Questions tagged [design]
Mechanical, electronic or programmatic design of a robot.
147
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3
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Rocker bogie suspension stability
From the designs usually shown of rocker bogie systems, the whole weight of platform seems to be supported by only one rod, be it differential bar or gear. Isn't this a bit unstable system because if ...
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3
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2
answers
131
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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, ...
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3
votes
0
answers
46
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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 ...
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2
votes
5
answers
606
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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 ...
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2
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1
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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 ...
2
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1
answer
2k
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What is torque bandwidth in actuated joints and how does it affect the control systems?
The rest of my student team and I are in the process of redesigning an exoskeleton and building it based on an existing one. From the papers that we have been reading there are some references to low, ...
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2
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2
answers
387
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Stewart platform as robotic wrist joint
I'm planning the design of a wrist for a humanoid robot. I would like to choose a design that is sturdy while allowing for dexterity comparable to a human wrist.
One option that was presented to me ...
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2
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2
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268
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idea for web application in robotics [closed]
I am learning and I am interested robotics, but also I need to update my web development skills so the question is - is there any idea for good web application that could be connected with robotics - ...
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2
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2
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228
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How do I select the best configuration for a known workspace, load and task?
Given workspace constraints, load and task to be done, how do I select the best configuration of my robot? How do I select between a cartesian or Scara robot for instance? How do I select a ...
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2
votes
1
answer
558
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Verifying motor selection calculations
I'm trying to select a brushed DC motor for a project. I tried following the advice on sizing electric motors, mentioned in this question, but a few details were missing, and I'm unsure if I properly ...
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3
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How to decide about the length of a robotic arm, the base of it and the torque?
I am designing a remote controlled robot which will have a base with three wheels, two of them will be simple wheels at the back of the base and the third will be a ball wheel at the front. It will ...
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2
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1
answer
88
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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 ...
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2
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1
answer
66
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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 ...
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1
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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 ...
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2
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1
answer
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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 ...
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2
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2
answers
114
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How to make door opening to the top
I need to make this construction (door is closed by default, door is opened to the top). This is the scheme:
Red rectangle on the picture is the aperture, blue rectangle is the door (weight is about ...
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2
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1
answer
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Autodesk Inventor 2013: Rounding only at specific edge
I am using Autodesk Inventor 2013 and I need to round a component of a device. I want to round the green marked edges, but not the red marked. But when I click "round", then the bottom edge will ...
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2
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1
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328
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LQR design with low effort
I am trying to implement a controller for an inverted pendulum using LQR (with MATLAB command lqr(A,B,Q,R)). The problem is that the motors are relatively weak, so I tried to increase R, but ...
2
votes
1
answer
155
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Equation to limit rate of change of end-effector in X and Y coordinates
Some vector math is involved here so prepare yourself.
I am developing a robotic arm that moves in two dimensions. It is a rotary-rotary design which looks roughly like the picture in this post:
...
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2
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1
answer
253
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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 ...
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1
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124
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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 ...
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2
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1
answer
60
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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 ...
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2
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1
answer
152
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Automatic sliding window shutter
I want to build an automatic sliding window shutter and need help
with part selection and dimensioning.
Some assumptions:
window width 1.4 m
sliding shutter weight 25 kg
max speed 0.07 m/s
max ...
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2
votes
1
answer
6k
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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 ...
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2
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3
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263
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Gears in Autodesk Inventor are looking weird
I use Autodesk inventor professional 2014. I design my gears using the design accelerator. However, whenever I create gear trains, parts of certain gears become transparent. This seems completely ...
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2
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1
answer
3k
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Most material efficient quadcopter frame
I haven't made or flown any quadcopter, but I am fascinated by them.
But when looking at the frame of a lot of designs, after whachting this video I wondered why a lot the frames are in an X shape. ...
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2
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2
answers
79
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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?...
2
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0
answers
118
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What happened to Butler's car?
Having read the article "This Car Has Electric Brains" in Popular Mechanics, August 1958 I have some questions.
How practical were his methods? Was his work acquired by a car manufacturer or some ...
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7
answers
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Aluminum vs Carbon Fiber
So building a quadrocopter from scratch HAS a lot of decision making, and I need some input on the material choice.
I have short listed Aluminum and Carbon Fiber for the Arms and support of the ...
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1
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1
answer
1k
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Good book on mechanisms [closed]
I am working with students (9th & 10th grade) on robotics and wanted to get a good book which covers basic mechanisms. Does anyone have any recommendations. Searching Google or Amazon yields ...
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2
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116
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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 ...
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2
answers
80
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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 ...
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1
answer
95
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Is this large bipedal robot real or realizable?
I saw this link today. This robot seems real, but redditors on a reddit thread argued that it might be CGI. It doesn't seem unfeasible to make such as robot IMO. There isn't anything out of the norm ...
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1
answer
56
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Design in the robotics world [closed]
Apologies if this isn't really the right place to be asking, but I was wondering whether third party design firms are ever contracted to design industrial and or consumer robots?
If not is it ...
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2
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1k
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3 way check valve
I am working on a micro dispensing system, using syringe pump. The design involves a syringe on top to be moved by stepper motor. There would be one liquid reservoir form which the syringe would pull ...
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1
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3
answers
344
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Dynamic simulation of compliant elements in quadruped robot
I have a preliminary design for a legged robot that uses compliant elements in the legs and in parallel with the motors for energy recovery during impact as well as a pair of flywheels on the front ...
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1
answer
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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.&...
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1
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1
answer
240
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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 ...
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1
vote
1
answer
58
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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 ...
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1
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2k
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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 ...
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1
answer
277
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is designing a pcb with multiple controllers a good schematic design?
I am trying to design a bot, it has to measure the temp I am using an 8051 so the adc is taking up a lot of i/o pins so I am thinking of switching it out with a thermostat or put another controller ...
1
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1
answer
58
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How to distribute tension load on a three footed claw?
Good day!
I am helping my little ones 6 and 7 to develop a robot that can pick up and stack cubes three high as well as gather blocks. They came up with the design that enables them to pick up ...
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1
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1
answer
50
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PCB making at home [closed]
I've made many PCBs at home but still there are some mistakes. I tried ironing, drawing methods but it doesn't work very well. I use eagle CAD for design PCBs. Please help me.
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1
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142
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What type of mechanism is this?
Held and rotated by the knurled ends, one in each hand, the silver spokes rise and fall in order for the assembly to rotate. What is it, some companies' salesmen show tool? Found in an old building, ...
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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 ...
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2
answers
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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 ...
1
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1
answer
89
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Square with hinge on all four sides
I want to make a component that will be a square plate that will behave like it has a motorized hinge on all four sides. That is, it can "open" by pivoting around any one of its four sides. I want it ...
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1
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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 ...
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1
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1
answer
309
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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 ...
1
vote
0
answers
565
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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 ...
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