Questions tagged [robotics]
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Motorizing a tv mount
Let me preface my question by a disclaimer: I don't know for sure if the format of this question fits this forum, I hope it does. Here it goes:
I recently bought a tv mount from Amazon, which is ...
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Where to find Ball and Revolute Joints with friction
I am new to design. Where do I find bearing joints that stay put? Suppliers? I am looking for.
A ball joint that has friction so that it stays put after it is moved. I was looking at modeling one ...
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How can I link two plates in such a way that one is able to freely move in 2D planar directions relative to another?
I'm designing a mapping robot that basically bumps into wall and records the position in its log. As safety mechanism I want to install kill switches in min 3 directions around the roughly circular ...
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What weight on a still stepper motor?
I want to make an extending leg that uses a stepper motor at the bottom, spindle upwards. With a screw thread at the end of the spindle. The motor will rotate to push up a nut which will push up the ...
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Dimension does not appear in Denavit-Hartenberg formulation
Consider the robot and Denavit-Hartenberg table in the picture below
The revolute axes of the robot intersect. Positive direction for the first revolute joint is to the right and that for the second ...
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How to automate this seemingly easy manufacturing process?
We are a physical bird repellent manufacturer and use stainless steel to manufacture these things:
We have a fully built out infrastructure that does everything from cutting the steel strip to pieces ...
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Understanding moment load on axis (for robotic arm)
Check Pete comment for explanation below :) thank you Pete!
I need help understanding a concept im struggling with for quite a while now.
Im looking at different type of robotic arm designs, and some ...
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Spring compression and quick release mechanism
I'm in a group and we're designing a wheel that can inflate and decompress using springs. The purpose of the string compression/decompression is to give our tires this jumpy/bouncy like movement. ...
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Locking mechanism by tightening a clamping knob, how to estimate the force required?
I am currently thinking of a way to lock a piece sliding in and out of a slot, as shown in the diagram supplied, using a clamping knob and M6 bolt pushing onto the inner groove of the linear piece and,...
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Function blocks used in MD drive cannot be used in AD drive
I program Schneider PLC and Machine Expert program
Normally I was using Schneider's SD or MD type drivers but now I need to do this program with AD driver but my function blocks are not working.
For ...
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Help Designing an Electric Wheel Hoe: Identifying Required Materials and Torque Control Mechanisms
I am currently working on designing an electric wheel hoe, and I need help determining the required materials for its construction. The goal of this project is to create an automated version of a ...
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Why aren't Dielectric Elastomer artificial muscle actuated robots more common?
Well, while searching for dielectric elastomer actuators I can find that they normally have efficiencies around 80% or more (source page 38), they are cheap and easy to build.
But the more I search ...
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How do you calculate the energy released by a gas spring when it is released from being fully compressed?
I'm a Freshman Mech E Student, and I'm designing a 3lb Combat Robot for a club. I wanted to be weird and use something I've never seen on a bot before. It's a fun design challenge, but physics ...
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Creating Data-Processing Machines with Screens: Can Arduino or Raspberry Pi Do It?
guys! I'm a web developer, and I want to create some small machines that have a screen at the front. This machines will accept data, process it via an HTTP request, and display the results using a ...
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Do robotics applications run in an operating system or are they written entirely as operating system?
Do robotics applications run in an operating system, such as those used in industrial automation, computer vision, or are they developed entirely as operating systems? I'm curious about the role of ...
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Serving for automatic vending machine
I want a serving mechanism for my vending machine. For my mahine, our product (fried ice cream) will fall into the air fryer and fry it, and then it will come to the plate or bowl to serve. I want to ...
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How are the motors coupled to pulleys in this scara robot?
Several years ago the CoRETS group posted a animated video about a novel SCARA robot https://youtu.be/P3iIIqFkSIc but there are no references to it in the literature. I cannot understand how the two ...
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Number of degrees of freedom of parallel mechanism
Can anyone provide me with the number of degrees of freedom (translational and/or rotational) at point P?
Edit with my assumptions:
The left picture shows the mechanism from the side and the right ...
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PID for keeping heading, for combat robot, how to handle sudden multiple rotations
I'm building a beetleweight class (mass 3 lbs) combat robot, it will use two wheels for tank-style drive and a horizontal spinner weapon. This robot will serve as an experimental platform, I want to ...
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Torque for rotating base
I'm designing a simple robot arm but I don't know how to calculate the torque of the rotating base for the robot arm so I can choose the right gear ratio for the stepper motor that will be in the base,...
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Engineering graphics for robotics
I am intrigued by robotics and wish to pursue it with a fundamental approach. Could you recommend some valuable courses, links, or books that can help me begin my journey in engineering graphics?
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Does MEMS/Optical Gyroscope record Earth's Rotational and revolutional angular velocities
I am using a 3 axis gyroscope (Android device) to record angular velocities using a sensor data logger application.
When the device is placed stationary, the gyroscope recorded the following values:
...
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Building a laser-pointer array for my buddy's pool table
this is my first post here. I'm a software engineer by trade, but I have a 3d printer so that makes me a mechanical engineer, right?
Clearly not. However I do have some rudimentary skills and have ...
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Bounce/Vibration in a Beam drive by Harmonic Reducer
I have a system that is set up in the following way
a harmonic reducer with a beam attached (50:1)
the direction of rotation is perpendicular to gravity
the beam extends to both ends at an equal ...
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Where do I find mechanism for paper flipping and refeeding in printers?
I've started out in engineering and can't seem to find the mechanism in printers that flip and refeed the paper back for printing. There are a few engineering YouTube videos that show machine ...
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Why continuum robots aren't common on CNC machining processes?
So, I was searching on google/youtube about minimally invasive procedures and its tools to reach deep and delicate spaces of the human body, and it came to my mind the possibility of using it for CNC ...
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Center of gravity offset for accelerometer and gyroscope readings
I am working on a 6DOF IMU that contains a 3 Axis Accelerometer and a 3 Axis Gyroscope.
I am building a project to plot the postion and orientation of the turret/cabin in a crane in 3D space.
The IMU ...
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Are the production lines for military vehicles (incl. tanks) automated (with industrial robotics) similarly to the mass-produced cars?
My country is participant in one military vehicle production product and the price tag is almost 5-10 times higher than for mass-produced non-military vehicles. We have no industrial robots for such ...
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Torque calculation for a robot [duplicate]
if I have a robot 50kg, 6 wheels and i want to move it inside a sewer pipe what is the torque required?
and there is any DC motor model can satisfy this function?
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Are vacuum actuated artificial muscles as hard to control as the pneumatic ones?
I was searching for questions on this stack and I found this one asking why pneumatic/hydraulic artificial muscle robots aren't common, TLDR: the reason is that it is incredible hard to control them.
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DC Motor - need to go to 200-10,000 RPM
I'm currently working on a setup with Raspberry Pi, a 12 V DC motor and a L298N driver. I need the motor to go from 12000 RPM to 200 RPM, or at least in that range - the only problem is that the L298N ...
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Sensor fusion for IMU
I'm working with MPU-6050 sensor with Raspberry Pi 4. I can read acceleration and gyroscope raw data from the sensor. However I want to get yaw, pitch and roll angles from these data. I tried to ...
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Analysis of a Beam under Non-static Case
I am interested in the distribution of the beam in nonstatic cases.
Typically we discuss the stress, and moment distribution when a beam is in a static case.
However, I am interested in this ...
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How do you make custom springs and where could you buy them?
A friend and I are working on a combat robot that uses a special drive. This drive requires a spring with a large wire diameter (over 3mm), a large outer diameter (40-70mm), and a large pitch (60-90mm)...
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Incremental encoder with memory
I'm working on a robotics project. In this project we need to control the angle position of the wheels. We are going to use an incremental encoder (we didn't find an absolute encoder that was able to ...
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Determine vector components based on vector scaling and change of origin
Consider a known vector k and an unknown vector L. L is positioned between vector k and an unknown fixed point in space. The vector L is comprised of two components, but is subject to change over time,...
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Differential Drive Kinematic Constraint Determination
I'm working through a paper to better understand Differential Drive Mobile robots and I'm a bit stuck(fairly early in the paper) on how one of the constraints is derived.
The paper is here, https://...
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Connecting a brushed direct drive motor to a wheel with no holes in the hub
I am building a 4 wheel drive rover robot. I was very lucky to find four good condition wheel chair motors on the side of the road. I had to disassemble the wheel chairs of course but well worth the ...
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Torque Problems vs Motor Problem?
I want to preface this by saying I am software engineer so each part of this robot build has been a lesson on its own. From welding, to CAD design, pillow block bearings, etc, etc....
I am working ...
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To design the system of a rectangular small shaft moving in and out in a completely mechanical way without remote control
In my setup , I have designed a system in which a body will rotate and execute rectilinear motion down the screw along its thread . upon reaching the bottom most point I want to make a system in which ...
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Artificial Muscles for a Robotic Hand
I would like to build a robotic hand.
Suppose all of the finger movement is controlled by a set of strings that are attached near the joints of some 3d printed skeleton hand and all exit through the ...
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Is the DOF for a robot mechanism invariant if it is not in a different configuration?
I understand that if the robot is reconfigured, it can potentially change the DOF, but would the degrees of freedom for the robot also change if specific links were fixed and as such specific joints ...
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Digital servo for my robot arm?
I'm planning on using this servo for my robotic arm project:
Amazon link.
It's a digital servo with 35 kg-cm (3.4 Nm) torque. However, when looking at other robotic arm projects, I've mainly seen ...
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Calculating Torque With a Second Arm Attached to the Main Arm
I am working on some code that will handle the arm of a robot, and I want to be able to hold the arm in place against the force of gravity. The arm is in 2 parts just like a human arm and I intend to ...
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Relationship between the infinity norm of estimation error and the trace of estimation error covariance matrix in Kalman filter
I am working on designing an interconnected distributed control system. In this system, I need to use Kalman filter because the measurements are noisy.
I have two questions:
1 - What is the ...
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What does a dual bearing motor mounting system look like?
I came across the following excerpt about how to mount wheels:
The most robust system is the dual bearing system. In this, the wheel
axle is mounted on two bearings and chain driven. This takes all ...
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How to maximize strength/torque of a joint?
I'm an elec engineering student and so mechanics isn't my best field, apologies if the question is straightforward.
If i have a robotic joint (e.g elbow or knee). What are the best methods for ...
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Is this kind of steering possible?
I would like to build a small robot and was wondering if a particular configuration of steering would even be possible and stable.
What I would like is to have the two rigid axles mounted on a ...
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Torque Required From Motor For a Project
The device I am building is responsible for supporting 200 lbs and is required to accelerate 10 feet per second. The device will have two 8 inch diameter wheels. I have worked out what I believe to be ...
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Required Motor Torque [duplicate]
I am interested in constructing an robot which will be responsible for supporting a 200 pound load. There will be four wheels and the diameter of the wheels are 8 inches. The robot will be required to ...
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