Questions tagged [gears]

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41 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 ...
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3answers
59 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 ...
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1answer
83 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 ...
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2answers
43 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 ...
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2answers
57 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 ...
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2answers
46 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....
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2answers
103 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 ...
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1answer
51 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 ...
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3answers
36 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 ...
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2answers
87 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 ...
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3answers
909 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 ...
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1answer
325 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 ...
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1answer
45 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 ...
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2answers
43 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 ...
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1answer
18 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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3answers
178 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
19 views

How is the equivalent spur gear diameter of a helical gear equal to (d/cos^2α)?

The book I've got says that the equivalent spur gear radius(re) = (Semi-major axis)^2/(Semi-minor axis) of the ellipse made by the cut-section normal to the teeth of the helical gear. There is no ...
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1answer
46 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&...
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2answers
65 views

Criteria for gear design

Updated with comments/answers from community to make more complete I'm trying to understand why gears are designed in some specific way instead of another. So far my understanding is that: energy is ...
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1answer
73 views

Can a face gear be designed with symmetrical teeth to enable the pinon to slide inwards-outwards?

A face gear tooth is asymmetrical (designed on Kissoft) in the direction towards the center vs the rim of the face gear. . The pinon, on the other hand, is symmetrical along its tooth length. Would it ...
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0answers
20 views

Motor Torque Required in a Reciprocating Compressor

I am working on a Univerity project involving a reciprocating compressor and I am having trouble verifying the motor's torque requirements. I am relatively happy with my calculation method, however, ...
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1answer
146 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 ...
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1answer
56 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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2answers
59 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-...
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1answer
37 views

How to scale up a gear's diameter, increasing number of teeth and keeping teeth size constant?

I'm trying to use a gear system to run a rotating circuit board which will be attached to the larger of two gears. I have a set smaller gear for the rotation which has 0.350" diameter gear with ...
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1answer
57 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 ...
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1answer
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 ...
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6answers
6k views

Why does a gear have extra holes?

In a gear you normally have a center hole for the shaft to be put into. Why do some gears have holes surrounding that center hole? Is it for weight reasons? Does it add stability? Is it so you can add ...
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0answers
58 views

Can 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 ...
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1answer
29 views

Sprokets on rotating body

Sorry I'm having a migrane and can't think rn, which is why I am posting such a basic question for confirmation... The above diagram shows two sprockets on a beam which is attached to a driven gear. ...
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1answer
36 views

What is the angle of twist in end point A?

Can anyone please explain this question to me? I am okay with answering a gear assembly with 2 gears at a time. But the third one here is confusing me.
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0answers
29 views

What are the limits of small 3D printed gears?

How much tangential force should I expect a 10~20mm pitch diameter/1.5mm gear module 3D printed rack and pinion system to support without breaking nor sliding?
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0answers
49 views

Does it matter what direction a herringbone gear turns?

Obviously, the forces and pressures should mostly be the same, but just in reverse. But when play, flex, and such are accounted for, are there any subtle differences to having a herringbone gear turn ...
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1answer
52 views

How do I interpret this DC motor datasheet?

Problem summary: I need to produce about 0.289 Nm with a rack and pinion system and compress 24 mm of a 110 mm x 21.6 mm, 0.99 N/mm steel spring. I thought about using with a 10mm pitch diameter gear ...
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1answer
50 views

Involute Gear Tooth Width Explanation

I was reading: https://www.tec-science.com/mechanical-power-transmission/involute-gear/geometry-of-involute-gears/ Which goes over construction of involute gears, Everything else makes sense but I am ...
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0answers
58 views

Advice on spring launcher project

I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
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3answers
59 views

What generates more friction? Spur gears or a timing belt?

In my project a knob (usually rotated by hand) can be turned also by a stepper motor. On the other hand, when the motor is not energized, the knob can be rotated manually as normally. To transmit the ...
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1answer
55 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 ...
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2answers
426 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 ...
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2answers
743 views

Mounting a timing pulley on a ball screw shaft

I have a pretty basic question. I need to install a timing pulley on a ball screw shaft (6mm): http://uk.rs-online.com/web/p/products/2816419/ The processed end (the pointy side) of the shaft is ...
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0answers
71 views

one way bearing in solidworks

I'm relatively new to solidworks and i would like to know if there is a way to mate a bearing in solidworks such that it acts as a one way bearing. In the rack and pinion setup in the figure, the rack ...
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26 views

Designing a hypoid gear set for 3D printing

I want to design a hypoid gear set with a ratio 2:1 for 3D printing with an ofset of 8 mm but I do not know where to start. Otvinta.com has a calculator and a tutorial to go with it but the gears do ...
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1answer
186 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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2answers
157 views

Engage and disengage DC motor from free-spinning reel

So i want to have a reel (~4cm diameter) that will pull a ~80cm string with a torque of ~8kg-cm (edit: thanks for the clarification). To pull I want to use a gear motor. E.g. 12V DC motor like this: ...
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1answer
53 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 ...
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2answers
191 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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3answers
35 views

What is a gearbox with switchable outputs called?

I need a mechanism with which one motor can drive one of two outputs. So only one output should be active at a time, but the mechanism should be able to switch between the outputs. What is a mechanism ...
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0answers
25 views

Can we reduce pitch of a lead screw to reduce backlash of the lead screw?

In gear design, the backlash is introduced in the design itself (not by tolerances of manufacturing) to allow free meshing of the gears. The backlash in the design can be minimized by reducing the ...
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0answers
46 views

Building a custom indirect actuator, any thoughts?

I’m trying to create a custom indirect actuator, that is controlled by a microcontroller, for a custom robotics project. I have selected motor and gears (according to Fd = W = T2*pi) so that the ...
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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 ...

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