Questions tagged [design]

Mechanical, electronic or programmatic design of a robot.

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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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2answers
112 views

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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1answer
140 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 ...
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2answers
327 views

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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2answers
86 views

Artificial Intelligence Software Packages: Professionals, University education is oft' a step behind. What's actually being used? [closed]

Currently using Windows 8, what software packages for artificial intelligence programming (robotics branch) are used in today's professional environment as standard. Lots of internet suggestions, but ...
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4answers
842 views

What is the cheapest way to detect and identify vehicles entering a gate in real time?

I want to detect and identify each of the vehicles passing through a gate. I have the live video feed of the gate which I initially thought to process and detect the number plates with the help of ...
2
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2answers
151 views

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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1answer
2k views

Mechanical design for base of robotic arm [closed]

I am using DC motors to build a robotic arm. I want to make the base shoulder (which rotates and lifts) more stable and stronger. How should I design this using DC motors? Also I would like to put ...
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1answer
369 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
550 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 ...
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1answer
67 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 ...
2
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1answer
501 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
63 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
49 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 ...
1
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1answer
49 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
201 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 ...
3
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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 ...
4
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1answer
733 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 ...
3
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1answer
670 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 ...
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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
205 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
285 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 ...
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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
552 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 ...
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1answer
682 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? ...
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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
110 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 ...
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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
701 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
203 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
484 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 ...
0
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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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3answers
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
524 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 ...
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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. ...
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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 ...
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2answers
322 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
338 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
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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: ...
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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 ...
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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 ...