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Questions tagged [robotic-arm]

A robotic arm is a type of mechanical arm, usually programmable, with similar functions to a human arm; the arm may be the sum total of the mechanism or may be part of a more complex robot.

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Robot Arm with vacuum gripper

For my thesis beginning in 3 months, I am lookking for a robot arm with a vacuum gripper. I want to build an automated test station as a prototype. I am really new to robotics and wanted to ask if ...
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1answer
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Humanoid robot with Raspberry pi [closed]

I am in the midst of designing a humanoid robot, and I am very new at this technical stuff, but I have found servo motors which are capable of producing 500 kg.cm. Now I am looking at making a ...
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My robotic arm keeps falling down after it turns to a certain angle or above

As the title says, the arm keeps falling down rather than being stuck at the position it was set to be at because of the gravity pulling it down. Im using Raspberry Pi for this, some MG996R servos and ...
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1answer
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Defining C-space state for an arm in OMPL

I'm very new to Robotics, so please bear with my ignorance about the subject. That said, I'm trying to use Open Motion Planning Library (OMPL) to set up the configuration space for a robotic arm ...
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2answers
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how to control servo motor with potentiometer in arduino

I'm working on a robotic arm which uses 3x MG995 servo motors, 3x potentiometers (10k), and 1 Arduino Uno. I uploaded the code to the Arduino but the servo won't stop. I want to control it with the ...
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URScript - how to get the actual TCP pose in tool space coordinate system?

I am writing a simple script for universal robots UR10 robotic arm. I am trying to find a way to to see if the tool current position is outside of a 3D bounding box. the 3D bounding box is defined ...
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2answers
101 views

How do I find the inverse kinematics of a 5-DOF manipulator having the following DH parameters?

alpha = [ -90, 0, 0, 90, 0] a = [ 0, 400, 200, 0, 0] d = [63.5, 0, 0, 90, 100] I am trying to calculate the joint angles but I am stuck ...
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Tracking object in realtime using depth image stream from a RGBD camera

I have an Intel RealSense camera which can stream RGB and depth image. Using those information I want to track an object moving on a table top. More specifically, I want to know position $(x,y)$ and ...
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1answer
22 views

Controlling YuMi robot by serial port

I'm trying to control the YuMi robot arm by a serial port. The serial port will give the information on what direction the end-effector should move and what is the velocity. What I would like to ...
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1answer
30 views

Trajectory following- What if the robot joint motor are not able to keep up with the generated trajectory?

I want my robot manipulator to follow a user-defined path. Based on the waypoints given as input and the velocity and acceleration limits of the joint motors, I generate a trajectory. At every time ...
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1answer
38 views

Does the red object act as a fulcrum (as explained bellow) to make picking up easier?

In picture one I have shown a robot arm (green) rotating to pick up a box, using a fulcrum (red). The arm after rotating is shown with black rectangle. The vertical arm on the left is attached to the ...
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1answer
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Maximum value of norm of mass matrix M

How do I compute the maximum values for ||M(q)|| and ||M_dot(q)||, the induced 2-norms, where M(q) is the mass matrix from the standard dynamical model of a robotic manipulator. I have the numerical ...
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1answer
52 views

Path planning of wheeled robot [duplicate]

let's say the robot Looks like this (an usual robot arm with 4 wheels) : In this case as far as I know, the idea of path planning is just to compare the actual position x with the desired position ...
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1answer
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Pwm settings of a Sg90 servo motor

I use a TowerPro sg90. 1.5 ms for the centre position 0 degree, and 2 ms pulse for +90 degree and -90 degree with a 1ms pulse. But it's definitely not looking like it goes for 90 degree or -90 ...
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2answers
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Struggling to understand Jacobian Inverse Kinematics

I'm trying to find a method to control a moveo 5dof arm. My goal is to calculate the right angle to turn for each stepper motor to reach a desired point in real environment. I've spent time looking at ...
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Torque Disturbance Observer for Manipulator Arms

Is there a tutorial/guide apart from the research papers ( paper 1 and paper 2 ), for implementation of torque disturbance observers on multi-DOF robotic manipulators to determine sudden collision ...
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How to implement end effector orientation in generic IK solver

I am trying to script a basic, lightweight IK solver with a Jacobian Transpose method. I have gotten a basic script that reach the desired position very quickly. What I am not able to do is achieve a ...
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2answers
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Jacobian of a 6DOF arm

I have a robot with 6 DOF. I read a lot of tutorial on how to compute the Jacobian, but usually all examples are for planar robots with 2DOF. I don't understand how can I get the Jacobian of a 6 DOF ...
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1answer
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What is the rectangular-shaped joint in this diagram?

What is the rectangular-shaped joint under the M1? What does it do, and what is its DOF?
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1answer
37 views

3 arm robotic claw

I am attempting to design a 3 prong robotic claw for a robotic arm I am working on. I am planning to use sg90 servo motors, but I can't get my current design to work. My current layout is to use one ...
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1answer
43 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
37 views

Robotic Arm Senior Capstone. Electronics/Controls/Sensors Questions

I am a mechanical engineering student currently working on my senior capstone. My team of all MechEs has to build a robotic "arm" where the arm is really just a link/bar of aluminum. The thing we ...
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2answers
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Inverse Kinematics - How to only find a unique joint angle solution in 4 dof robot?

I have to develop an algorithm to determine the necessary joint angles to achieve a desired TCP position and orientation in a 4 joint manipulator. I have come across a concept called "degeneracies", ...
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3answers
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Polylactic acid - Can I drill into it?

For a school project, I'm creating a mechanical arm and I'm thinking about using a 3D printer to create some of the pieces. Obviously, This arm is dynamic, so I wanted to make the pieces as light as ...
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Understanding the kinetic energy expressions for a 1 link vs 2 link robot arm

I'm studying these lecture notes on dynamic models of robot arm links, slides 33-36, where two examples are given for the kinetic energies for a single link and two link robot arm. In the single ...
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5answers
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Why we want to write all linear system into form of first order differential equations?

It seems to be taken granted that when we deal with some control system, the first thing we want to do is to linearize the system and put it in form of first order differential equations like $\dot x =...
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1answer
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Challenges involved in designing an Industrial Robotic Arm [closed]

I was wondering if any robotics engineers around would kindly, provide suggestions on the following: I was recently hired by a company that wants to implement a robotic solution in manufacturing ...
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2answers
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sampling algorithms in motion planning and local minima

I am trying to run RRT algorithm for motion planning for a quadrotor. The quadrotor ends up sometimes in corners without reaching the goal. I realized from sources online, that it is due to local ...
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1answer
67 views

D-H parameters verification

This robot has 2 revolute joints in advance then one cylindrical joint, then one revolute joint, then another cylindrical joint, then three revolute joints at the end. There is no D-H table for that ...
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2answers
70 views

Controlling Stepper or DC motor with L298 or L293 and getting operation similar to Servo for 6 dof arm

I will be using 1:4 gear ratio and thus will require a motor with a continuous 360 motion and a high torque for efficient functioning. Servo motors with continuous rotation and high torque are very ...
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4answers
286 views

Denavit-Hartenberg convention in practice

How are the coordinate frames and D-H parameters determined in industry? Does one use the CAD drawing of the arm or physically take measurements of the actual arm?
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1answer
85 views

Finding Joint speeds for each joint of a 6DOF arm (UR10) using the Inverse Jacobian

Background: I have access to a UR-10, 6DOF robotic arm through my school (I'm very new to robotics). I know the desired set of linear speeds that I want in the x,y, z-direction in terms of the end ...
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2answers
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How to move a Stepper Motor to a desired angle with raspberry pi?

I will be using stepper motor in 6 DOF robotic arm along with Servo motors. Unlike Servo motor ,I find difficult to control Stepper motor. I was earlier using only Servo Motors but due to lack of ...
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Are there standard angular velocities when it comes to robotic arms?

for manipulators that lift heavy loads, e.g. a car or a cow, what would be the ideal angular velocity? Are there any standards for arm safe moving speed? (of course I know it depends on the project ...
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1answer
51 views

Creating linear end effector motion using joint speeds: Converting tool speed to joint speeds

Background Information: I'm new to robotics and my school currently has access to a 6DOF Universal Robot (UR-10). I'm programming it using its scripting language URscript and the arm has these two ...
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1answer
113 views

Control Pneumatic Cylinder Position with Potentiometer and Analog Comparator on Arduino Uno

I am building a robot arm that is actuated by a pneumatic cylinder. Extending and retracting the piston would increase and decrease the joint angle respectively. This is done using a 5/3 solenoid ...
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29 views

How to calculate the forces acting on an object of mass 'm', which is vacuum gripped at the end of a robot arm? [closed]

I would like to understand, how to calculate the forces/what all forces act on an object that is currently being gripped by a suction gripper and when it moves. Gravity is one, which will cause the ...
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Best way to actuate J5 (wrist) on 6 axis robot arm?

I'm designing a robot arm with an intended payload of ~2 kg and 60 cm reach. I've been working off of the AR2 arm design, which has the typical turret | shoulder | elbow | wrist roll | wrist ...
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1answer
127 views

Transformation matrix using DH parameters

I want to write a Matlab function which takes the DH parameters as input and outputs a 4X4 transformation matrix. The code I have written is : ...
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1answer
96 views

Which motors are specifically used for UR3 (Universal robot arm) [closed]

I am looking for the specification of UR3, peak torque and rpm.
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2answers
169 views

Understanding MoveIt! and OMPL more deeply

I wanted to know the actual mathematics behind the path planners MoveIt! uses for manipulators from OMPL. I tried to look into source codes but couldn't get enough details. I wish to know: How cost ...
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1answer
256 views

OnRobot RG2 Gripper on UR3 with TCP communication

I am using a UR3 Robot with OnRobot RG2 Gripper. I have successfully connected the robot to my computer via Ethernet and i am able to send move commands and receive data successfully with Python. But ...
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Orientation problem between Gripper and Object ??

I am working on a pick and place project using ROS & MoveIt!, I wrote my own pick and place functions which generate grasp poses according to the pose of the object and then automatically picks. (...
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1answer
39 views

Two 4 bar mechanism vs stepper motor on each linkage in a 4 DOF robotic arm

I am planning to make a 4 Degree of Freedom(DOF) robotic arm. I have a confusion in mechanical design of the robot. Shall I use two 4 bar mechanisms to reduce the number of actuators? or a stepper ...
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1answer
40 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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1answer
53 views

Using python to create AI

Just asking a quick question about implementing some python AI. I have a home built circuit running an ATmega32u2 chip and I was wondering if it’s possible to use this code on the chip? Or do I have ...
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Simulation of error in following trajectory for robot manipulator

I am working on a surgical manipulator project where I have optimized the link lengths of the manipulator for maximum isotropy. Does the maximum isotropy reduces the error in following predefined ...
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140 views

How to find jacobian using kdl that matches with bullet physics jacobian

I am trying to calculate jacobian with kdl (pykdl) and bullet physics (pybullet). With bullet physics I can only find Jacobian of whole robot, but I want to find Jacobian for a kinematic chain. So I ...
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1answer
183 views

How to plan path for robotic arm with RRT?

I have written simple RRT planner however I am not sure how to apply it to a robotic arm path planning. The issue is that of analytical solution absence to inverse kinematics problem. Let me explain. ...
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44 views

Straight Line, Point to Point Movement

I am currently programming a robot using G-Code to draw basic shapes with a pen. When simulating my code for a square, the robot moves from a corner in a diagonal line, until returning straight. At ...