Questions tagged [actuator]

A motor, not necessarily electric, which converts energy into some kind of motion.

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29
votes
5answers
57k views

Which type of actuator will be suitable for a very strong robot arm?

I wish to build a robotic arm that can lift a useful amount of weight (such as 3-6 kg on an arm that can extend to approx 1.25 meters). What actuators are available to accomplish this? The main ...
25
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5answers
6k views

How can I integrate a smart phone with my robotics project? [closed]

Smart phones these days typically come with a gyroscope, accelerometer, compass, camera, and GPS sensor all on board. They also usually have a connection to the internet with Wifi and mobile data ...
13
votes
2answers
4k views

Creating a fast, uniform, linear actuator

Most of the linear actuators I've seen are nonuniform and/or slow. Those using a cam or crankshaft-like mechanism (and nearly anything hydraulic/pneumatic) cannot be moved at a constant speed without ...
12
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3answers
926 views

What determines the amount of noise an actuator produces?

Many robots and other mechanical devices produce the signature whirring noise as they move, some produce less. What makes the difference? What restrictions a silence requirement places on a robot?
9
votes
2answers
418 views

Adding an Actuator or Force to a (Featherstone) Articulated Rigid Body Model

I'm working on a project where I need to model a system that is essentially comprised of a series of ball-and-socket joints attached to a base, which is attached in turn to a prismatic joint (rail). ...
9
votes
1answer
205 views

How do I decide the size of the time steps between sensing and control actuation?

My Background: My experience is in solid mechanics and FEA. So I have zero experience in robotics/controls. Problem Description I'm developing a control strategy to stabilize a complicated 6-...
7
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3answers
2k views

How to open a sliding window?

I live in an apartment that has sliding windows in it. The apartment is naturally warm because we live above a mechanical room, such that we either opened the windows or ran the air conditioning ...
6
votes
2answers
239 views

Is there a rule of thumb for actuator torque overhead?

When installing a servo or other actuator, I measure the force needed to perform whatever action is needed and find an actuator that can generate more than the necessary force. However, I recently ...
5
votes
5answers
2k views

Electronic circuit for heating nylon fishing line muscle

I'm trying to make artificial muscles using nylon fishing lines (see http://io9.com/scientists-just-created-some-of-the-most-powerful-muscl-1526957560 and http://writerofminds.blogspot.com.ar/2014/03/...
5
votes
4answers
2k views

Pushing Buttons Remotely over Ethernet

So I want to program something that will simply push a button, but controllable over ethernet. I'm new to robotics so I don't know where to start. What's the best way to control an actuator over a ...
5
votes
1answer
135 views

Actuator design. plausible?

So i got this idea waay back when i was in highschool as a kind of electromagnetic analogue to a biological muscle. it is basically a long stack of thin electromagnets connected in parallel. . when ...
4
votes
3answers
843 views

What types of actuators do these industrial bots use?

I have a particular example robot that interests me: http://www.scmp.com/tech/innovation/article/1829834/foxconns-foxbot-army-close-hitting-chinese-market-track-meet-30-cent See first image, the ...
4
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2answers
164 views

looking for a miniature joystick, but in reverse

Does anyone know if small mechanical actuators exist which can be controlled electrically, sort of like a miniature joystick, but in reverse. Instead of it picking up mechanical movement and ...
4
votes
1answer
2k views

Why do series elastic actuators have more accurate and stable force control?

The other day, somebody was telling me about a robot in their lab, and they mentioned that it has "series elastic" actuators. But after doing a bit of Googling, I'm still not sure as to what this ...
4
votes
2answers
70 views

How do I dispense a greasy fluid?

I'm a agricultural engineering student and complete newbie trying to build a simple mechanism attached to a drone that dispenses a grease-type fluid. However, since I'm not familiar with the field, I'...
3
votes
3answers
134 views

What actuator types exist that remain locked in their last position like hydraulic piston?

I would like to find an electronic actuator that mimics the characteristics of a hydraulic actuator, in that the position remains fixed without power drain when the actuator is not moving. Which ...
3
votes
1answer
370 views

How can a coaxial stepper motor be used to drive the Z axis effector of a SCARA robot?

I am new to robotics and mechanical engineering. I am trying to understand how the Z-axis (and effector) of a SCARA robot can be driven by a stepper motor with it's shaft coaxially aligned along the ...
2
votes
1answer
4k views

Design and construction of universal robotic arm (5kg, 1m)

i am working on my master's thesis about design and construction of universal robotic arm. Goal of my work is to design 5 DOF robotic arm. Something like on the picture: I need it to be able to ...
2
votes
2answers
374 views

Actuator to control steam valve

I have a steam radiator at home and it has a valve similar to the picture below. Please note that the valve doesn't have grooves on top to attach things to. I want to build something to turn it on ...
2
votes
1answer
202 views

Tiny high torque actuator/sensor design

I need to assemble a small (about 8cm x 5cm x 5cm maximum), actuator with as much torque as I can get at that size. It will be driving a small reel and pulley (reel is ~1.25cm^3, 5mm center diameter), ...
2
votes
2answers
332 views

2Nm small motor

Currently designing a spherical wrist, I want to manipulate a 300gr payload. the design has a 200mm span, so I'm guessing at a 1.1Nm (considering the weight of structure & motors). I've looked at ...
2
votes
1answer
177 views

Linear actuators in a cartesian robots

I would like to make a Cartesian robot with maximum speed of up to $1ms^{-1}$ in x/y plane, acceleration $2ms^{-2}$ and accuracy at least 0.1mm. Expected loads: 3kg on Y axis, 4kg on X axis. Expected ...
2
votes
1answer
725 views

Spring with electronically adjustable stiffness

I would like to build a mechanical module that acts like a spring with electronically controllable stiffness (spring rate). For instance, let's imagine a solid, metallic cube, 0.5 m each side. On the ...
2
votes
1answer
63 views

What is an “actuation state”

The paper A Feedforward Control Approach to the Local Navigation Problem for Autonomous Vehicles by Alonzo Kelly uses the term actuation space. Feedforward solves the historically significant ...
2
votes
2answers
112 views

How to make door opening to the top

I need to make this construction (door is closed by default, door is opened to the top). This is the scheme: Red rectangle on the picture is the aperture, blue rectangle is the door (weight is about ...
2
votes
2answers
1k views

Calculate required motor torque through Harmonic Drive

I have a term project which is controlling a two-link manipulator with harmonic drive installed at each joint. To control, i used Computed control method to determine the torque needed for each joints ...
2
votes
2answers
723 views

What kind of torque is needed for a small 5-6 axis robotic arm?

I'm new to robotics and I'm looking to make a 5-6 axis robotic arm out of stepper motors but I honestly don't know how much torque I should have for each part. Below I have described in more detail ...
2
votes
1answer
270 views

Repairing non-lubricated linear actuator

I have a Chinese CNC mill (CNC3020T, though several different devices go under this name), and its Z axis was very imprecise, often being randomly off position by as much as 0.5mm. I've disassembled ...
2
votes
2answers
63 views

Choosing motor type for high reliability for many cycles

I am designing a multi modal stent testing machine which will bend, twist, and compress stents (very thin, light, and fragile cylindrical meshes for in arteries) in a tube. The machine will operate at ...
1
vote
3answers
660 views

Can't Read current on Pololu Dual MC33926 Motor Driver Shield for Arduino

I purchased a Pololu Dual MC33926 Motor Driver Shield for Arduino, and for some reason I cannot read current from the motor controller. On the Serial.println() it just prints weird data (garbage), and ...
1
vote
2answers
329 views

Stewart platform as robotic wrist joint

I'm planning the design of a wrist for a humanoid robot. I would like to choose a design that is sturdy while allowing for dexterity comparable to a human wrist. One option that was presented to me ...
1
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2answers
431 views

Vacuum Lifter: Moving Playing Cards

I'd like to buy a small Vacuum Lifter so that I can move playing cards around with robotics. But my "google-fu" is failing me. I don't really know what search terms to look for... or what webpages to ...
1
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2answers
737 views

Building industrial-like robotic arm

I would like to build a 70cm articulated robotic arm (not a scara one) that can lift between 10kg and 15kg (10kg would be awesome already, this payload includes the weight of the arm+gripper) and ...
1
vote
1answer
204 views

Does MIT Cheetah uses Series Elastic Actuator?

I have been wondering does MIT cheetah purely only use electrical active compliance on it's robot or did they use a Series elastic actuator since they have this webbing tendon?
1
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2answers
152 views

Rotary Serial Elastic Actuator

I'm building a 7oF arm with series elastic compliant joints. I need series elasticity because I'm training the robot to do autonomous manipulation using machine learning, and I want force control (and ...
1
vote
2answers
130 views

How can I turn a bowl/glass upside down?

I want to dispense water/cut-vegetables from a glass/bowl(240 ml) by turning it upside down. The screencast shows the idea: I can directly mount the clamp on a servo motor, but I think that will be a ...
1
vote
1answer
93 views

How can i make a compact soft robot

I want to make a compact (actuators motors and sensors are all in one) soft robot. Actuators can be pneumatic or dielectric. I need suggestions about manufacturating. I'm open to new ideas.
1
vote
1answer
28 views

How to balance a long vertical bar

I have a mobile base (1400x1800x400 mm) which has a vertical bar (1) mounted on its geometric center; this vertical bar has a length of 2500 mm and a diameter of 100 mm and I need to keep it always in ...
1
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1answer
78 views

Replace screws with motors!

I am new to this space and the field. Please pardon my lack of intuition or knowledge. I have a recording stand with a join in between. a pair of screws through which the whole apparatus pivots like a ...
1
vote
1answer
384 views

Rostock Delta Robot 3D Printer Degrees of Freedom (DOF)

What is the degrees of freedom (DOF) of the Rostock delta robot 3d printer (delta mechanism that consists of three prismatic joints)? Here's the link to the delta mechanism I'm referring to: https://...
1
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1answer
457 views

Converting a linear acceleration command into a DC motor command?

I'm constructing a 2 wheels balancing robot which uses a PID controller. I've tuned my parameters on numerical simulations based on a continuous inverted pendulum system so that the simulated ...
1
vote
1answer
168 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, ...
1
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1answer
24 views

Suggestions for a rotational actuator [closed]

I am looking for a rotational actuator with high torque and one whose rotation angle can be controlled using the arduino control signals The project is an e-brake for an e-bike. Working mechanism ...
1
vote
1answer
395 views

Telescoping linear actuator [closed]

I need to find a linear actuator that can extend to multiple times it's length. I am going to be fixing the actuator horizontally and it will carry a light vertical load. So far I have thought of ...
1
vote
1answer
33 views

Exchange air and maintain thermal insulation

My application is composting with worms outdoors inside an a styrofoam cooler. I use a heat lamp and a thermo-electric cooler to maintain the temperature in the bin when the temperature outside is ...
1
vote
1answer
219 views

Two State Linear Actuator

I need two state linear actuator. You can have a look at the picture to understand what I mean. Don't care about the hand ! (source: robaid.com) I need to electrically move the things like this ...
1
vote
0answers
85 views

McKibben artificial muscles and the 400:1 ratio

I was recently reading that those artificial muscles had the highest power/weight ratio while electric motors only have a ratio of less than 100:1. As electrical engineer I have never worked with ...
1
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0answers
20 views

Find the right actuator to control the flow of flour [duplicate]

I'm building a circuit to control the flow of flour. The basic idea is to open that actuator (Possibly valve?) to let a specific amount go through and then close it. The tube should have a diameter of ...
0
votes
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 ...
0
votes
2answers
32 views

What is the typical intro example for control systems for a spherical joint?

I have been studying Acrobot and Cart-Pole. Both of these systems I can both work out the equations of motion and linear manipulator equations for how to maintain the poles vertically. The problem ...