Questions tagged [gears]

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2
votes
1answer
350 views

Trouble with Base circle and meshing with spur gears

I am a novice who is trying to make some gears. I have followed the formula's but sadly something seems to go wrong and the gear's don't come out right. Below is some dimensions and pictures. Gear 1 ...
0
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1answer
127 views

Calculating the output torque of a two-input epicyclic gear system

For a simple planetary gear system with a single input shaft of a known torque, the output torques of the other two shaft can be calculated using the equations below (for a steady state system). If I ...
2
votes
1answer
70 views

Automatic compression of springs

I am trying to design something for a friend, but am struggling to come up with the mechanics. Can you help? So imagine a long extendable pole, like a bow staff. Imagine after pulling out a "peg&...
5
votes
6answers
967 views

Mechanical mechanism that regulates gear's rotational velocity

Please do note that I am a civil engineer not a mechanical engineer. I have a gear that rotates at a speed that varies with time. Usually, it rotates at speeds higher than the desired speed. Is there ...
0
votes
1answer
195 views

Crafting a mirrored shifting drum for motorcycle gearbox

I would like to reverse the gearing of my Husaberg FS 650e motorcycle so that by pressing the shifting pedal the gearbox changes up instead of down to the first gear. There are many solutions on the ...
3
votes
1answer
70 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 ...
2
votes
1answer
94 views

Gears with tilting shafts

I am looking for the following mechanism: A pair of gears initially in side-by-side arrangement. The shaft of the first gear is fixed to a first plate. The shaft of the second gear is fixed to a ...
1
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1answer
40 views

Implementing a locking mechanism for a rotating platform [closed]

I have a square platform 2' X 2' X 1". It has clamps on two of its sides that clamp down on the small faces. These clamps are on opposite sides of each other, and they also have shafts sticking ...
0
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2answers
37 views

planetary gear - number of teeth

I created the following planetary gear in FreeCAD. I calculated number of teeth using formula R = 2*P+S. In my case R = 75 P = 5 (there are 3 of them) S = 45. Also all gear have the same pitch of 2.5 ...
0
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1answer
14 views

Reduction Ratio Problem

I am trying to work out the relation between a $\mu$step and the distance moved by the moveable mirror in the Michaelson Interferometer: The mirror on the stage is moved by a stepper motor. Inside ...
-1
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4answers
35 views

How does gearing affect top speed and acceleration exactly [duplicate]

I was just reading an article about "What affects a car's overall top speed" and it left me wondering how gearing affects top speed and acceleration. While I did manage to learn how ...
2
votes
4answers
2k 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
votes
1answer
73 views

Determining the torque needed for a servo motor

I'm looking for a bit of clarity on a design I have in mind. Please bear with me as I have no background in physics, engineering and this is part of my first real DIY project, so the knowledge base ...
16
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4answers
7k views

How do bike wheels keep turning when the rider stops pedalling?

I am very confused with something regarding bikes... How is it that a bike wheel continues to spin (either from momentum or from going downhill) when the rider is not pedalling, without also spinning ...
1
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3answers
85 views

Do gears affect top speed?

Do more gears affect the top speed/acceleration of the car in any way? I know the gears won't increase hp since more gears would increase RPM but would decrease torque.
0
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2answers
34 views

Joining bronze gear to bronze shaft

I'd like to build a scale model catapult, and I'm building a tensioning/ratchet system similar to what is shown in this video: https://www.youtube.com/watch?v=yi4p8ZR4n28 The ratchet gear in the video ...
2
votes
1answer
99 views

Geared stepper motor engage/disengage mechanism

I'm trying to come up with an engage/disengage mechanism for my stepper motor. It will be connected to something that I'd like to be able to move manually as well, and since it's a geared stepper ...
0
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3answers
53 views

How to calculate perimeter of spur gear?

I'm in need of some gears, but having them made by a machinist is very expensive so I'm planning to have them laser cut. Loads are reasonably low for any grade of steel, so I'm hoping it should be ...
0
votes
1answer
262 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 ...
1
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5answers
78 views

How can I add the torque of multiple gears?

If I have 3 gears meshed with a gear in the center of the 3 gears as shown in the picture. all of those 3 gears are connected to different power sources. They are free to rotate in the same direction ...
0
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3answers
43 views

Does the amount of torque that can be transferred from wheel to rod change based on the distance of the connection to the rim of the wheel

Let's say I have a rod that I need rotating, like in a regular crank mechanism: Now, the motor I use is too weak to generate the required amount of torque to move the mechanism. So I put a gear with ...
1
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0answers
19 views

Sign convention for angular velocities in 3D gear train

Consider a Humpage gear train shown above. We are viewing the gear train from right and gear B is rotating in clockwise direction. If we consider clockwise direction as positive what will be the sign ...
1
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2answers
96 views

Velocity or Speed Ratios in Gears and Gear Trains

I have seen the different definitions of the velocity ratio for Gears and Gear trains. I have referred a book called Theory of machines by S. S. Ratan. In that book the definitions are as following: ...
1
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1answer
47 views

How to I determine the dimentions for a worm gear?

I have a worm gear set with no drawings. I need to model them. The only things I know are 1) The Gear ratio is 30, and the worm gear only has one thread. It is a single start as opposed to a multi ...
0
votes
1answer
65 views

How to evaluate motor rating?

I am trying to determine what type of motor to buy that can spin my load at high speeds without overloading it, but really, evaluating this is not my forte. I know this is not sufficient information ...
0
votes
1answer
34 views

XL timing belt missing Dimension!

I'm trying to design and 3d print a XL pulley. I think there is a missing dimension that I can't find in the spec tables. we've got pitch circle, teeth height, belt thickness... but I can't find ...
2
votes
2answers
2k views

How do you calculate the best gear reduction for max speed?

I know that a gear reduction would decrease the RPM if the motor ran at constant speed, but in reality its speed is a function of the load. I first tried turning a wheel with a direct drive system, ...
1
vote
2answers
116 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 ...
0
votes
2answers
93 views

Will this work for single output twin engine

I’m wondering if anybody can help me by critiquing my project idea of having a failsafe power train 4x4 for remote touring🙂. Instead of having one big engine, I’m toying with the idea of running two ...
0
votes
1answer
53 views

How to calculate this gear ratio?

I have built a little gearbox to reduce the RPM and increase the torque, that is composed of 8 gears that are all equal: they have 12 teeth "in the small side" that transfers the motion to ...
1
vote
1answer
62 views

Best DIY material for a high-torque cog or gear?

I am making a gear/cog to attach to a high torque stepper motor. I can realistically make it out of the following variety of materials: 3D printer PLA/PLA+ etc. layered PLA/PLA+ and fiberglass made ...
1
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0answers
25 views

Gear Oil HP 85w-140 vs HP-140

I have a 4 Stroke scooter 150cc (SYM JET-14). Manufacturer recommends 85w-140 gear oil. The price difference between 85w-140 and single grade 140 is tremendous. Given that in my country and during ...
0
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2answers
672 views

How do I calculate the ideal travel distance of the ball screw per revolution of the stepper or per step for the following hardware?

Question How do I calculate the ideal travel distance of the ball screw per revolution of the stepper / per step for the following hardware (I believe this is called the lead)? Background I have a pre-...
1
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0answers
50 views

What is a good approach on creating a custom robotics gearbox

I would like to put together a custom gearbox of the scale of around 50mmx30mmx30mm to fix a gadget that I am designing. My question is how should I approach producing this? Should I design components ...
0
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0answers
40 views

Belt Drive Shaft - What Profile is This?

I'm trying to source a similar extruded aluminum round profile, that I can attach a belt to, as in the pic below. The shaft will turn and pull on that belt. I looked at the 80-20 extrusions and ...
1
vote
0answers
208 views

How does this SpaceX Starlink ground station antenna's gear mechanism move it in both altitude and azimuth?

Ars Technica's Teardown of “Dishy McFlatface,” the SpaceX Starlink user terminal links to the YouTube video Starlink Teardown: DISHY DESTROYED! and a screenshot from there is shown below. There are ...
13
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1answer
1k views

How does a (pulley based) continuous variable transmission (CVT) work?

How does the (pulley based) CVT achieve the following? no requirement for a clutch fuel economy smooth gear transition
2
votes
3answers
177 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
votes
2answers
65 views

Dividing torque of one axle to three in varying proportions [closed]

I want to power a small mechanical monstrosity, which performs three tasks that require three separate axles. For the powering, there's a hand-operated crankshaft connected to the primary axle that ...
0
votes
1answer
57 views

How should I lubricate my gears?

I am doing an experiment testing different types of gears, the gears are fairly small, with gear 1 being approx. 35mm in diameter and gear 2 being 45mm in diameter, and both are meshed together, there ...
1
vote
0answers
28 views

AutoDesk Inventor Export Dimensions from Design Accelerator Generated Spur Gear

I'm working on modeling a turret-like mechanism in AutoDesk Inventor. Part of my design involves a rotating table. In order to accomplish this, I used the spur gear tool to generate a set of spur ...
1
vote
3answers
79 views

Mechanical Engineering: How To Amplify Kinetic Energy In Axial Rotational Gear Machinery? [closed]

When I originally posted this question 2021-04-08, I was inspired by pulley physics, especially after viewing these videos at this link and this link and this link. It is not necessary to go to these ...
1
vote
1answer
97 views

How does the diameter of a worm gear affect the amount of force needed to turn it

Can anyone help inform a discussion I'm having with fellow modellers on a model railway forum? I have a locomotive powered by an electric motor turning a 20mm diameter worm gear meshing with a spur ...
0
votes
2answers
62 views

Friction losses between spur gears: less teeth are better than many teeth?

In my project, a little Nema11 stepper motor turns for max +/-90° an handle. When the windings of the motor are not energized, the handle can be manually rotated by a human operator. The load is not ...
1
vote
2answers
57 views

What joint can I use for two thin parallel shafts to transmit both rotational and and linear power (in the axis of the shaft)?

I am here regarding a personal project but I am not a mech engineer. The shaft is a watch stem that is displaced from the crown stem. The two shafts are positioned like in the photo below but are 0....
0
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1answer
58 views

Wierd faulty gearbox FFT

I am working with a public dataset (mentioned in few papers) of vibration measurements of broken and healthy gearbox under various load. Most of the measured channels posses the same parameters no ...
1
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3answers
45 views

static friction of gear pair

Im working on a project that has gearing system integrated. From my simulation results im dealing with a relatively small amount of input force at the gearbox and would like to know if the force would ...
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 ...
0
votes
2answers
45 views

Gear configuration for a legged hexapod

I have an assignment for my Mobile Robotics course to design the drive mechanism for a legged hexapod and demonstrate its gait in motion. The idea is to design the hexapod as per the following ...
0
votes
1answer
23 views

How is the sliding velocity between two spiral gears derived?

How is the component of the velocity along the tooth equal to Vsinα for both the meshing gears? Making the relative sliding velocity Vs = V1sinα + V1sinα

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