Questions tagged [design]

Mechanical, electronic or programmatic design of a robot.

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Force calculation for robotic arm

I built a robotic arm that consists of 3 MG 996R servo motor and 3 MG 90S servo motor. How to calculate the amount of load it can lift? Can anyone out there help me regarding this? I need step by step ...
Avra Saha's user avatar
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34 views

What joint combination gives you an 6 DoF workspace?

If you want to have a 6 DoF workspace of your end-effector you need 6 joints. But how exactly do the joints have to be ordered? For instance: A robot with 6 revolute joints where all the rotation ...
Sven Fritsch's user avatar
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1 answer
159 views

How can the ROS 2 TurtleSim turtle icon be changed?

In the turtlesim program used in many ROS 2 tutorials, there is a turtle icon that can be controlled. I would like to change this icon to be a different image that I have been provided, so that when I ...
Kaushal Bhanderi's user avatar
1 vote
1 answer
60 views

Why are bird-like bipedal robots more efficient than humanoid robots?

Well, some websites wrote that "Robotic legs with an unconventional design inspired by flightless birds can run 300 per cent more efficiently than the same device would if designed traditionally.&...
Fulano's user avatar
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Is it possible to set up intra process communications b/w 1 publisher and multiple subscribers?

I was reading this tutorial: https://docs.ros.org/en/humble/Tutorials/Demos/Intra-Process-Communication.html Is it possible to have multiple subscribers to the published message? How does the unique ...
sisaha9's user avatar
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2 answers
65 views

SCARA robot configuration subtype (first axis vertical)

I'm working on a project where I need a SCARA where the first axis is the linear / vertical one (as often seen in hobbyist configurations). Something like this: https://www.igus.eu/product/21104?C=DE&...
jrob32's user avatar
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Light weight one axis hinge name/recommendation

I'm attempting to build a crow that can stay upright even when its perch tilts. For that I need to have some single axis hinges (not u-joints). I'm using 3mm rod for my internal supports and am ...
Oldmicah's user avatar
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1 answer
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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
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2 answers
163 views

What are the pros and cons of Zip Chain Actuators in robotics? [closed]

Well, I just found out about these Zipper Chain Linear Actuators, but I couldn't find much information comparing these types to other types of actuators. For example, what is the performance of Zip ...
Fulano's user avatar
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2 answers
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Why aren't more bipedal (or even quadruped) robots made with joints/articulations similar with those found on atmospheric deep dive suits?

The sole reason I'm making this question is due to the fact that such joints/articulations would allow the electric motors to continuously move while the walking motion is performed, instead of the ...
Fulano's user avatar
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2 answers
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How to add precise amounts of ingredients in my beverage making robot? [closed]

I am currently in the process of making a robot that can make a cup of tea, when It receives the command to do so. The general idea is as follows: checks if saucepan is placed checks if milk is ...
abdullah mohsin's user avatar
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216 views

I would like to add a prismatic joint to the Z axis of the 6th joint of Urdf

I have a urdf file,urdf of UR5 robot and added a prismatic joint to the end of 6th joint of the robot with the "prismatic_joint" tag (By copying other joints and links) ...
Meric Ozcan's user avatar
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1 answer
94 views

How to calculate DH parameters for Higher Pair?

I am trying to build a robot which is having Bevel Gears connecting two links. I want to calculate DH parameters, but i am stuck with this bevel gear as when the joint rotates both angle and ...
vinay's user avatar
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4 votes
1 answer
278 views

How to perform decoupling between decision making and action execution in ROS2?

Hi I'm making a robot using: ros2 foxy OS Ubuntu Linux 20.04.2 LTS (Focal Fossa). Linux 5.8.0-59-generic I built an Action based on the tutorial Building an Action Server and Client. Then expanded ...
rasa911216's user avatar
1 vote
1 answer
361 views

Attaching an optical rotary encoder to a bicycle wheel

I am currently working on a Sixth-Form experimental physics project, the end goal of which is to build a simplified Malkus Waterwheel, and to see whether chaotic synchronization can be achieved ...
Jacob Obrecht's user avatar
2 votes
5 answers
755 views

Recommended building materials for building a robot WITHOUT 3D printer?

I have a ton of ideas for building a robot using an arduino and raspberry pi. I have an assembled the wheels and chassis, and now I am left with an ugly raspberry pi and arduino + wires. It works, but ...
NCarlson's user avatar
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Deduce all possible configuration for a given CONF param FANUC

I am working on the "CONF" parameter of FANUC Robots. The "CONF" param determine the pose of the robot (maybe to have only one inverse kinematics solution). This configuration is ...
hugosc's user avatar
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2 votes
1 answer
112 views

Significance of tf2_ros::TransformListener in constructors

Is there a reason that a lot of constructors in ROS based code take in tf2_ros::TransformListener as one of the input? I want to get an idea from the design ...
skpro19's user avatar
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1 answer
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Reducing stress on servo axle

I am designing an articulated robot arm that will not need to hold essentially any weight at its end, but that will need to perform thousands of repetitions (currently using MG 996R servos, but might ...
Obor's user avatar
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1 answer
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5 bar linkage hand exoskeleton

I have a project to design a hand exoskeleton for hand rehabilitation. The problem is that i'm thinked I only need the linkage mechanism with multiple 4 bar linkages. But because of human fingers ...
user3134909's user avatar
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1 answer
195 views

What is the best to track an object and its relative position in field?

I understand this is very conceptual. I am working on a system when I am trying to track the path taken by an object as it moves across a field. Imagine a maze built on roughly the size of a football ...
Peter Parker's user avatar
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270 views

Natural frequency of robot arm

I want to design a 3 DOF pick and place robotic arm. I've accomplished stress analysis. now i'm going to do frequency analysis. software give me natural frequencies in different configurations. but i ...
hamedmh's user avatar
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1 vote
2 answers
2k views

How to convert 2D AutoCad drawing into CODE for CNC machine (laser cutter)?

I am a student of mechanical engineering, currently working on my 3rd-year project. I am designing a sheet-metal enclosure for a belt drive. We have a common laser cutter that could be used for my ...
Electro_Boomer's user avatar
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1 answer
69 views

How to design a robot chassis so as to avoid bending issues?

I'm good on the programming, control systems and electronics aspect of robotics, but need help with a problem with mechanical design. How do I avoid bending of my chassis due to weight? It is a 2 ...
jash's user avatar
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1 answer
181 views

Differential Drive Tricycle WMR with active caster wheel

I'm doing some research for my university project and in particular it concerns a functional design project. I thought it would have been possible to design a 3-wheel mobile robot with an active ...
dinoZ9's user avatar
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3 votes
1 answer
658 views

Counterweight in arm designs

I wonder why most robotic arms use large J2 (shoulder) motors rather than counterweights. What sort of complexity do they add to the design beside increase in overall weight? In fact, rather than ...
John M.'s user avatar
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0 answers
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Proper robotic competitions for one university team (first step) [closed]

I am Bioengineering student at one Iranian middle-rank university and have a small business in building some easy medical devices (PCB and CAD designing with Programming and some market experiments). ...
Soheil Paper's user avatar
3 votes
2 answers
142 views

Robot - Wall Avoiding (Plinko Robot)

I am looking to build a robot that will travel and zig-zag down the hallway.It will be headed towards a wall at roughly 45 degrees and then use a IR LED to detect when a wall is nearby. From there, ...
CPK's user avatar
  • 31
2 votes
1 answer
292 views

Path finding: A* vs Fast marching

Context: I am working on a 20 cm x 20 cm indoor robot on a 2D terrain and I need to decide on its path planning algorithm. Algorithms: A* and Fast marching are two popular (and fundamentally ...
Vivek Bagaria's user avatar
4 votes
2 answers
398 views

What should be the ideal ratio for link lengths ( L1/ L2) of a 2 link manipuator robot with revolute joints?

I am working on making a CAD model of a two link robotic manipulator, with link lengths around 15-20 cm. I am unable to figure how to set their mutual ratio and I want to know whether there is some ...
S Ganesh's user avatar
1 vote
0 answers
27 views

Increasing suction force

I'm trying to increase the suction force of the end effector in a pick and place system. Is it a good idea to add an extra vacuum pump and put it in parallel? AFAIK, having an extra pump in parallel ...
Kar's user avatar
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1 vote
1 answer
272 views

How does this end effector work?

I've seen this linear actuator end effector on a few industrial SCARA 'bots but I am having trouble visualizing how it works internally: It looks like a type of lead screw, but the nut must spin ...
kp122's user avatar
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3 votes
0 answers
46 views

What is the corrispettive motion convention for robotic systems with X,Y,Z axis? [closed]

We built several systems coupling multiple linear micrometric stages. I can't find a standard defining the axis convention of these kinds of systems, it there are any. Regarding the system on the ...
G M's user avatar
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0 votes
1 answer
125 views

Compensator design

I got a plant $G(s)=\left(0.13s+1\right)/s^2$ to design a compensator which provides below demands: Settling time : max 2s Overshoot : max %35 Gain margin : min 10 dB Phase margin : min 30 deg ...
lsn's user avatar
  • 107
1 vote
2 answers
83 views

Block algebra and normal algebra inconsistent

I've been playing around with some block maths, mostly trying to remember how it actually works, and I've come to a simple example that should be reduced, however when doing the normal maths, compared ...
DrMrstheMonarch's user avatar
2 votes
1 answer
77 views

Artificial Intelligence and Open source pipeline for automated design, simulation and analysis of robotics systems

I have heard about open source 3D printed robotics projects (https://www.poppy-project.org/en/ is somehow obsolete example). My question is - are there open source holistic/integrated frameworks of ...
TomR's user avatar
  • 359
0 votes
1 answer
54 views

Design a robot that can apply hot glue to paper

I need to automate a process that involves applying hot glue to paper. I own a standard handheld hot glue gun, like this one: Sticks of room-temperature glue are fed in the right side. Pulling the ...
CreatedByBrett's user avatar
0 votes
1 answer
24 views

How should I create a Pangolin (Armadillo) structure?

I am new to this forum. I want to create a mechanical structure as depicted in the image A pangolin bag. And further wouls like to automate the closing and opening of the bag. But I am facing issues ...
Hrithik Baishakhiya's user avatar
2 votes
1 answer
1k 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
2 answers
89 views

Design of the baseplate of mobile robot

I need to construct a Mobile robots preferably circular type of diameter 30 cm, it will be carrying a payload of 5kg. What will be optimal thickness the baseplate considering the material as aluminium?...
5P1D3R_M0NK3Y's user avatar
-2 votes
1 answer
70 views

Why can't motors be as elegant as human muscles? Why do we have to use electromagnetism to create movement?

Pretty much as the title says. Why isn't it possible to build motors as microscopically and simply as they're built in humans? Why can't we recreate electronic nerves and muscles?
PolymorphismPrince's user avatar
1 vote
1 answer
60 views

Robotic Arm Senior Capstone. Electronics/Controls/Sensors Questions

I am a mechanical engineering student currently working on my senior capstone. My team of all MechEs has to build a robotic "arm" where the arm is really just a link/bar of aluminum. The thing we ...
Hasan A. 's user avatar
2 votes
1 answer
137 views

Challenges involved in designing an Industrial Robotic Arm [closed]

I was wondering if any robotics engineers around would kindly, provide suggestions on the following: I was recently hired by a company that wants to implement a robotic solution in manufacturing ...
MRM's user avatar
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0 votes
1 answer
59 views

Ontology/marketplace of robotics components and integration environment (BPEL or CAD for robotics)?

It should be possible to take the formal description of robotics components (in form of ontology, formal API descriptions or other kind of formal specification of the capabilities and requirements of ...
TomR's user avatar
  • 359
0 votes
1 answer
35 views

router tilting mechanism

I am trying to design a very rigid tilting mechanism for my router. For this purpose I had a look at table saws, which seem to be supported by 2 mechanisms, one in front, one at the back, called "...
chrisvp's user avatar
-2 votes
1 answer
57 views

how do i select light-weight 6dof robot?

I plan to do some scientific research, after modeling and path planning for the robot, The algorithm outputs the Joint control torque(or Joint variable), and then i want to input this result to the ...
lumw's user avatar
  • 187
2 votes
1 answer
63 views

Autonomous vessel general design

I have been asking a couple of questions here and around on autonomous boats and finally I decided to post the design and gather some feedback. The idea is to build a small vessel capable of advanced ...
Anelito's user avatar
  • 332
3 votes
1 answer
659 views

Can a state matrix have a row of zeros?

While formulating a state matrix of a system, say a system of a typical cruise controller, \begin{equation} \begin{bmatrix} \dot{v} \end{bmatrix} = \begin{bmatrix} -\frac{b}{m} \end{bmatrix} \begin{...
Aniket Sharma's user avatar
1 vote
0 answers
182 views

How is a shear pad of remote compliance device formed?

I am researching on mechanical design of remote compliance devices (RCC)†. In the RCC, manufactured by ATI, they use shear pads for lateral compliance. They mention that shear pads are ...
user17018's user avatar
1 vote
1 answer
2k views

Difference between form closure and force closure

What exactly is the difference between both the above terms? From some of the papers I realize that force closure depends on the frictional forces. Is it correct? Suppose I to grasp a cylindrical ...
qwerty123's user avatar