8 votes
Accepted

Servo horn dimensions - What is 25T?

The T indicates the number of teeth or ridges in the servo spline. You need to match the servo spline to any device splines or they won't mate. :EDIT: Because it's ...
Chuck's user avatar
  • 16k
5 votes
Accepted

Measure weight of an object using a servo

This is going to depend on the style of motor in the servo and the style of gearbox. If the servo can't be back-driven when unpowered, then it's likely some form of a worm gear assembly that will ...
Chuck's user avatar
  • 16k
5 votes

What servos are suitable for a robot like Boston Dynamics’ Atlas?

The Boston Dynamics’ Atlas robot doesn't actually use servo motors. It uses electrically-powered hydraulic actuation. I saw a presentation by Boston Dynamics' Marc Raibert where (if I remember ...
sempaiscuba's user avatar
  • 1,064
5 votes

What kind of motors do industrial robot have?

Most industrial robot have servo motors. This allows you to control velocity, torque and position of motors - the latter usually in some form of closed-loop control system. I work for Stäubli. Our ...
Jim's user avatar
  • 314
3 votes
Accepted

Steering using different speeds in DC motors or using a servo?

I have been working on upgrading an autonomous robot as part of a university project for the past year. As part of my work I have been switching the old skid steering system to a new active steering ...
TechAUmNu's user avatar
  • 121
3 votes
Accepted

2DOF arm with quick movement: Stepper, servo, or DC motor?

Servo mechanisms are not the "popular" RC-Servos (not-only). Servo is a closed-loop control, not only for motors. Even Steppers could or not be servo-motors. RC-servos are in major cases a DC brushed ...
Diego C Nascimento's user avatar
3 votes

Can we simulate a actuator with a very strong torque with a PID controller

What you're asking for cannot be accomplished with a PID controller. As I understand your question, you want to be able to choose PID gains that would always produce a "good" trajectory, ...
BarbalatsDilemma's user avatar
3 votes

Which kind of motors and how powerfull should they be for a robotic arm

This type of question "how much torque does my robot arm need" has been answered many times on this site: Simple equation to calculate needed motor torque Design and construction of universal robotic ...
Ben's user avatar
  • 5,855
3 votes

Best way to estimate velocity of motor with encoder

You could employ all the techniques you mentioned that are model-based though, meaning you need to provide a good model of your system and then tune the parameters. Alternatively, there are other ...
Ugo Pattacini's user avatar
3 votes
Accepted

How to calculate the right needed Power?

The maximum (or required) torque alone is not enough for sizing a motor, it is one of the factors. Motor maximum (sometimes refereed to as peak) torque differs from nominal torque. The maximum ...
50k4's user avatar
  • 6,652
3 votes
Accepted

Servo Starts Oscillating Under Disturbance

I can add one more point to RowanP's excellent list: the servo's PID is unreliable, not because of a defect, but because it is mistuned for your application. Recall that tuning a PID control is arcane,...
r-bryan's user avatar
  • 1,271
3 votes

How to avoid oscillations caused by backlash in position control?

Backlash is only an issue when you change directions, because that's when you'll open the space in the gear train. If you're using PID control, consider an overdamped response instead of a typical &...
Chuck's user avatar
  • 16k
2 votes

Steering using different speeds in DC motors or using a servo?

Automotive style steering can actually be simple. The conventional car has just one motor that powers two rear non-steering wheels through a differential. The differential solves the problem of how ...
user3150208's user avatar
2 votes

How to test how much current 9 servos can draw at a time?

I assume that all the servos are identical, so it is enough to measure only one, and multiply the result by 9. The best would be if you could use a lab bench variable power supply, like this. With one ...
Bence Kaulics's user avatar
2 votes
Accepted

Calculating screw breakaway torque

You can approximate the breakaway torque by considering static friction only. From the static friction coefficient of the lead screw (by knowing the maximum load on the spindle, coming from the ...
50k4's user avatar
  • 6,652
2 votes

How to power this servomotor?

No. If there is no {installation, electrical, maintenance, etc} manual/description etc. (and maybe add also quality certificate also here) it is not fair to assume anything. Buying something without ...
50k4's user avatar
  • 6,652
2 votes
Accepted

What exactly does a motor driver do? Why do we need an additional power supply for motors?

At a high level, a motor driver takes a "logic-level" input (desired "effort") and delivers a corresponding "high-side" output to the motor. Exactly what is inside the motor driver depends on the ...
combo's user avatar
  • 450
2 votes

How to calculate battery size for servo motors?

This typically requires a bit of testing with your actual payload. You can try to model it mathematically, but it's easier and more accurate to just plug it in and measure the current draw. Current ...
Joe Baker's user avatar
  • 597
2 votes

Which motors are used in boston spot robot

I had the chance to play with Spot this afternoon and it is not hydraulic. I bet for a stepper motor with cycloidal gears and position encoders. But I not really sure which kind of motor. They didn't ...
nowox's user avatar
  • 121
2 votes

Granite devices IONI servo drive

Although the Analog setpoint resolution isn't documented on the Granite Devices Wiki, the ADC in IONI is 12 bits.
Granite Devices's user avatar
2 votes

Mounting on servo horn

While all sorts of things get used in experiments, screws really intended to tap into plastic have larger more aggressive threads than those intended to go into a pre-tapped hole in a harder material ...
Chris Stratton's user avatar
2 votes

Why are some motor shafts stiff while others spin freely when not powered?

IMHO it depends on two factors: if there is gear on the servo (so to motor rotates fast, the result is slow precise motion with high force), then moving it manually even little means to rotate the ...
gilhad's user avatar
  • 453
2 votes

How to program a continuous servo motor? (Arduino)

I believe by continuous rotation servo you mean servos similar to TowerPro MG-995 or Winch Servo HS-785HB. For such servo, the normal Arduino code for servo motors won't work. You have to define <...
ron123456's user avatar
  • 179
2 votes

Industrial servo motor

The answer is yes you can I looked at at the users manual for the asda-a2 and it looks like it will close the servo control loop for you and also gives you several good control options. All the ...
markshancock's user avatar
2 votes

Robotic arm select servo motors

Well it seems that length is your problem.I came here having a similar problem to yours with designing a robotic arm. Servos that can pull this weight go for 500+ USD. Adapt the length and weight of ...
ChristosS's user avatar
2 votes
Accepted

Robotic arm select servo motors

There are two general categories of servos, hobbyist and industrial. Hobbyist ones generally go up to about 50kg/cm, and some will do more than that but costs multiply (sometimes these are called ...
user3685427's user avatar
2 votes
Accepted

Kollmorgen S300 drive oscillation

I just looked up the model number and it's a servo drive. If you did not tune your servo axis then you will have very bad performance, and what is happening is to be expected. You need to tune your ...
Mike's user avatar
  • 361
2 votes

18 MG996R servo motors control and power

Yes, there are servo controllers capable of even 24 servos. As example, check out Pololu Mini Maestro board. It communicates with RPi through USB or UART and You can find more information about that ...
Szczepan's user avatar
  • 450
2 votes
Accepted

How should I power my servo motor with the Adafruit PCA9685 chip?

Have you tried to connect the PAD supplied with the HSB servo the fifth picture on this page? It is not necessary but in the case that your battery is fully loaded it an cause an overload if you don't ...
fcebron's user avatar
  • 66
2 votes

Encoder attached to output of gearbox of stepper motor

Here is the response from stepperonline about their closed loop stepper controller. Glad to receive your inquiry. You can't install the encoder on the output of the gearbox. This is uncorrect and ...
henradrie's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible