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Relationship Between Gear Ratio and DC Motor Power Consumption

In my class, we are currently trying to understand the relationship between gear ratio and motor power consumption. Given two gears, one attached to a motor, and the other attached to a string ...
Austin's user avatar
  • 1
2 votes
2 answers
254 views

Multi-Directional Rack and Pinion Drive - Vehicle Motion Using Helical Wheels

I have a vehicle with 4 wheels. Say I replace the wheels with large helical gears (pinions). If I set the vehicle on linear helical racks, it should be able to travel in one dimension. Say I replace ...
skibulk's user avatar
  • 429
4 votes
1 answer
666 views

Getting high RPM out of a low RPM motor

I'm trying to use a 1500 RPM-rated electric motor to accelerate a (light, 25kg) shaft up to 50 000 RPM. At these speeds I figure using a belt system or roller chains is out of the question due to wear ...
Thomas's user avatar
  • 165
3 votes
2 answers
274 views

3d model gear to fit another gear

I have been trying to model a custom gear to fit on to another physical gear. I having been using this 3d model gear generator. What I know about my physical gear is that it has: (what I believe to ...
Bennett Yeo's user avatar
4 votes
2 answers
924 views

comparing backlash of different mechanisms

I have a cylinder with a shaft in its center that I need to rotate at 120 RPM on 180°, for costing reasons, I would like, if possible, to reuse the same DC motor that I already use for another system. ...
LiohAu's user avatar
  • 201
3 votes
2 answers
329 views

What is technology used to seal a gear shaft to metal frame?

I'm working on paper cut mechanism, I use gears to move blade to cut paper. I would like to get knowledge about the technique of seling gear shafts to a metal frame. It would help me in designing ...
sultan's user avatar
  • 131
6 votes
1 answer
265 views

How would you mechanically model an Earth-Moon like orbit?

I'm hoping to make a small mechanical demo (~10cm tall) that models an orbit that is similar to the Earth-Moon orbit - that is, only one side of the Moon faces Earth. I'm trying to keep it simple, so ...
John M.'s user avatar
  • 1,033
1 vote
0 answers
142 views

Rotating a small crank with a large wheel

I wonder if there's a way to rotate a small crank by turning a large wheel. Here's a diagram: Is there a way to design the slot on the wheel for the crank pin? A standard, straight radial slot won't ...
WKleinberg's user avatar
3 votes
1 answer
71 views

Canonical approach to experimenting with a gearbox design

I'm hoping to design a simple gearbox for a 1-seater car for kids. So far I'm only using discs of paper I cut out and rotating them by hand. I wonder what the canonical approach is to prototyping/...
John M.'s user avatar
  • 1,033
4 votes
2 answers
3k views

Designing non-self-locking worm gear

I see that most worm gears are self-locking but I'm looking to make my own non-self-locking POM worm gear. It'll only be of module 1. Does anyone know what needs to be changed in order to make a self-...
John M.'s user avatar
  • 1,033
0 votes
1 answer
73 views

Gear testing rig

I have two bevel small (POM) gears that I'd like to test. I'm hoping to test their strength and their maximum torque. One is 15-tooth and is around 16MM wide and the other is 45-tooth and is around ...
John M.'s user avatar
  • 1,033
46 votes
9 answers
8k views

Is it possible for a bicycle chainwheel to have a fractional number of teeth?

Background In the world of bicycle motocross, also known as BMX racing, gearing is a hotly-debated topic. Since the bikes are all single-speed, gear ratio is a fixed number defined as ...
eckza's user avatar
  • 563
3 votes
0 answers
145 views

A round, plastic pinion in a lock?

I'm looking at a teardown of a Masterlock. The guts look like this What's strange to me is the black, plastic pinion that appears to be smooth and a strangely shaped cam: Here's the cam magnified: ...
John M.'s user avatar
  • 1,033
1 vote
2 answers
4k views

Worm Gear and Worm Shaft for 2 axis

Can a worm gear be used for linear motion as well as for rotation? To be more specific. Suppose I want the worm gear to rotate as well as move forward, is it possible to achieve that ?
Rene Duchamp's user avatar
3 votes
1 answer
332 views

Nylon gears for 0.4Nm torque

I see that POM gears are often not preferred in high torque settings - but how about 0.4Nm? Is that amount of torque too much for module 1 POM bevel gears? Say they are 16-tooth. Is 0.4Nm considered ...
Kar's user avatar
  • 351
1 vote
2 answers
4k views

Gear Locking Mechanism

I would like to control the locking of a gear, using a solenoid. My original idea was to simply activate the solenoid to pull back the lock (a tooth that sticks into the gear), but that means that I'...
uncaged's user avatar
  • 71
5 votes
1 answer
2k views

Determine the sign of torques for a planetary gear system

I am trying to calculate the power distribution of a planetary gear system, specifically a Wolfrom system like this one: In order to find the output power, I need to find the torque for the rings 5 ...
user3130648's user avatar
4 votes
1 answer
11k views

Using a 'D' shaped shaft with a set screw

Suppose a 'D' shaped shaft with a 4 mm diameter like this type is fitted inside a module 1 (plastic) gear with a round hole with the same diameter. If the gear has a set screw, will this still be a ...
John M.'s user avatar
  • 1,033
5 votes
1 answer
289 views

How can I tell if a gear is pressed or threaded?

I recently bought my first lathe (A circa 50s PREMO, Australian built with tapered roller bearings) and the spindle has a little bit of wiggle parallel to the axis of the spindle. I decided to pull ...
Rob M's user avatar
  • 231
4 votes
1 answer
305 views

Are typical worms and worm gears self-locking?

Does anyone know if typical/common worms and worm gears self-locking (plastic or metal)? Are the self-locking ones specially designed (with specific angles) in order to be self-locking? By self-...
Kar's user avatar
  • 351
0 votes
2 answers
9k views

What is the relationship between drive shaft diameter and torque output?

I have a DC motor with a shaft with a diameter of x. It would produce some torque T because torque is proportional to radius. If I stuck a pulley on the shaft of radius 2x, then I would produce twice ...
Satchel's user avatar
  • 67
0 votes
1 answer
467 views

Equations relevant to gravity powered clocks and machines such as the gravity light

What equations are needed to describe the forces and properties of the kind of mechanisms used in a machine that harnesses the gravitational potential energy of a suspended weight to rotate the shaft ...
user1672299's user avatar
7 votes
3 answers
2k views

Compound gear system ratio

This might be a stupid question, but I'm new to mechanics, so please bear with me. Suppose I have a compound gearing system defined in the image below (not to scale). The green gear is the driving ...
Tom's user avatar
  • 317
2 votes
1 answer
340 views

Spur gears design

I have a problem in understanding of gears (spur gears). I designed some spur gears but I don't understand how the modulus works. I saw that this modulus is some standard thing and it's calculated by ...
Stefan Merfu's user avatar
5 votes
1 answer
824 views

How to transfer rotational energy into lateral energy only when rotating one way?

Is there a general way to convert rotational energy from a gear or something into lateral motion toward or away from the gear? I could use a piston type construction, but I only want the lateral ...
ruckus's user avatar
  • 301
3 votes
1 answer
2k views

Transform/change/convert rotation axis

I would like to know what mechanical parts can be used to convert a rotation movement from an axis to another. For example: You have the shaft of a motor rotating vertically, but you need to rotate a ...
LiohAu's user avatar
  • 201
2 votes
0 answers
352 views

Helical - Worm Drive

Is it possible to have a helical gear and a worm gear with the teeth angled the same amount, so that the helical gear can drive the worm gear, unlike a spur gear. Can the helical gear also move the ...
Recycle Bin's user avatar
10 votes
4 answers
5k views

How are high gear ratios achieved in a small space?

I have a very basic understanding of how gears work, and while trying to learn more, I've run into a small point of confusion. If a 2:1 gear ratio is achieved by having twice as many teeth on one ...
Soviero's user avatar
  • 203
4 votes
2 answers
11k views

Advantages and disadvantages of bevel gears

What are the advantages and disadvantages of bevel gears? This is what I've already found: Advantages: possibility to change operation angle Disadvantages: must be precisely mounted shafts' ...
Krzysztof Majewski's user avatar
1 vote
0 answers
428 views

Gearing for Multiple Forward / Reverse on Single Drive Shaft

This model illustrates my question: Red is a motor Green is the drive shaft Orange are nylon straps Blue are spools for the straps I want to be able to drive multiple spools in multiple directions ...
bealbrown's user avatar
1 vote
1 answer
1k views

Gears - dynamic factor $K_v$

I am trying to understand what the dynamic factor $K_v$ describes. I know that a low $K_v$ factor results in quieter and smoother work of the gear but what exactly does $K_v$ tell me?
Krzysztof Majewski's user avatar
2 votes
1 answer
806 views

Gear coupling and clearance between pitch surfaces

I have a couple of spur gears (0.4 mm module, ISO8/AGMA9 precision, 24 and 120 teeth). I want to make their backlash as small as possible. But also I don't want them to jam. Where can I get the normal ...
Felix's user avatar
  • 151
6 votes
4 answers
3k views

What is the use of gears in a device with a fixed gear ratio?

From my understanding, there are two uses of a gearing system: to change the speed of output rotation (trading it with torque), and to change the axis of rotation. Now, in a car, for example, it is ...
Karnivaurus's user avatar
3 votes
3 answers
5k views

How can I apply a load to an electric motor to simulate realistic conditions for an experiment?

I am trying to perform some experiments with a motor and I want to run it under realistic conditions (or at least not unloaded). Is there an easy way to load a motor? A couple ideas I had include: ...
Jacques's user avatar
  • 31
4 votes
3 answers
8k views

How were gears manufactured before power tools, CNC, etc

Current gear manufacturing methods for gears usually depend on power tools, or computerised machines, or something like that. However, watchmakers and clockmakers at one point in history needed to ...
Mahkoe's user avatar
  • 143
1 vote
1 answer
4k views

Finding the diameter of a Triple Thread Worm Gear

For a Board Exam Review: A triple thread worm has a diameter of 3 inches. The wheel has 25 teeth and a pitch diameter of 5 inches. Material for both the worm and the wheel is of phosphor ...
james's user avatar
  • 597
2 votes
2 answers
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, ...
electricviolin's user avatar
2 votes
1 answer
141 views

Gear that prevents another gear spinning freely

My Lego model has a winch on the front. It's a simple spindle with a reel on it with a rubberised cog for winding at one end and two cogs at the other (as shown below). Is there a technical name for ...
dtw's user avatar
  • 131
4 votes
1 answer
3k views

How to calculate if a motor is strong enough

I am building a machine for a project that should slowly tip a screen forward about 95 degrees, hold for a couple of seconds, and then slowly return to vertical. The design I am working on uses two ...
Kevin's user avatar
  • 41
3 votes
1 answer
1k views

How to limit axial movement for a key joint?

I need to design a simple gearbox for homework. I figured out to locate 2 sliding spur gears on the input shaft and 2 fixed spur gears on the output shaft. I prefer to use key joints, as they are the ...
Vorac's user avatar
  • 139
8 votes
5 answers
8k views

How can I get a stepper motor to engage with a freely spinning wheel?

I'm working on a project that uses a strong stepper motor to power a wheel that needs to be able to "coast" freely at times. The motor is too stiff when not engaged, and along with my gearing ratio, ...
nonlinearmind's user avatar
20 votes
7 answers
57k views

Effective ways to drive a single shaft with multiple motors?

To head off the "why not use a bigger motor" question, I'm a high school mentor for an FTC (First Tech Challenge) robotics team, with a bit of a soft mechanical / hardware background. They're ...
trycatch's user avatar
  • 301
8 votes
1 answer
639 views

What does "tol" mean in a gear box?

In this NASA document, it is mentioned on page 221 (239 of the pdf) that a "23 tol gear box" was used. What does that mean? A google search for "23 tol gear box" (with quotes) comes up completely ...
Rikki-Tikki-Tavi's user avatar
4 votes
1 answer
626 views

How does the optimal-gear indicator work?

Some modern cars, including models by BMW, Ford and Audi, have a system on the panel that tells the driver the next gear to use while driving, for optimal fuel economy. How does the vehicle decide ...
NG_21's user avatar
  • 201
3 votes
1 answer
1k views

How to find angle of timing gears

I am trying to figure out how to calculate either the distance or angle of 2 Idler Gears in a Timing Gear Configuration like so: I have been able to eyeball things, so they are approximate. I would ...
Andy Braham's user avatar
11 votes
2 answers
2k views

What is the mechanical element that holds a worm gear shaft in place called?

Here is an image of a worm gear. What is english word for mechanical element (two of them will be necessary for a worm gear) in which the worm shaft will "lie" and rotate? Here is one photo of the ...
etf's user avatar
  • 321
7 votes
2 answers
6k views

How to mount a load-bearing gear shaft through a wooden plate

I don't have experience in mechanical engineering so I came here to ask for help. Here is sketch of one simple construction I want to realize: Here we have 5 cm thick wooden plate, 50 cm long and 35 ...
etf's user avatar
  • 321
3 votes
2 answers
10k views

Worm gear & motor selection calculation

I am trying to build a worm gear based on a single axis solar tracker for a worm gear box. I need some guidance choosing a worm gear & drive motor for the application. These are the steps I have ...
user50949's user avatar
5 votes
2 answers
15k views

How do I calculate the gear ratio to lift a weight at a constant speed?

I have an 80 g·cm motor with a rotational frequency of 15,000 rpm. I want to lift a weight of 2 kg at a speed of 0.5 m/s. How do I calculate the gear ratio required?
lee wei's user avatar
  • 61
9 votes
1 answer
5k views

What is the benefit of additional planetary gears?

A planetary gear is a gear that rotates not around an axle but around another gear known as a sun gear, or star gear. I have designed prototype systems in the past that used a single planetary gear ...
Sam Weston's user avatar

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