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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2answers
367 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
525 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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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
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
738 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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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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1answer
47 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
631 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
84 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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1answer
99 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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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
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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422 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
240 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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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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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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50 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
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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0answers
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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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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
227 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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0answers
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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1answer
409 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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0answers
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
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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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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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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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
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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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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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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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. ...
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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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0answers
433 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
4k views

12V compressor and air pressure control

I am trying to make a simple robot with few functionality for someone, one of these functionality is inflating a balloon inside the robot, I know how to control a compressor using Arduino but the ...
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1answer
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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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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1answer
116 views

Mechanism to oscillate a needle like object in vertical motion

I need to pop out a needle like object(toothpick,matchstick,etc) from a hole in a surface and push it back in automatically.I need to make a array of such needles in which each needle's position can ...
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2answers
97 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
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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1answer
66 views

Is this gear design feasible?

I came up with an idea and am working with a mechanical engineer to design and prototype the idea but I keep sketching out my own ideas in the process and I just came up with this.. I'm quite sure ...
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0answers
1k views

How to connect a servo motor and a crank shaft

I have a standard 5v I am using the horn it came with it, I mean this piece: Like the long arm in the middle. Each of its holes are 1mm diameter. Then I have a 3d printed crankshaft I did: Its ...
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2answers
674 views

Industrial Robotic Arm

I had the opportunity to work for a factory/company that is in the domain space of production and they want to use a robotic arm for part of the production line. They want basically a robotic arm ...
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0answers
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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1answer
93 views

What to use as electrovalve?

I want do make following installation (blowing bottle tops as music instrument): ...
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4answers
157 views

Why linkage-based haptic devices are much more common than cable (tension)-based ones?

According not only to this link, but in my humble opinion to common sense as well, cable-based haptic devices have got lower inertia and are less complicated mechanically. I also believe that ...
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2answers
118 views

What is the Name of the part I'm describing

I'm looking for a part that will do a particular function. It has to be able to move along one axis and tell me the force that is being exerted on it. Kind of how like a piston moves inside an ...