# Questions tagged [wheel]

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### Noisy Wheel odometry sensor simulator

I'm trying to simulate an accurate wheel odometry sensor in gazebo, or at least with some noise, in order to perform some localization tests and see the localization error for different methods. From ...
2k views

### Wheel encoder Tick calculation

Sorry for being a newbie. Can somebody explain me how many ticks a wheel encoder would deliver (based on one complete wheel rotation), if I have a slice with 500 windows? Is the assumption correct, ...
• 13
36 views

### Looking for a wheel

If this is not the right community please point me in the right direction. I am looking for a speed measuring wheel similar to the one in the picture.. What is it called? I have googled for a ...
138 views

### Calculate body speed in m/s with weight in the equation?

UPDATE: I have clarified my question for answerers to better understand what I am asking If I have a flywheel, like the one shown in this image, and I know the torque, weight distribution, and weight. ...
• 127
1 vote
1k views

### Rotate while strafing with mecanum wheels

I have a robot with a drivetrain that is comprised of 4 mecanum wheels. These wheels are able to move vertically and horizontally, as well as rotate. The robot is square (18in x 18in) with the front 2 ...
1 vote
94 views

### Where to buy cheap motors and mechanical parts for hobby robotics applications? [closed]

My kids want to get into robotics, where Online can I buy the motors (dc,ac,stepper...) and mechanical assembly (nuts, bolts, sheet metal, springs, rods...) for a very affordable price, you know I ...
• 111
30 views

### Maximizing the Coefficient of Friction Between Two Surfaces

I am new to this site so please let me know if I can improve my question. A component of a robot I am designing includes a four-wheeled carriage that travels linearly on an aluminum surface. The ...
1 vote
2k views

### How to drive mecanum wheels robot: code or algorithm

I have a robot with four mecanum wheels and I would like to make it move correctly by using a RC transmitter (my controller has two sticks and several buttons, each stick has a proportional range of [...
17 views

### Gyroscope signal when mounted on a deflated tire

Before I do the experiment, I am a bit confused about the expected signals provided by a 3-axis gyroscope (angular velocities vs. time) mounted on the edge of a (slightly) deflated car tire when the ...
2k views

### What are wheel ticks and wheel impulses?

I'm tracking the position of a vehicle along a certain trajectory using the Kalman filter and we have odometry data provided to us which gives the x-position of the vehicle, y-position of the vehicle ...
• 29
227 views

### Can Swedish wheels be used in two wheeler configuration?

Can we use any of the Swedish 90°/45° Omni or Mecanum wheels in two wheeler configurations?
• 101
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### What are the differences between wheel and manipulator joint encoders?

As far as I understand the joint encoders output the angle and the wheel encoders output speed. Is that accurate? In either case, how do the differences affect the kinematic calculations, as in path ...
• 155
1 vote
389 views

### 4 Wheel Differential Drive Robot with different speeds

Differential drive robot with 4 wheels, If for example the back wheels were using different motors than the front ones ( ie : running at a faster/slower speed ) in general, would that generate more ...
• 11
1 vote
158 views

### How to turn direction of 4 planar wheels into up/down motion?

For the head in a 2D plotter I have 4 gears in an X configuration in the same plane. The gears are driven by belts from the outside in different combinations. The top and bottom gear can be turned in ...
484 views

### How to simply connect a plastic wheel to plastic body of a robot?

I have a robot that it's down part is something like this photo: http://www.sanatbazar.com/components/com_jshopping/files/img_products/full_Capture3.JPG . This chassis has 4motors and 4wheels are ...
• 201
1 vote
101 views

### What type of wheel is preferable for a soccerbot?

After a few days,there will held a competition in our varsity.in this competition the task is,my robot will have to play soccer.this is a one to one manual game.I am thinking of building a robot ...
7k views

### Wheel Odometry Covariance Matrix for Custom Robot

I have been looking around in the forums, but could not find any answer for how to go about getting the wheel odometry covariance matrix for a custom built planar robot (I found some posts related to ...
370 views

### Angular momentum of rimless wheel in Passive Dynamic Walking

In Tad McGeer's work, Passive Dynamic Walking, in 1990, he mentions the rimless wheel model, which is used to approximate the bipedal locomotion. I can't understand why the angular momentum is written ...
• 43
1k views

### Choosing the right Mecanum wheel

I am part of my college robotics team which is preparing for Robocon 2017. We have used Mecanum wheels in last Robocon competition, but we have faced huge slip and vibration. I have looked for all ...
• 23
2k views

### Wheel encoder triggers interrupt too many times

I am building a simple robot with two driving wheel. I want to control the wheel rotation using a wheel encoder like this one. Here is a code I have on Arduino to try to understand the problem I'm ...
• 298
743 views

### High-traction thin tires vs Wide moderate-traction tires? [Sumo-bot] [closed]

I am building a sumo-bot and our competitors have thin sticky tires, while we have wider and less sticky tires. The diameter is the same, and the gearbox/motor is the same. Who will win? PS: Sticky ...
5k views

### Calculating Required Torque

Say I had an object with 4 motors/wheels attached (in a fairly standard arrangement). I need to calculate the amount of torque required from the motors to be able to move the object of x kilograms ...
2k views

### What is the technical name when robot wheels are aligned to perform spot turn?

I have a robotic simulator that enables a 6 wheel rover to perform spot turn. To prepare the rover to spot turn, I have to arrange/align the wheels in such a fashion: ...
• 199
2k views

### What is the difference between the two different types of Mecanum wheels?

While looking at Mecanum wheels, I noticed that there are two different designs that are popular. One type holds the rollers in between the wheels frame, and the other holds the rollers from the ...
• 31
1 vote
1k views

### Where can I buy heavy-duty Omni Wheels? [closed]

Where can I buy multi-directional omni wheels? I'm specifically looking at something which can support in excess of 100kg/wheel, so around 400kg in total. Also, a possible mission profile would ...
• 158
1 vote
251 views

### Securing a disc/wheel to a shaft

I am in a situation where I need to secure a 20" wheel made of 3/4" thick MDF (of my own making) onto a 1-1/4" precision-ground steel shaft, and this joint needs to be strong enough to convey a rather ...
• 111
249 views

### Forward Kinematics Two fixed standard wheels

What would the equations be for the robot's angular and linear velocity at P and also P2? I think I'm doing it wrong... WL = left wheels angular velocity WR = right wheels angular velocity For P I ...
8k views

### Kinematics of a 4 wheeled differential drive robots

I have a 4 wheeled differential drive robot, like the Pioneer 3-AT. There are only two motors, one for left wheels and one for right wheels. I want to send velocity commands to the robot, I'm using ...
270 views

### Does a vehicle with defferential gear still move straight?

I am in the concept phase of a driving robot. The two wheels on the front axle will be powered, while the rear will be dragged along. The rear is also responsible for steering but this has noting to ...
• 299
1k views

### How do I measure the distance that a cord (string) has moved?

For a pet project, I am trying to fly a kite using my computer. I need to measure how far a cord extends from a device. I also need to somehow read out the results on my computer. So I need to ...
• 349
188 views

### How do I design for a target speed?

I need to make an omni wheeled robot platform (4 wheels), which should go at a minimum speed of 15 cm/s. I have an idea for the design, but since this is my first time doing something like this I ...
• 161
105 views

### Remote car controlling

Before I start asking you for help let you know that I am newbie in electronic field. All I want to know is the principle of wheel rotation (left-right) from remote car gadget. I am not talking about ...
13k views

### Calculating the efficiency of Mecanum wheels

I'm part of a FIRST Robotics team, and we're looking into using Mecanum wheels for our robot. What are the advantages and disadvantages of using Mecanum wheel versus regular ones? From looking ...
• 415