# Thread: What is DOF?

1. Vacuum Tube
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## What is DOF?

hi.
i am a begginer in robotics, i want know what is 20DOF?
Because Robophilo offers 20DOF and robobuilder offers 16DOF.

cumpliments

2. ## Re: What is DOF?

[Post moved into it's own thread]

DOF stands for Degrees of Freedom. This means how many points on the robot can actually move. Sometimes they're referred to as "joints".

3. ## Re: What is DOF?

Each servo is 1DOF (degree of freedom, movable joint).

8-Dale

4. ## Re: What is DOF?

Originally Posted by Alex
[Post moved into it's own thread]
I moved it over to general - did I mess something up?

5. Quantum Gate
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## Re: What is DOF?

ya dof is easier by counting joints. basiclly its anything that moves by a servo is a dof. for example the elbow is 1 dof and the knee is 1 and if the head turns left and right that is one but if it also moves up and down then that is also 1 makeing him have a 2 dof head. do you pretty much see where im goin.. so pretty much a robot who has more dof can move more.. and is usually move expensive. like my bioloid robot that was a thousand bucks has 17 dof but honda's million dollar asimo robot has like 45 dof.
Last edited by openmindedjjj; 08-04-2008 at 03:21 AM.

6. ## Re: What is DOF?

Not just servos. Steppers and encoded motors, "muscle wire", air muscles, pistons, rams, screws, ... Any actuator that adds another degree of freedom is literally adding DOF - Degrees Of Freedom.

7. ## Re: What is DOF?

Originally Posted by openmindedjjj
ya dof is easier by counting joints. basiclly its anything that moves by a servo is a dof. for example the elbow is 1 dof and the knee is 1 and if the head turns left and right that is one but if it also moves up and down then that is also 1 makeing him have a 2 dof head. do you pretty much see where im goin.. so pretty much a robot who has more dof can move more.. and is usually move expensive. like my bioloid robot that was a thousand bucks has 17 dof but honda's million dollar asimo robot has like 45 dof.
Does it really?! That is freakin wild! I can't even imagine how you'd fit 45dof in a robot that size..

8. ## Re: What is DOF?

You can put 6-7 per leg, 7 per arm (26-28). 1 for the Waist rotate (27-29). You have the head (29-31).

Finaly you have the hands wich have a lot of DOF's. Maybe tehre are some extras in the toes too (FYI I just checked, it has 34 DOf, so you can have 2 dof in the hands to contract and something else.
Last edited by sam; 08-04-2008 at 11:57 AM.

9. ## Re: What is DOF?

I'm actually surprised at the "low" amount of DOF it has..

10. ## Re: What is DOF?

Hi,

IMHO: The total amount of servos does not always reflect the correct amount of DOF for a robot. Ex. a hexapod with 18 servos has 18 DOF per joint/servo but the body does also have 3 DOF (Global rotation). So I would say that a 18 servos hexapod have a total of 21 DOF.

Do you agree?

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