Questions tagged [gears]
The gears tag has no usage guidance.
339
questions
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1answer
39 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
votes
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
votes
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
votes
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 ...
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
96 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
votes
3answers
51 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 ...
5
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6answers
964 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 ...
1
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5answers
77 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
votes
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 ...
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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:
...
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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
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 ...
0
votes
1answer
52 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 ...
0
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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 ...
1
vote
0answers
24 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 ...
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
1answer
61 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 ...
13
votes
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
2answers
64 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
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
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2answers
61 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 ...
2
votes
3answers
175 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 ...
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 ...
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 ...
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
22 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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0answers
20 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 ...
1
vote
2answers
114 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 ...
0
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0answers
28 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, ...
0
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1answer
79 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 ...
0
votes
1answer
81 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 ...
0
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2answers
646 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-...
0
votes
1answer
115 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 ...
1
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0answers
204 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 ...
0
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1answer
35 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.
...
0
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1answer
43 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.
1
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0answers
35 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?
2
votes
0answers
82 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 ...
0
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1answer
58 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 ...
0
votes
1answer
64 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 ...
2
votes
0answers
165 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 \...
1
vote
3answers
77 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 ...
2
votes
2answers
434 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 ...
