Questions tagged [gears]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
22 views

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 ...
user avatar
  • 1
0 votes
0 answers
29 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 ...
user avatar
-1 votes
4 answers
41 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 ...
user avatar
1 vote
1 answer
41 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 ...
user avatar
0 votes
2 answers
23 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.
user avatar
0 votes
1 answer
16 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 ...
user avatar
0 votes
1 answer
39 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 ...
user avatar
0 votes
2 answers
54 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 ...
user avatar
0 votes
0 answers
35 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 ...
user avatar
  • 1
0 votes
3 answers
64 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 ...
user avatar
0 votes
1 answer
37 views

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?
user avatar
0 votes
1 answer
56 views

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: ...
user avatar
0 votes
2 answers
35 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 ...
user avatar
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 ...
user avatar
  • 111
1 vote
1 answer
108 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 ...
user avatar
  • 11
0 votes
1 answer
48 views

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 ...
user avatar
0 votes
1 answer
32 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 ...
user avatar
0 votes
3 answers
55 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 ...
user avatar
  • 101
0 votes
2 answers
60 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.
user avatar
  • 1
0 votes
1 answer
49 views

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 ...
user avatar
  • 1
0 votes
0 answers
27 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 ...
user avatar
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 ...
user avatar
  • 103
0 votes
6 answers
88 views

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 ...
user avatar
0 votes
2 answers
128 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 ...
user avatar
  • 1
1 vote
1 answer
93 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 ...
user avatar
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 ...
user avatar
  • 21
0 votes
3 answers
122 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 ...
user avatar
  • 3
0 votes
1 answer
54 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 (...
user avatar
  • 11
1 vote
1 answer
119 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 ...
user avatar
  • 111
0 votes
2 answers
56 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 ...
user avatar
0 votes
1 answer
15 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 ...
user avatar
-1 votes
4 answers
55 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 ...
user avatar
0 votes
2 answers
40 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 ...
user avatar
  • 101
2 votes
1 answer
145 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 ...
user avatar
0 votes
3 answers
79 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 ...
user avatar
5 votes
6 answers
1k 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 ...
user avatar
1 vote
5 answers
101 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 ...
user avatar
0 votes
3 answers
51 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 ...
user avatar
  • 143
1 vote
0 answers
29 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 ...
user avatar
  • 124
1 vote
2 answers
154 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: ...
user avatar
  • 124
1 vote
3 answers
93 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.
user avatar
0 votes
1 answer
41 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 ...
user avatar
  • 111
0 votes
1 answer
66 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 ...
user avatar
  • 103
0 votes
1 answer
74 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 ...
user avatar
  • 1
1 vote
0 answers
45 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 ...
user avatar
  • 11
1 vote
0 answers
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 ...
user avatar
0 votes
0 answers
42 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 ...
user avatar
  • 101
1 vote
1 answer
97 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 ...
user avatar
  • 133
13 votes
1 answer
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
user avatar
  • 22.6k
-2 votes
2 answers
69 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 ...
user avatar
  • 82

1
2 3 4 5
8