Questions tagged [gears]

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Gear Terminology [closed]

Can someone please explain to me what are each of the radii that are involved in creating an involute spur gear. There are so many, if you can please explain to me what the difference between each one ...
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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 ...
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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 ...
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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 ...
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1answer
53 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 ...
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1answer
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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
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2answers
62 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 ...
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1answer
53 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 ...
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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 ...
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1answer
93 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
49 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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3answers
136 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
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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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1answer
57 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
40 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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3answers
69 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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2answers
44 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
19 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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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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2answers
82 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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24 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
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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1answer
48 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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2answers
182 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
52 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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107 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 ...
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1answer
30 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
39 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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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
60 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
54 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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1answer
58 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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0answers
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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
66 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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2answers
430 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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1answer
73 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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106 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
58 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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1answer
78 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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3answers
40 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
27 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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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
47 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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0answers
43 views

Optimum spoke shape for wheels made of solid material

Currently I am designing a bicycle sprocket to be laser-cut out of 3mm steel. Steel is heavy, so I want to make some lightening cut-outs, and I want to optimize the shape of the cutouts. I will ...
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0answers
41 views

Use of pulleys in gearboxes

I'm designing a simple gearbox with some fairly strict space constraints. I was wondering if having a belt pulley inside of a custom gearbox is a serious issue for the belt. Would it get worn down ...
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2answers
822 views

Does a gear retain its mechanical advantage in a 1 2 1 ratio?

For example if the first gear has 32 teeth and the second 64, if the third also has 32 teeth would the output of the third retain the mechanical advantage created by the first 32 tooth gear powering ...
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0answers
28 views

I'm looking for the simplest way to increase rotational speed from 120 to 5,000 rpm for a light duty device

I'm currently designing a device and want to increase speed from 120 to 5,000 rpm. Device is lightweight, hand operated, free spinning, low torque in/out. Picture a cheap fertilizer spreader from Home ...
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1answer
49 views

Precision of a steeper motor and gears vs multiple motors

We are a student team trying to design a low cost CNC plasma cutting machine. The CNC will be a table with two rails and a bridge moving on them in which the head of the plasma torch will be. Now we ...

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