a contra rotating ...
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0 answers
10 views

Involute Gear Tooth Width on base circle

I want to calculate the tooth thickness of a spur gear on the base circle. There is a ready formula for pitch circle but I could not find that for the base circle. I guess we need to consider the ...
0 votes
0 answers
17 views

Planetary Gear that can be locked to 1:1 or geared 1:8

Im Building a DIY Fabricator. The build is going to be ball screw driven. I'm using Closed Loop NEMA 23's the RPM on these motors is 1000 RPM = 16.6RPS The ball screws have a Pitch of 5mm (16.6 x 5) ...
0 votes
2 answers
35 views

Trying to find the name of a gear system

I am trying to figure out the name of a gear type, I think it is a scissor gear, however when looking it up I dont find anything by that name. The gear is simple with a center screw and two nuts. The ...
0 votes
1 answer
49 views

Could a downwind cart, or “push-me, pull-me” boat of a substantially heavier size be propelled with the use of a CVT, or continuous gear?

As broadly proven now before the academia, a vehicle including a boat or cart (probably a glider too) can move faster than the speed of wind up to about 2.5-2.8 times with a propeller generating lift ...
-1 votes
1 answer
42 views

Can somebody please help me identify this gearbox?

I want to identify whether this is a bevel gearbox/worm gearbox or a standard gearbox from an automobile. This is a tractor PTO driven winch.
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2 answers
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How to prevent rod/shaft from sliding

I'm new to mechanical engineering and have a question regarding something that I design using fusion 360. Here I have 2 wooden rollers that are mounted on 2 side plates thru holes. I'm planning to use ...
-4 votes
1 answer
47 views

why does the Bugatti Chiron watch w16 animation only last 20 seconds? [closed]

why does the Bugatti Chiron watch w16 animation only last 20 seconds and not more? why doesnot it last more is because lack of energy from the mainspring ?
0 votes
0 answers
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Cam for linear actuator from a DC motor

I have a DC motor with known characteristics like torque, speed, etc... The actuator (in green) is like a piston and I know it must be operated as follow: with a force > 60 N the full stroke is 5 ...
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-1 votes
1 answer
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how to let a needle move in positv roation and then a negativ rotaiton then it should loops [duplicate]

i am trying to make a watch that looks like the speedometer from merceds benz AMG my problem is i canot figure out how to let the needle or the minute hand (call it what ever you want) rotate from 0 ...
-1 votes
1 answer
123 views

How can I make a needle to turn slowly CW to the final position, then return quickly CCW back to the initial position and to start again turning CW?

What I want is after the needle reaches 60 it should go back to 0 in the way showed in the image The mechanism should preferably be based on gears which convert a steady continuous rotation to the ...
2 votes
0 answers
20 views

What is the relationship for the curve of the non-involute portion of a gear (below the base circle)?

I'm in the works of writing my own gear program, but I've stumbled on something that textbooks and the internet don't seem to answer. A lot of the time, the dedendum of a gear cuts into the base ...
1 vote
1 answer
57 views

How to calculate torque on gearbox?

I've been trying to figure this out for days and can't seem to get it. I'm trying to create a DIY winch. The motor can pull up to 5500W. It'll be moving things between 45-90 kg (100-200lb) at a steady ...
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0 votes
0 answers
29 views

Calculation on gearbox design

I want to design a gearbox of 70hp input motor and speed of 1400rpm. The gearbox ratio is 1:10 of 2 stage parallel arrangements. How do I calculate for the teeth, modules and other requirements ...
0 votes
2 answers
60 views

Wheel's torque and differential gearbox

I know that the differential gearbox is providing a torque to the wheels; as the relation in the figure indicates : Tw (wheel torque) = Td (differential torque) × (ηd×nd). Where nd:is the differential ...
0 votes
1 answer
51 views

How to slow down an electric motor for pull cart?

I'm trying to retrofit an electric motor (such as this) to a pull cart as depicted below. I got most things figured out except for how to slow down the motor to a pedestrian speed. Could I slow it ...
0 votes
1 answer
75 views

Will a (stainless steel) underwater gear, formed by a 1500 RPM pinion and a ring cogged wheel 20 time its diameter, work?

Fig. 1 shows a submerged experimental electric generator of high power (above 500 kW) having an exterior rotor and an internal stator. For testing purposes this generator has to be rotated a long ...
0 votes
1 answer
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To reduce friction losses, is it better to have one single large ratio stage, or multiple smaller stages for worm gear?

If I wanted to have a 49:1 total reduction, would there be less friction losses with a single stage of a 49:1 or two stages of 7:1 and 7:1? Google has not been much help. My gut says that I should use ...
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0 votes
0 answers
38 views

Working of planetary gear set in electric bicycle

For mid-drive electric bicycles where the motor is attached to the pedals, it provides helping torque which reduces the force that needs to be provided on the pedal. So, how does a planetary gear set ...
-1 votes
4 answers
45 views

Shifting Between Gears To Achieve Higher Acceleration

If the car's acceleration is higher when the wheel's angular acceleration is higher(tangential acceleration=alpha x radius). Why are higher gears not used to accomplish the acceleration of the car ...
1 vote
1 answer
210 views

Calculating torque in planetary gearbox

It's my understanding that in a planetary gearbox, force moves through the system via four mechanisms: the ring gear, the planet gears, the planetary carrier, and the sun gear. I'm trying to ...
0 votes
2 answers
28 views

Are EC gears possible to machine in metal with conventional methods?

See https://www.ec-gearing.com/. I'm wondering if it's possible to CNC machine / mill this at all with very high accuracy.
0 votes
1 answer
35 views

Does protuberance affects basic gear dimensions like tooth tip height, tooth root height etc.?

Does protuberance affects dimensions like tooth tip/root height, pitch diameter etc? In my books there is a short sub-chapter about the protuberance but nowhere is said if it affects these basic ...
0 votes
1 answer
40 views

Conical pulley system and transmission ratio (closed)

I tried asking this on other SE forum but i think this is the correct one: Basically our teacher has sent us quite a lot of exercises but I can't get past this one which says: a pulley cone consists ...
0 votes
2 answers
70 views

Cogs ratio for 1:20 speed increase

Question may be a bit stupid and funny, but any kind of help would be appreciated. I need some kind of a transmission system. I have little to no experience in mechanics or similar, that's why I'm ...
0 votes
0 answers
86 views

One way locking mechanism linear movement

Sorry for the English in advance, it is not my native language :) I am working on a design which involves moving two steel plates in a horizontal linear motion together to clamp around a box. After ...
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3 answers
78 views

Question about torque in car engines

Sometimes people say "The engine of Car A has a higher torque than Car B with both having the same horsepower" My question is : if both cars are equal in horsepower can't we just avail this ...
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1 answer
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Is it essential for two meshing gears to have even number of teeth?

Should the teeth of meshing gears be even rather than odd numbers? If not, which is better?
0 votes
1 answer
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Could I have help on understanding stepper motor speed?

I'm confused about stepper motor speed. On their data sheet it doesn't really specify a maximum speed. I want to use a stepper motor with a 3:1 gear ratio. This is the motor that I am looking at: ...
0 votes
2 answers
44 views

Modulating Output of a Pulley with Variable Inputs

I am working on a recreational project to take variable inputs and convert them to a constant output without substantially altering the force required to achieve such a task. The best way to visualize ...
1 vote
1 answer
40 views

Altering an inexpensive clock mechanism for something other than 12 or 24 hours

How can one alter a common analog quartz clock mechanism to do 13 hours or decimal time? One can create a mechanism from scratch with garage tools, but that's still not nearly as accessible as ...
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1 vote
1 answer
204 views

Rotational lock design for a landing gear of an aircraft

I want to design a rotational lock mechanism for the landing gear of an aircraft. It's function is to make sure the landing gear stays folded when the aircraft is on air and the landing gear's ...
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0 votes
1 answer
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How to make a circle spin from the edges

I have an issue where I need to make a large wire through a bearing spin in 3" diameter circles, and have a weight hanging from the bottom of the wire. Essentially, I need a hole that moves in a ...
0 votes
1 answer
36 views

Frictional wheels without slipping (gear system)

In the figure below it is stated that the friction force should always be greater than the tangential force in order to prevent slipping between two frictional wheels. My question is that if we apply ...
0 votes
3 answers
93 views

How to combine the power of two rods spinning at a different speed into one rod spinning at a combined speed? [duplicate]

I have two rods (that will be powered via something like two water wheels), and I need to combine their power so they both rotate the same rod. Sadly, they may spin at different speeds, and the ...
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0 votes
2 answers
138 views

What is the diametral pitch for a gear rack with 32 teeth per in?

I am trying to order a gear rack with 32 teeth per inch. I can't seem to get my math right to figure out the diametral pitch for a gear rack with 32 teeth per inch.
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1 answer
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I need a coaxial gearbox that translates reciprocating clockwise & counterclockwise rotation to unidirectional while increasing speed of rotation?

I am a noob engineering student. I want to design a coaxial gearbox that takes an input shaft that rotates reciprocally (clockwise then counterclockwise) and increases the speed of rotation ...
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0 votes
0 answers
28 views

Finding the actual tip radius of a spur gear with large pressure angle and low number of teeth

I'm writing software to design standard spur gears that can have large pressure angles and low numbers of teeth. I'm dealing with undercut issues fine but struggling with the teeth tips. As pressure ...
0 votes
3 answers
23 views

Is it possible to construct geared speed and torque dials?

Say you have a very complex completely mechanical machine, and you want to put a dial indicating rotation speed of the central drive shaft and its torque. But the machine is completely mechanical, and ...
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6 answers
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Why are hydraulic systems widely used to multiply force ? won't a couple of gears do the job?

Hydraulic systems seem to have become ubiquitous. From huge cranes and excavators to disk brakes to door hinges. Basic requirement everywhere is the need to multiply force; trading greater force for ...
1 vote
2 answers
238 views

What is this type of detent mechanism called?

I'm trying to find out what this common rotary detent mechanism is actually called. I see them in all sorts of cheap plastic toys, and I'd like to see if I can find them for sale, but I don't know ...
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1 vote
1 answer
391 views

How to determine optimal distance of rack and pinion?

What is the optimum distance between a rack and centerline of a pinion? In the image below I have two racks opposite each other and the teeth surfaces are tangent to the faces. The center pinion is a ...
2 votes
2 answers
50 views

Looking for data or nomenclature that partains to "Smoothness/accuracy" of servo grade gearboxs for roll to roll application

I am designing a roll to roll web drive system where having smooth consistent very slow speed is important to quality of the product. I will be using a clearpath servo motor with a gearbox of 20:1 ...
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0 votes
2 answers
269 views

How can I merge two input into one? (gear mechanism)

How can I merge two input into one? (gear mechanism) There are a tube, a shaft, and a gear. The shaft is in the tube and both of them rotates in same direction. And I have to deliver the power to the ...
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0 votes
1 answer
100 views

Rotate - Mechanism that changes direction

I have a square plate (8x8 cm) that I want to turn it 90 degrees clockwise and after 90 degrees counterclockwise as you can see in the picture. Each rotate will happened after a second delay and fast (...
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