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Questions tagged [design]

Mechanical, electronic or programmatic design of a robot.

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19 votes
3 answers
3k views

What is the best way to power a large number (27) servos at 5 V?

I apologize if this question may sound a little vague. I am working on a robotics project that will contain 27 servos of various sizes and I am having trouble figuring out how they should be powered. ...
user avatar
22 votes
4 answers
4k views

Why are quadcopters more common in robotics than other configurations?

I've noticed that almost all research being done with helicopter robots is done using quadcopters (four propellers). Why is there so little work done using tricopters in comparison? Or a different ...
golmschenk's user avatar
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22 votes
5 answers
2k views

Is it better to have batteries distributed at the rotors or the center of the multicopter?

I've seen 3 approaches to mounting batteries on a multicopter: All the batteries rigidly mounted near the center of the airframe All the batteries in a bag hanging under the center of the airframe ...
David Cary's user avatar
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7 votes
2 answers
4k views

How to know the desired orientation of a quadcopter?

I am trying to simulate a quadcopter model on Simulink. I want to implement a PID controller for each of X,Y,Z and phi,theta, psi angles. PID gets the error, as input, which is to be minimized. For ...
Moayad Hani Abu Rmilah's user avatar
2 votes
1 answer
199 views

Inverting a transform (Reading J Craig's book on Robotics)

From Introduction to Robotics by J.J. Craig, chapter 2, Page no. 36: Could anyone explain how that equation was derived/formed? I am stuck on this page due to failing to understand where the equation ...
Prasanna Deshpande's user avatar
18 votes
2 answers
23k views

Wheels vs Continuous Tracks (Tank Treads)

I'm building a small robot using some cheap Vex Robotics tank treads. However, my choice of picking tank treads is almost purely based on the fact that they seem like more fun than wheels. I don't ...
golmschenk's user avatar
  • 1,564
14 votes
3 answers
1k views

How can I control a fast (200Hz) realtime system with a slow (30Hz) system?

We are currently designing a mobile robot + mounted arm with multiple controlled degrees of freedom and sensors. I am considering an architecture in two parts: A set of realtime controllers (either ...
arennuit's user avatar
  • 609
13 votes
2 answers
5k views

Differences between Ackermann steering and standard bi/tricycles concerning kinematics?

I got the following homework question: What are the general differences between robots with Ackermann steering and standard bicycles or tricycles concerning the kinematics? But, I don't see what ...
Daniel Jour's user avatar
13 votes
2 answers
2k views

Is it better to have weight distributed over the wheels or the center of the robot?

When designing a standard 4 or 6 wheel robot, is it better to have the weight distributed primarily in the center of the robot, or over the wheels, or is there no difference? Specifically, which ...
Michael0x2a's user avatar
12 votes
3 answers
11k views

When should FPGAs be used in Robotics?

FPGA has good points such as a lot of IO points but then again you need to think things on very low level with flip-flops and pioneer on areas where things are not yet mature -- for example see this ...
hhh's user avatar
  • 281
10 votes
2 answers
972 views

Are power and torque required related in some way?

I am designing a new platform for outdoor robotics and I need to calculate the power and/or torque that is needed to move the platform. I have calculated that I need about 720 W of total power to move ...
Plecharts's user avatar
  • 419
9 votes
1 answer
4k views

Building Robotic arm joint

I am very new to robotic design and I need to determine what parts I will need to assemble an arm joint. The joint will contain one timing belt pulley which a remote motor will be turning, a forearm ...
user912447's user avatar
8 votes
2 answers
1k views

Getting started with robotic arm design

I would like to design a robotic arm to hold a weight X at length Y (in my case I want to hold X=2.5 lbs at Y = 4 inches). Starting out simply, I would like try building an arm with a gripper plus one ...
Jon's user avatar
  • 141
5 votes
6 answers
617 views

Effectiveness of a Mobile Robot In Relation To Mass

Do mobile and/or autonomous robots become more or less effective the bigger they get? For example, a bigger robot has bigger batteries, and thus bigger motors, whereas a smaller robot has the exact ...
OneChillDude's user avatar
5 votes
2 answers
586 views

If you can create pure yaw motion with a quadcoptor then why won't this work with a tricoptor?

An answer to the question Why are quadcopters more common in robotics than other configurations? said: You need 4 degrees of freedom to control yaw, pitch, roll and thrust. Four props is therefore ...
Mark Booth's user avatar
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2 votes
1 answer
2k views

How can I attach an arm to a double-flat drive stepper motor?

This is my first robotics experience, outside of one class 10 years ago. I've been Googling this question for about an hour but I can't find an answer! I'm using a ROHS Step Motor 28BYJ-48 (with an ...
CreatedByBrett's user avatar
2 votes
1 answer
6k views

Type of servo and torque calculation required for a 2axis robot arm

I am trying to build a 2-axis robot arm with pan and tilt mechanism. The gripper/holder will hold an object weighing 300 grams. The total weight of the arm including the motors will be around 2 kg. I ...
Abinaya's user avatar
  • 21
0 votes
1 answer
65 views

How to design a representative drive cycle based on speed, acceleration, and torque requirements?

I recently came across the topic of "drive cycle design". I would like to learn more about this as I delve into motor and RC vehicle design. Given: the RC vehicle must achieve 25mph max/...
tniles's user avatar
  • 111