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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28 views

Motorised steering without shock absorber?

I was looking up on the Curiosity Mars Rover and noticed that the steering appears to be driven by a (geared) stepper: I presume the drive contains a worm gear to reduce power consumption of the ...
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1answer
103 views

Rotating a lever with a small servo

I'm trying to rotate a lever link to gently "offload" a load using a servo. Here's a drawing: Here, the red is a lever, yellow pivot and black is the load. To offload, the lever needs to be turned 90 ...
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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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1answer
250 views

How do I achieve this? Grid of dowels powered by piston-like movement

I am completely new to this site and robotics, but I have experience in programming, and programming microcontrollers. I would like to create a grid of "pixels", where each "pixel" is a metal or ...
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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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0answers
33 views

What should be my spray handle-servo interface for pull mechanism? [closed]

I am an electronics engineering student who recently started working on Arduino. As part of my efforts to wake up on time, I decided that I should make an automatic water spray alarm clock. I have all ...
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27 views

How to use thrust bearing with shaft?

I know how to use radial bearings, e.g. ball bearings with shaft. But no matter how much I googled I didn't find any proper clear way to use thrust/axial bearing with shaft. I downloaded the thrust ...
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1answer
191 views

Controlling Actuated Robot Hand in Underactuated Manner

We have an allegro hand in our robot, and it is in actuated behavior. In other words, each joint is controlled one or more than one actuator, that is motor. There are 3 actuators for each finger, ...
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1answer
136 views

Linear actuator for impact tests [closed]

I'm puzzling over the remake of an impact testing machine. It's a sort of a robot arm that pushes a probe against a target to test its characteristics. Right now the machine use air pistons, because ...
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77 views

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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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
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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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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31 views

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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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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436 views

Advice on mounting a servo for a nerf sentry gun

I am trying to make a nerf sentry gun to shoot my co workers. I am building it more or less from scratch and have come to the part where I need to come up with plans to assemble it. I am looking for ...
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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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37 views

Actuation of three reciprocating blades via conversion of rotary to linear

Sorry if this is out of robotics, but this seemed the closest. A motor has to be used to rotate three cranks. They are in the same plane, but each should not run at the same time. Only one that ...
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2answers
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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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
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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2answers
630 views

Simplest and cheapest way to create a spring back latch

My and a friend are hacking together a Nespresso Coffee pod dispenser. We have our heart set on a particular design after thinking up countless ways of dispensing a single pod. The design has a ...
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2answers
5k views

How to build a liquid filling machine using piston? [closed]

My team developed a filling machine for liquids which uses a piston to measure and deliver volumes 0.1 to 1 liters into bottles. It is built mostly with mechanical parts and we'd like to replace most ...
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2answers
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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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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1answer
3k views

Ideas for shooting the ball in a soccer robot [closed]

What is the best option to use for the shooting system of a soccer robot? I have already implemented a solenoid-based system for shooting and it works perfectly. However, I'd like some other methods ...
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1answer
93 views

Wall-E Legs mechanism

I was trying to understand the mechanism of Wall-E's Legs from the Wall-E 3D animation movie of Pixar Animation Studios, how he is able to move up and down and move the tracks on all directions. Can ...
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1answer
92 views

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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1answer
216 views

What is the front mechanism of this robot's track called?

What is the mechanism on the front of the tracks of this robot called? They are also tracks, but they are able to be moved by the operator, and they are able to function as tracks. I've only seen ...
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1answer
33 views

Sliding system basic question

I have a basic question. Imagine a plate, with a hole drilled in each corner. Imagine 4 shafts in these 4 holes,attached to another plate. Intuition tells me that it would take considerable effort ...
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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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2answers
369 views

What is the correct name for “servo brackets”?

I refer to these types of brackets as servo brackets, or robot brackets: I know that the two specific brackets, shown above, are known as a short-U (some vendors refer to them as "C", en lieu of "U") ...
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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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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
51 views

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 ...
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1answer
34 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 ...
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1answer
63 views

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 ...
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1answer
35 views

Design a robot that can apply hot glue to paper

I need to automate a process that involves applying hot glue to paper. I own a standard handheld hot glue gun, like this one: Sticks of room-temperature glue are fed in the right side. Pulling the ...
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1answer
19 views

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 ...
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1answer
71 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 ...
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1answer
88 views

I need the scheme of Irobot creator 2 [closed]

I've tried to drill a number of holes in Irobot. I've missed one of them and I need the electronic scheme of Irobot-Creator 2 for trying to restore this input of the data cable. Can you help me with ...
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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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1answer
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
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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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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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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1answer
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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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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0answers
23 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 ...