Questions tagged [mechanism]

A mechanism is a device designed to transform input forces and movement into a desired set of output forces and the movement.

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48 views

Name of the linkage (or carriage) in video

I am trying to find the name (nomenclature) of the linkage (or carriage) that is being driven by the dual linear servo (actuator) arrangement in the following Youtube videos: Servo Basic Concepts ...
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527 views

Connecting two servo motors to drive one shaft [closed]

I need to connect two servo motors (with internal position control) to rotate one shaft (to control its position), is that possible? and how to avoid synchronization problems? the servo motor I am ...
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114 views

What's the name of a robot manipulator construction with multiple thin arms joined together?

I am seeing on some videos robots picking items and putting them somewhere in order. Here are some examples: https://www.youtube.com/watch?v=wg8YYuLLoM0. https://youtu.be/ggFdvUlp8YU?t=38 How are ...
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0answers
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Cloth (non-rigid body) manipulation with computer vision? [closed]

I am currently working on a prototype device to automate cloth ironing task. So basically the mechanical design involves 4 manipulators and a separate manipulator arm with a hot pad (iron) to ...
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2answers
72 views

How to tilt a camera 180 using mirrors

How would you vertically tilt a camera 180 degrees using mirrors? I'm trying to add a pan/tilt mechanism to a Raspberry Pi's camera. The camera uses one of those flat cables with unstranded wires, ...
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4answers
344 views

Can you have a career in robotics if you hate mechanics? [closed]

I'm a first year electronics engineering student. I love almost all the aspects of robotics - the electronics, algorithms, control theory etc. I can't stand the mechanical aspect of robotics though. ...
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1answer
115 views

How has the Mars Exploration Rover (MER) has been working for 11 years if it was designed for 90 Sol? [closed]

The Mars Exploration Rover (MER) Opportunity landed on Mars on January 25, 2004. The rover was originally designed for a 90 Sol mission (a Sol, one Martian day, is slightly longer than an Earth day at ...
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71 views

Mechanism to oscillate a human leg?

I'm working on creating a robotic device capable of oscillating an adult human leg using the knee as pivot, being able to constrain the amplitude of oscillation by controlling the mechanism with a ...
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53 views

Automated high-precision weighing of individual parts

I'm trying to automate a process wherein individual small parts must be weighed one after another for identification / sorting. The parts would be fed to the scale using a conveyor. A mechanism is in ...
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1answer
59 views

Double/Triple inverted pendulum always on a cart?

All of the examples of keeping a double/triple inverted pendulum balanced using a PID controller I've seen seem to be on a cart. Like this one https://www.youtube.com/watch?v=cyN-CRNrb3E How come the ...
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3answers
38 views

Fastening sheet steel on nylon

I'm trying to attach a small piece of sheet steel (30mm x 50mm x 1mm) to a small piece of nylon (50mm x 50mm x 4mm). Does anyone know how they could be fastened using small screws ( Any thought ...
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1answer
533 views

Any books or web resources for robotics mechanical design? [closed]

I plan to build a mechanism with multiple axis, which is similar to a robot. To start, I need to define some specifications such as repeatable precision, speed, acceleration, and payload. Then the ...
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633 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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3answers
64 views

Is this supposed to be a bearing?

I'm looking at the assembly of a tail rotor that should look like this original image I wonder if the "tail output shaft stopper" (circled in red) is meant to be a bearing or just a piece of metal ...
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1answer
743 views

How modular arm joints work [closed]

Hello I'm trying to figure out how modular arm joints are designed and what kind of bearings/shafts are used for a modular-type robotic arm. Take "UR arm" for example. I believe those 'T-shaped pipes' ...
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96 views

Metal shaft design for a 6mm plastic bevel gear

I have a small POM bevel gear with these dimensions: It has a 6mm hole for the shaft and a M4 hole for the set screw. Suppose this bevel gear is meshed with a 45T bevel gear and give a max. output ...
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1answer
101 views

Attaching a M5 screw shaft to a cog wheel

Does anyone know of a good (low profile) way to attach the threaded (chamfered) end of a M5 screw shaft to a 30MM (30T 1M) plastic cog wheel? Would it be a good idea to widen the shaft hole and just ...
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1answer
49 views

How a 3d printer moves the header vertically in a MakerBot printer [closed]

I would like to know how the header in this MakerBot printer moves in the vertical up /down direction. Is there a detailed explanation of it including the parts involved?
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2answers
257 views

Is it possible to make DIY clone of MakerBeam [closed]

Is it possible to make clone of http://www.makerbeam.eu/ of some easy accessible material like: wood plywood OSB MDF HDF others Using any type of CNC machine to mill some holes and rails in those ...
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1answer
48 views

How to find center of a disk using robotic arm

Hello I am new to the field of robotics but have some knowledge of raspberry pi, arduino, python. I want to make Robotic arm which can be used to find the centre of any disk. There may be disk of ...
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3answers
637 views

How can this mobile robot rotate so perfectly?

Please have a look at this youtube video. When this mobile robot operates, the rack (which is said to weight up to 450 kg) can have its Center Of Mass (COM) distributed at any location. For example, ...
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1answer
42 views

Orienting rectangular plastic bricks [closed]

As part of a sorting machine, I need to orient a pile of plastic brick-shaped objects (which are all identical in size - about 3cm x 2cm x 1.5cm) so that they always end up with the white side facing ...
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1answer
85 views

POM gears and metal fittings

I'm looking at this setup: where the POM bevel gears are fitted with some kind of metal (bronze?) tube inside which fits over the shaft. What benefits does this method provide? Is it to allow the ...
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2answers
621 views

Comparison of lifting systems

What kind of systems can be used to make a torso lifting system like the one used by this robot (the black part) : Rack and pinion lead screw scissor lift can a triple tree help ? What are the pro ...
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1answer
5k views

How does a two-gear pull-back car toy work?

This is not a robotics question, but this Stack Exchange is the closest I could find to mechanical engineering. Please refer me to a better place to ask this, if one exists. Hopefully someone might ...
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41 views

Is Venetian mirror possible in Autodesk Inventor? [closed]

I see there are things like glass and mirror in Autodesk Inventor Professional 2016 but is there a possibility to have Venetian mirror? So that from one side it would look like a mirror and from the ...
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1answer
81 views

Software to simulate mechanics of production line

Is there any software where I can simulate production line elements (joints, motors, springs, actuators, movement)? For example I want to simulate mechanism to unwind paper from big roll to weld it ...
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425 views

Recommendation for 3D mechanism modeling and simulation software

I'm working on a robotic hand and I would like to simulate different joints and tendon insertion points before starting to actually build it. I've been googling and found things like Solidworks and ...
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2answers
1k views

Lifting robotic leg with only one servo

Note before I start: I have not actually put anything together yet, i'm still just planning, so any changes that require a shape change or anything like that are accepted. I'm working on making a ...
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2answers
242 views

What are hardware components to build a modular robot which consists of several 5x5x5cm modules? [closed]

I am computer science student and I have no knowledge on robotics. In my project, I am trying to find controllers for modular robots to make them do specific tasks using evolutionary techniques. For ...
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1answer
1k views

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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51 views

Wires or columns which contract on passing electricity

Background: Introductory robotics competition for college freshmen; Bot has to open 8 jars (with two balls in each of them) in ten minutes and load the balls into a shooting mechanism. So, we were ...
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76 views

Book on mechanisms [closed]

I wanted to know if there is any sort of archive of mechanisms that contains a brief description of mechanisms like there type of motion and forces involved. Not lengthy derivations and other stuff.
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208 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....
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135 views

What is the achievable stiffness of a impedance/admittance controlled robot (incl. haptic devices), given its structural and control stiffnesses?

EDIT: I realised I missed the point of the paper completely (thanks to very-skim reading ;) ). So, this part of it I'm relating to is about how much damping - not how much stiffness - should we ...
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1answer
40 views

How can a memory alloy be used as an alternative to a compressor found in a refrigerator? [closed]

I'm curious about this alloy and how they say it can be used as an alternative to a traditional compressor. Can anyone explain how this would work? My goal is to understand that use case so I can ...
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177 views

Education sources for robot building?

I teach FTC robotics to high school students, and while I'm a proficient programmer and can teach them coding fairly well, my mechanical skills are a bit soft. I'm looking for good sources for myself ...
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2answers
229 views

Beginner question about software for calculations

I'm a complete beginner in robotics with background in programming... I started thinking about a robot project yesterday and want to order some motors to test with. I saw the specs for the motors, ...
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1answer
49 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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2k 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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190 views

Reverse lift mechanism

I have made a RC robot from a wheelchair and I'm planning to attach a snow plow. I'm wondering if there is any mechanism that would be able to lift the plow when reversing. I have only 2 channel ...
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Unilateral Torque Constraint on the foot-ground interface

I was studying the basics of legged locomotion and came across the unilateral force and torque constraints at the foot-ground interface. I understood the implication of the unilateral constraint on ...
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1answer
410 views

Iron man Jarvis like robot

I'm very passionate about robots from my childhood.I'm a java developer. I love sci-fi movies.I have a little bit knowledge in embedded systems and electronics. My ambition is to build a robot like ...
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50 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 ...
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1answer
1k views

How does Fliike Smiirl counter mechanism work

First of all please see this video : http://www.youtube.com/watch?v=n0dkn4ZIQVg I think there is ony one stepper motor -or servo- working in the mechanisim. But as you can see each flip counter works ...
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4answers
1k views

Fuses for mechanical systems

** If there's a better stack exchange site for this, let me know--the mechanical engineering one is closed so I'm not sure where else is appropriate ** Do mechanical systems have fuses? In an ...
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2answers
64 views

Robotics advice needed

For a high school project I will be building a robot that will draw an image on a whiteboard for you based on what instructions you give. To accomplish this a motor will move the pen on each axis ...
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762 views

SCARA Arm Lead Screw Choices

I'm thinking about building a SCARA Arm to lift moderate loads(5lbs) with a high degree of accuracy. I want a relatively quick and inexpensive Z axis gantry, and I was thinking about using a lead ...
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2answers
99 views

Device to roll a mat

I'm looking for some direction on how to create a device that does the following: Imagine you have a yoga mat, I want a device that can roll it up and unroll it without a human intervening in the ...
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1answer
2k views

Trying to design a mechanical system with vertical and horizontal movement

I'm trying to devise a system to lift a 10kg weight a distance of 1.4m vertically, and allow it to move in/out a distance of 30cm. I'd like the motions to be able to occur simultaneously if possible. ...