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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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16 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 ...
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1answer
33 views

Can somebody explain how these forward kinematics matrix equations were formulaed?

Here's the link to the entire answer: Designing a 5 bar linkage robot: Plot Clock
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1answer
49 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 ...
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1answer
37 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
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21 views

2D/ 3D moving joint

I am trying to design a test rig that will mimic the motion of walking. At the moment I am going to be creating the movement in the vertical and the side-to-side motion. I will control the amount of ...
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0answers
12 views

Dimensions of an X Quadcopter frame

I'm writing a paper on the calculations required to design of an X frame Quad copter for any particular load.There isn't a lot of material available to guide me through what actually needs to be ...
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1answer
62 views

How to turn direction of 4 planar wheels into up/down motion?

For the head in a 2D plotter I have 4 gears in an X configuration in the same plane. The gears are driven by belts from the outside in different combinations. The top and bottom gear can be turned in ...
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1answer
32 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
26 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 "...
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12 views

How to use Matlab to to simulate the response of the system subjected to a harmonic load of F1

I recently became interested in Dynamics and I am trying to use MATLAB to simulate the response of a dynamics system when subjected to so a force that varies with time. The reason for this is to have ...
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1answer
44 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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1answer
58 views

I need help figuring out what motor is used in this design

I am learning how to make rigs for high speed motion control. Basically, whatever action needs to be executed must be done by a rig that is triggered at an exact moment. In this particular case, I ...
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1answer
128 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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2answers
422 views

Different methods to determine DOF: Chebychev-Kutzbach-Grubler method vs. Screw method

I'm familiar with Chebychev-Kutzbach-Grubler method to determine degree of freedom of a robot arm. But it seems this method fails to calculate the mobility of some parallel robots, as explained here. ...
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1answer
63 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
84 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
59 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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1answer
75 views

How to seal a threaded rod so I won't lose oil?

I have an M5 threaded rod that penetrates a box. Outside it is driven by a motor and it rotates a part inside the box. The box is sealed and I would like to seal the area around the rod as well. I ...
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1answer
112 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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0answers
59 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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0answers
32 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
42 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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1answer
47 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
37 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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2answers
251 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
131 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
58 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
65 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
443 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
48 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
41 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
395 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
41 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
65 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 ...
4
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1answer
76 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
470 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
37 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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0answers
294 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
802 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
200 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
60 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, ...
2
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1answer
547 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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2answers
47 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
67 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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108 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
39 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 ...
6
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3answers
160 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
200 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
29 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
343 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 ...