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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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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
66 views

Choose the structure of the dynamic model for the generalized equations of motion of the robot

I ask the robotics specialists for help as I am a little confused. I have two subsystems which are shown in the picture below: One of them is a system of stable and controlled differential equations ...
ayr's user avatar
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Jacobian for transformation of rotation angles

It is known that with the help of the Jacobi matrix it is possible to transform the angular velocities of the drive links $\boldsymbol{\omega}$ into the angular velocity of the platform $\boldsymbol{\...
ayr's user avatar
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What is the most accurate method to calculate Torque of 5 DOF Robotic arm

I am working for development of a 5 DOF Robotic arm , and I am confused in the Torque calculation This is a 5 Axis revolute Joints Robotic arm , where Motor for 1st axis will rotate the turning table ...
Muzammil Ibrahim's user avatar
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71 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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Why are the angular velocities of concentrated masses in Lagrangian independent?

There is an ordinary linear three-mass system. If we write its Lagrangian, we get the following equation. where $W_k$ and $W_n$ - kinetic and potential energy. To find the moment of rotation of the ...
ayr's user avatar
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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
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473 views

Rotating two things on the same axis

I'm working on a project where I want two separate shafts to be in the same place. Think of it like a clock where the hour and minute hands move independently. Also like a clock, I want the motors and ...
hjfreyer's user avatar
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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 ...
John M.'s user avatar
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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 ...
Defozo's user avatar
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2 answers
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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, ...
Cerin's user avatar
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2 answers
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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 ...
An Orphan's user avatar
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1 answer
219 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....
Alex Pelletier's user avatar
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2 answers
105 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 ...
user2708543's user avatar
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How to choose drives for a 6Dof manipulator with a shperical wrist

So my question I guess is tied to design or modelling(Not too sure what topic it falls under) a manipulator according to what I read in the book "Introduction to robotics:mechanics and control&...
Njo_nds's user avatar
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Screw theory for kinematics/dynamics of mechanisms

Is screw theory commonly used for general kinematics/dynamics of mechanisms (not just robotics)? I'd be interested in anything that covers the types of mechanisms you would find in a typical ...
Molecular Lionel's user avatar
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How to find coefficient of friction that will maximize torque?

When using DC motors with a drive wheel (aka "direct drive") to propel a vehicle (e.g. an RC car), force and torque play a role in how efficiently that motor's power is transferred into ...
tniles's user avatar
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Why in forward bending knee orientation in quadruped legged robot require less torque in knee joint?

I'm trying to find answer in terms of physics explanation, why knee joint torque requirement is less in the forward bending leg orientation of a quadruped legged robot. I'm referring this article, in ...
Dibyasankha Kundu's user avatar
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25 views

Communication error

My Robot arm and controller battery got ablated it showed H1600 mechanism error.. did ram reset of the controller but controller not seeing robot arm. it is RV-2FB-D1-SM15 Robot arm and CR750 D ...
muhammad aminu's user avatar
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0 answers
71 views

Spherical Parallel Manipulator Lagrangian problem

I faced a very serious problem and I urgently need the help of specialists in robotics, mechanics, physics and mathematics. I am trying to derive equations of motion from the Lagrangian of a spherical ...
ayr's user avatar
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Why isn’t my shaft moving? [duplicate]

When I put my shaft through the vehicle body (small robot) and have the motor attached to it through two rotating gears, the shaft isn’t rotating? I think it’s due to how the hole diameter is the same ...
Ralph Faure's user avatar
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1 answer
285 views

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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0 answers
44 views

How to create a jumping mechanism for a small robotic car?

I have to create a jumping mechanism for a small robotic car and was thinking about using a spring mechanism to do so. However, due to dimensions (16cmx8cm) and mass constraints (below 200g) I cannot ...
Alexandre Berkovic's user avatar
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50 views

What sort of robot would one use to tie precise knots in a string?

I need many knots tied repetitively and consistently in a string. I have been trying to make something which ties knots for me in a consistent manner. I've got a project which requires a few hundred ...
tuskiomi's user avatar
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How to make small quantities of gears

For a hobby project, I'm designing a clock with a single hand that makes one revolution per year. Using really helpful sites like https://geargenerator.com/, I have the gear ratios and dimensions ...
Ken Williams's user avatar
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1 answer
1k views

Selection of motor and Calculating the torque for 6DOF robot Arm

I am trying to select the motor for a robot arm with six degrees of the freedom robot arm. What should I do to select the motors and which type of motor I should select?
Muhammad Khird Added's user avatar
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1 answer
79 views

What should i do to rebuild robot salto from Berkeley uni as a mechanical engineering undergrad?

What are the main components of robot salto? What are the necessary skills and knowledges to reproduce it? Also as you can see, i am a mecheng and i want to reproduce this robot as finishing project ...
user31416's user avatar
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1 answer
38 views

Pnumatic sulinoid with multiple outputs

I can't figure out what solenoid I would use. Everything I search for comes up with cylinders. Not sure if it's even a sulinoid that I need. I'd like to have 8 hoses connected to a compressor. I'd ...
SolidCloudinc's user avatar
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1 answer
161 views

DC geared motors or leadscrew and motor for joints

I'm trying to build a quadruped robot. I studied dynamics and to get an idea, I read and watched papers and videos related to robots like ALof and StarlETH and some more. But since this is my first ...
KalanaRatnayake's user avatar
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1 answer
36 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
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1 answer
447 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 ...
Satheesh Kumar's user avatar
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1 answer
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. ...
johngiowa's user avatar
-1 votes
1 answer
63 views

How to transfer motion between these two parts?

I'm trying to model this arm and I'm having a problem knowing what way could I use to make the red part always parallel to the surface of the table
Abeer's user avatar
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-1 votes
1 answer
51 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?
sohaib shaikh's user avatar
-2 votes
1 answer
86 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.
Adnan's user avatar
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