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Questions tagged [servomotor]

A servomotor is a closed-loop servomechanism, typically used in industrial applications. It usually consists of a motor coupled to a sensor (e.g. encoder) for precision position feedback, typically using a low ratio gearbox or direct drive.

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RPi 4B + PCA9685

I am working on project that requires lots of PWM channels and decided to use PCA9685 and Raspberry Pi 4B as my controller, which I've never used. I installed Ubuntu 22.04LTS in order to use ROS-...
msalaz03's user avatar
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How can I troubleshoot these under-powered servos?

I have three 150kg servos installed in a robot arm. I have tested them successfully when connected to a servo driver hat on a raspberry pi zero 2w (image). However, they were under-powered because the ...
user3342256's user avatar
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Dynamixel Motor - Clarifying on the use of Position Read

Clarification: I would like to clarify whether it is ok to use "position read" on the motor position while in velocity mode. Context: So I am using the XC330-T288-T motor and basically ...
akroyal's user avatar
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High speed, high precision motors for a Spherical Parallel Manipulator

As the title says, I am looking for motors suitable for my Spherical Parallel Manipulator. The Spherical Parallel Manipulator will have a camera (likely a DLSR) mounted to it. The motors need to be ...
Mike's user avatar
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MG995 not working under 3A and 6.96V

I'm trying to work with this type of servomotors, I've been having a hard time trying to supply the required current to it, these are the things that I've tried: First, I tried creating my own power ...
Ximena Pinacho's user avatar
2 votes
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21 views

Coordinating long-running actions with independent threads [closed]

Basically, some things have real-world durations that need to be accommodated. For example, moving a servo arm 180° will take a significant number of milliseconds. What is the best practice for ...
RoUS's user avatar
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237 views

How to control the position of a load shared between two (servo)motors?

I want to position-control an axis combining the action of two DC servomotors - one of them alone is not powerful enough; I had those available and preferred not to buy a new one. I have not the ...
temporary_pigeon's user avatar
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Robotic arm simulation in MikroC

I am supposed to control a robotic arm with a servo motor. The angle of rotation of the servo motor depends on the voltage of a potentiometer. A0 can read analog inputs and C2 can hold a PWM signal. ...
Volpina's user avatar
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2 answers
322 views

Powering 3 MG996R servos

I'm building a robotic arm with 3 MG996R servos using Arduino Uno R3 board. I'm using this 16 channel servo motor driver for the project. I'd like to use an AC-DC adapter to power the servos. Is that ...
Abhishek A Udupa's user avatar
1 vote
2 answers
110 views

How can such a small motor produce so much torque?

I have only recently gotten into robotics - so I'm not that familiar - please excuse me if this is a silly question. I was looking at servo and stepper motors. I can see that a lot of servo motors ...
John Hon's user avatar
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What is the type of electric motor that can lift 1.6 kg just like micro servos, but without the reduction gear?

Micro servo motors, normally the 9g type can lift 1,6kg with a reduction box made of nylon. However, I'm interested on lifting this amount of weight (1,6 kg) in a faster rate in the axis of rotation (...
Fulano's user avatar
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Floppy fish mechanism design

I've bought a floppy fish toy (crab version) for my kid. The toy looks like: Unfortunately, the toy mechanism inside jams when grabbed and the battery lasts for a short time: I tried to do my own ...
SKJQ's user avatar
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What type of actuators are needed for a high accuracy, low load weight robotic arm?

I am trying to build a robotic arm that needs to lift a very low amount of weight (between 0.01-0.05kg) at a time, but it needs to be very precise (+/- 1mm accuracy ideally). The robot really only ...
Skrish's user avatar
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1 answer
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How to Implement a Physically Human-Controlled Robotic Arm?

I'm a complete beginner in robotics other than FIRST competitions at my school. I wanted to make a robotic arm that works by a person physically moving the end-effector in 3D space and the robot ...
okayatcp12's user avatar
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What type of motor (size, type, approx cost) would be best to use to open a bedroom window

I noticed a tag showed up that indicates a servomotor. This looks like what I want. My new question is what size of a servomotor do I need to move a window that is approx 3 feet by 2 ft 8 inches....
lonestarkid's user avatar
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How does a biped humanoid robot like OttoDIY move?

How does a biped humanoid robot like OttoDIY moves? What is the sequence of foot & legs servos? Can make it move forward, by lifting one foot up and turning leg, and then repeating the same steps ...
Priyank Bolia's user avatar
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1 answer
152 views

What kind of motors do industrial robot have?

What kind of motors do industrial robots use and how do you control them?
Da Mango's user avatar
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2 answers
88 views

How to add precise amounts of ingredients in my beverage making robot? [closed]

I am currently in the process of making a robot that can make a cup of tea, when It receives the command to do so. The general idea is as follows: checks if saucepan is placed checks if milk is ...
abdullah mohsin's user avatar
1 vote
1 answer
167 views

HW limit servo motor range

I use MG90S servos(180 degree) for my robotic applications. In few places, all I need is a 30 to 90 degree range of the motor. The motors use a 5K pot for control. Can I change this pot to have ...
Balaji S's user avatar
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1 answer
2k views

How to control a servo using ROS2 and MICRO-ROS

I am currently using a raspberry pi pico and a raspberry pi 4, So far I have established a connection between the two using micro-ros-agent I have also successfully built and ran the example provided ...
Aniket Wagh's user avatar
1 vote
2 answers
339 views

How to avoid oscillations caused by backlash in position control?

I am working with a ball screw mechanism driven by a brushless dc motor with an encoder mounted on the load side. We are using a PID position controller with tuning settings by optimization however ...
controlsHeaven's user avatar
1 vote
2 answers
243 views

stepper or servo torque in one direction only

What I want to achieve is this. I have a rod, which I want to move only in the direction of its axis, but move it (ideally) without resistance, meaning that If i pull the rod, I want it to follow (...
MirrorMirror's user avatar
1 vote
1 answer
489 views

How to calculate operating torque and holding torque of a slew drive for a manipulator arm?

Hope you are doing good and enjoying your weekend. I have a question regarding calculation of torque and tilting moment for a slew drive. Slew drive (motorised) will be used at the base of a ...
techno's user avatar
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2 votes
2 answers
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Servo Starts Oscillating Under Disturbance

I'm using MG996R servos to control a 6-axis desktop robot arm. When no disturbance (like a gentle push to the robot), the servos are fine and can hold their places. But under a gentle disturbance, ...
Ruotong Jia's user avatar
1 vote
1 answer
280 views

MG996R issues with Arduino

I am working on a robot dog, and using 12 MG996R servos. I am powering the servos via a 2S LiPo battery, and I have the battery's negative tied to the Arduino's ground to prevent ground loop issues. ...
Proxy303's user avatar
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3 votes
1 answer
259 views

How to attach plate to stepper motor?

Total noob here (never touched Arduino before today), & have pretty much no hands-on technical experience (although with lack of experience, I make up in enthusiasm to learn!) Question: How do you ...
Tee's user avatar
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1 answer
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I need to make something that can slam something into something else really fast in both directions

I'm fairly new to robotics, but I have this idea for a machine. I've done a bit of research but can't find exactly what I'm looking for. I need something that can either move back and forth at at ...
bgavin's user avatar
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1 answer
1k views

Finding torque equation for my robotic arm

I am designing a 5 dof robotic arm, and for that I would like to find a torque equation. However, I am a little confused here: According to me the torque equation for M1 should be l2m2+l3m3+l4m4+l5m5 (...
MrDeepak's user avatar
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3 answers
344 views

Servos jittering problem

So I started building this 3D printed Bluetooth robotic arm that can be controlled via MIT app inventor from HowToMechatronics.com. After connecting all the servos and running the code, the servos ...
darren's user avatar
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Power pack and servo driver for robotic arm?

I have a robotic arm that uses about eight 7.4 volt volt high torque servos. (https://www.servocity.com/2000-series-dual-mode-servo-25-2/) I need to know what Kind of battery system I can use to power ...
X Builder's user avatar
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1 answer
1k views

Servo motor vibration problem

I'm working on DIY robotic arm. Robotic arm has 5 servos. The problem is that servo motors are shaking. I found different solutions but none of them works. What happens is that when I connect one PWM ...
Atuka Lomidze's user avatar
2 votes
2 answers
250 views

How to choose a servo motor for solar tracking mechanism?

I design a solar tracking mechanisim. You can see the very undetailed representation in the pic. For choosing a servo motor how can I calculate the torque etc?
HollyPolly's user avatar
2 votes
1 answer
150 views

I've got a few servo motor questions

How can I measure the amount of voltage I'm giving a servo motor? How can I give a servo motor the correct amount of power it needs to run at it's full potential? Say I had this motor: ANNIMOS 60KG ...
Anonymous's user avatar
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0 answers
245 views

What should be my spray handle-servo interface for pull mechanism? [closed]

I am an electronics engineering student who recently started working on Arduino. As part of my efforts to wake up on time, I decided that I should make an automatic water spray alarm clock. I have all ...
Prasanjit Rath's user avatar
1 vote
0 answers
164 views

Smart Servo Motor Type Comparison

I have been using the standard MG90/SG90 servo motors for years now and am familiar with them. Recently, I am trying to build a robot dog with them with no success. The motors keep on vibrating and ...
DragonflyRobotics's user avatar
1 vote
1 answer
100 views

Reducing stress on servo axle

I am designing an articulated robot arm that will not need to hold essentially any weight at its end, but that will need to perform thousands of repetitions (currently using MG 996R servos, but might ...
Obor's user avatar
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0 votes
1 answer
90 views

Do hobby servos respond to step inputs with a step in torque?

I'm designing a piston that I need to expand a few cm in <100ms to load energy into a spring-mass system with around a pound of force (as shown below). Based on power specs alone, high-end hobby ...
concat's user avatar
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0 votes
2 answers
888 views

Make servo's shaft longer [closed]

I’ve got a few servo motors MG995, MG996R, etc. For my make I need a servo to have a longer shaft – 6cm or so. I cannot find a way to achieve it. There is lots of Shaft Coupler for steppers and DC ...
zhekaus's user avatar
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0 votes
1 answer
528 views

Does the Grbl have S-curve or harmonic velocity profiles?

I'm working on a machine and the position has a high impact by the jerk and acceleration of the machine. I'm using Grbl for my machine. Does Grbl has S-curve or Harmonic velocity profiles?
Khushal Badhan's user avatar
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1 answer
72 views

Controlling Integrated Servo motors with PLC for 5 DOFIndustrial Robotic arm

I am working on developing a 5 DOF robotic arm having 50 kg Payload using PLC, we are willing to source the integrated servo all in one (servo drives, encoder, and servo motor) with no breaks and ...
Muzammil Ibrahim's user avatar
0 votes
1 answer
138 views

How to convert torque in oz-in into the weight it can withstand?

I am looking at servos to make a robot claw, and I want to make sure the one i am getting can turn under a specific amount of weight. The servos specify their torque in oz-in. I am not sure how to ...
X Builder's user avatar
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5 votes
1 answer
9k views

Servo horn dimensions - What is 25T?

I wonder that horns for servos are marked in some T units. Example: 25T Please help me getting out, what does it mean.
filimonic's user avatar
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What should be the required operating voltage for Servo motors in my 5 DOF robotic arm, with 50 kg payload

These are the estimated torque values of all axis in our applications 1st Axis- 226.57 oz-in - 478oz-in 2nd Axis- 756 oz-in -1590oz-in 3rd Axis- 356 oz-in - 749.7 oz-in 4th Axis- 188 oz-in - 395 oz-...
Muzammil Ibrahim's user avatar
1 vote
0 answers
235 views

Controlling high torque servo motors with Raspberry Pi

I need to control 10 Standard Servo Motors (operating at 4.8-7V/300mA-1A/2.5kg-5kg torque) in my project. I'm using RPi as my processor and I was looking for a servo driver. I came across PCA9685 16-...
Saurav Kulkarni's user avatar
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1 answer
43 views

Given this old pin diagram and numbers on this old encoder, what would be a suitable modern encoder to use?

My place of work has recently acquired a Hydraulic Press Break from the 80's. It has a CNC controlled back stop which is driven by a DC motor and Screw drive. The encoder which couples to the motor ...
Nick Bowyer's user avatar
0 votes
2 answers
61 views

Measuring a Motor's Internal Temperature

As a final safety measure regarding some high wattage motors, I want to measure their temperature (either internal or surface) in live time so that I can automatically kill the power if it crosses a ...
grahmW's user avatar
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1 vote
1 answer
762 views

Control a servo (two position 180-degree swing) with an On/Off switch without microcontrollers [closed]

For my application, I need to be able to control a servo with a simple on/off switch. When it's off (pulled LOW), I need to servo to go at -90 degrees and stay there - possibly for a prolonged time. ...
Dmitry Alergant's user avatar
1 vote
1 answer
3k views

What is the difference between the holding torque and stall torque of a motor?

Do the terms holding torque and stall torque imply the same thing? The information on torque for these stepper motors is given as holding torque. While these servo motors have the torque given as ...
RTT's user avatar
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1 vote
1 answer
45 views

How is this torque value arrived?

I'm going through this person's torque calculation of a simple crane setup. the servo used has a max torque of 57oz.in: At the top, if Mservo is 34.12oz.in, how is ...
John M.'s user avatar
  • 563
1 vote
1 answer
834 views

Rotating a lever with a small servo

I'm trying to rotate a lever link to gently "offload" a load using a servo. Here's a drawing: Here, the red is a lever, yellow pivot and black is the load. To offload, the lever needs to be turned 90 ...
John M.'s user avatar
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