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Questions tagged [design]

Mechanical, electronic or programmatic design of a robot.

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1answer
364 views

Programable Drone with robotic arm and hand?

I was just wondering if it was possible to buy or build a programmable drone with a robotic arm,hand, knife. I want to program a drone to harvest crops. -object recognition from live video stream to ...
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5answers
539 views

Quadcopter frame design

Quadcopter frames seem to consistently follow the same X design. For example: I'm curious to know why that is. It certainly seems like the most efficient way to use space but is it the only frame ...
1
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1answer
64 views

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 ...
4
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1answer
76 views

How important are events like “Robocup” to the advancement of Robotics in general?

Are events like Robocup advantageous to the development of robotic advancement? Or is it merely entertainment which advances robotics by allowing entry level participation which helps maintain ...
1
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1answer
478 views

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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2answers
62 views

What is the cheapest way to make led sensitive to sound around?

There is always a way to do this using arduino, rasberry pi etc. However, in many cases in discussion in forums i've come across things where whole 'logic' can be uploaded to $0.50 chip. Instead of $...
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0answers
48 views

Heavy omnidirectional platform suspension

I'm planning to build an omnidirectional platform that will support about 180kg robotic arm. The platform will be equipped in meccanum wheels. I would like to have some kind of suspension to avoid ...
1
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1answer
48 views

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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1answer
48 views

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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1answer
192 views

Lifting Robot To Lift Small Crates [closed]

I am trying to design a robot to lift tote-crates and transport them around in a localized area. I want to be able to carry 3 tote-creates at a time. This robot needs to be able to pickup the creates....
2
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5answers
1k views

Why Make Bipedal Robots?

A friend and colleague of mine who studies robotics says that bipedal robots present much greater challenges for stability and locomotion than those with more legs. So why is there so much effort to ...
2
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1answer
6k views

How to find a solution for quadcopter PID control

I've built a quadcopter and a rig to safely test it on. I'm working on the PID for controlling the roll pitch and yaw. I understand how a PID works on a more simple plant like say a robot with wheels ...
3
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1answer
655 views

Submarine screw and the isolation from the water [duplicate]

How does the submarine prevent water flow through the screw mechanism? The mechanism rotates the screw so there should be a little gap, how come the water doesn't come through this gap in to the ...
2
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1answer
657 views

Linear slider motor mount location - Pros/cons

I'm currently designing a linear camera slider, that will be used to hold camera equipment weighing just about 15 Kgs including all of the lenses and monitors and everything else. For those who don'...
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2answers
1k views

What are the calculations for a badminton robot and mechanisms?

I am designing a badminton robot but i am very confused about mechanisms needed for a badminton robot and various calculations needed for millisecond response.I am also confused about calculations ...
1
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1answer
133 views

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, ...
2
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1answer
47 views

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 ...
2
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3answers
193 views

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 ...
3
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1answer
2k views

Alternative way to perform Pole zero cancellation?

I've read a lot places that making a controller which cancels the unwanted pole or zero is not good designing practice for designing a controller.. It should make the system uncontrollable which off ...
2
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1answer
280 views

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
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3answers
6k views

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 ...
3
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3answers
527 views

Atlas Robot Reference

Boston Dynamics keeps making great robots, however, I dont see any papers that they publish. Although now I can find papers on people using the ATLAS robot, I can not find an original paper detailing ...
6
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1answer
681 views

What do quadcopter propeller specifications mean?

I'm trying to figure out the diameter of tri-blade propellers. I found a 7x3x4.5 blade, I'm trying to understand the measurements. Is the '7' the length of the blade giving the prop a 10.5" diameter? ...
7
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2answers
3k views

Robotic part to dispense candy

I'm a complete newbie trying to build a simple robot that dispenses candy (M&M, skittles, etc). However, since I'm not familiar with the field, I'm having a hard time googling because I don't ...
0
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1answer
109 views

Emulation of an Orrery

Orrery is a clockwork model of the solar system. I am trying to emulate one in 2D. Now, to emulate, I need to know what goes on inside. Can someone please explain the basic principle behind the ...
7
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2answers
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 ...
2
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0answers
117 views

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 ...
3
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1answer
678 views

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 ...
7
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3answers
2k views

How to open a sliding window?

I live in an apartment that has sliding windows in it. The apartment is naturally warm because we live above a mechanical room, such that we either opened the windows or ran the air conditioning ...
3
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1answer
197 views

Is finished plywood a comparable prototyping substitute for polyoxymethylene?

I'm working on a robot with a team, and we're building our robot out of acetal polyoxymethylene (POM) (specifically, delrin) plastic. However, we'd like to prototype the robot before we build it out ...
5
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1answer
479 views

Gears modeling in Google SketchUp and SketchyPhisics

I'm trying to make differential in Google SketchUp using this tutorial http://support.ponoko.com/entries/21249896-Gears-and-Joints-with-SketchUp-Sketchy-Physics for gears modeling. But I have problem: ...
3
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2answers
2k views

Design Calculations & Mathematical Modeling of Tricopters

I have been studying about building a tricopter. But I couldn't find the design calculations or mathematical modeling of the tricopter any where over the internet. What are the mathematical ...
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1answer
100 views

What modelling tools are available to design a robot [closed]

I am planning to build a robot. 1) What free or low cost robot modelling tools exist.
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2answers
6k views

How do I motorize the elbow socket and other joints in a powered exo-skeleton?

How would you motorize the joints in an Iron Man suit? You need something fairly shallow, I would think, probably dual servos sitting on either side of an elbow or knee joint or either side of your ...
5
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2answers
510 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 ...
2
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1answer
3k views

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. ...
1
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7answers
1k views

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 ...
6
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2answers
316 views

Drone targeting

Imagine a "drone" and a target point on a 2d plane. Assuming the target is stationary, there are eight parameters: ...
5
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1answer
334 views

Dynamic braille interface

I'm a newbie in robotics, and I'm doing a project on dynamic Braille interface. Basically it's a 8*8 array of pins, which can be either totally up or down. How to use least motor as possible? I'm ...
2
votes
1answer
146 views

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: ...
12
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3answers
8k 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 ...
9
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4answers
3k views

What are human-friendly terms for mobile-robot orientation and relative direction of non-robot objects?

Within robotics programming, orientation is primarily given in terms of x, y, & z coordinates, from some central location. However x, y, z coordinates aren't convenient for rapid human ...
3
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1answer
819 views

Which is easier/cheaper: Hbridge vs ESC for controlling a motor?

I was able to find a small ESC for about $12 off of ebay. If you were designing a robot, would you see that and think? \$12 bucks for an ESC that connects to simple pulse-wave interface - sign ...
8
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2answers
715 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 ...
2
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2answers
208 views

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 ...
8
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1answer
3k 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 ...
7
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2answers
268 views

Is there a tool for building and analysing robots (kinematics, control) visually?

I am reading research papers about robotics and many of them follow the same pattern: some construction is established kinematical formulas are read from the mechanical structure the state space is ...
12
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3answers
764 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 ...
8
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2answers
789 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 ...
12
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2answers
3k 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 ...