# 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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### 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 ...
48 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 ...
187 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 ...
1 vote
247 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, ...
1 vote
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### 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 ...
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 ...
202 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 ...
1 vote
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 ...
443 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 ...
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 ...
1 vote
2k 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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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 ...
876 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 ...
102 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 ...
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. ...
653 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 ...
1 vote
123 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 ...
69 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 ...
170 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 ...
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 ...
720 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 ...
1 vote
44 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 ...
96 views

### What to use as electrovalve?

I want do make following installation (blowing bottle tops as music instrument): ...
2k views

### Building a non rotating persistence of vision device

I'm looking for a way to create a non-rotating persistence of vision device. I have all the electronics set up but I'm stumped with the mechanical design. I tried these two designs: But these didn't ...
6k views

### What motor to use for reciprocating (reversive) movement [closed]

I want to make a copy of this machine Fisher Price Soothing Motions™ Glider and I'm wondering what motor to use? Simple DC motor with appropriate gearbox (slow rpm) or stepper motor? Here is another ...
495 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: ...
129 views

### Once you understand motors, what's the next step? [closed]

I've gone through tutorials on how to build circuits and control dc, stepper, and servo motors. I may not understand everything about them internally, but i have a good basic foundation. Now i'm ...
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### Lawn mower robot (type of cutter)

If not all, but major types of lawn mower robots are rotary mowers. I presume1 that reel mower is more efficient, and is said to leave a better lawn health and cut. So, why industry go to the other ...
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 ...
4k views

### How to measure and dispense a finite amount of powder or liquid

I've been watching too much How It's Made, and I've been wondering how they build devices that spray/inject/dispense a finite amount of liquid (to within some amount of error). I wanted to try this ...
170 views

### Plastic shaft supports

I would like to prevent a shaft from being pulled through it's bearings - that is, press a plastic ring around it on either side. What are these rings called? They're not bearings or hubs. And where ...
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