Servo trouble

If a servo is  not powered it will not resist rotational forces applied to it. So in your words it will fail

there may be some models of servos with locking mechanism but I am not aware of them

a motor can also be so some what braked by shorting it's winding which will cause it to self lock

this could be done with a relay, great care will be needed to not apply power while the relay is closed of course

In the servo' can I had a locking mechanism?

Secondly, the motor never moves although power supplied until signal is given. So would love an explanation (sorry for the explanation)

Peter Oakes wrote:

a motor can also be so some what braked by shorting it's winding which will cause it to self lock

how to do it?

if yo take a simple motor, a small one out of a toy or something

with nothing connected to the motor power pins, try turning the motor, it should move relatively easily

now put a short across the power pins of the motor (No power or anything, just a short), with the short in place, not try to turn the motor

with the short it should be far more difficult or even impossible without significant force to move it, this is because the motor is generating a reverse EMF that ends up opposing the direction of rotation.

this happens with pretty much any motor that has a magnet and coil arrangement

If you can live with a normal DC motor and use it with a worm gear, it should "lock" when not powered.

Try this ..

Open your browse and enter this in a google search

"how does a servo work"

the first two results give a good breakdown of how it works.

Mark

Peter,

how would I know which type of motor is inside. Plus how to do it?

Wong,

I'm using a servo built, don't want to break the servo. Even if I onpen to attach a worm gear, not sure out to do it and gear ratio. I want one with the exact torque as this one(If hand build)

-Radio Control Planes, Helicopters, Cars, Boats, FPV and Quadcopters - Hobbyking

I think you need to post a picture showing how you plan to do this, You talk about standing on the board with a servo holding it but the servo you linked is capable of moving maybe 40KG, not an adult or medium child and also it wont move it far

the servo powered will indeed lift / move that eweight but if you de-power it i would not expect it to be able to retain the weight if gravity is acting on the load (Scate board)

to a picture will definitely help here

Thanks

Peter

I don't want a skateboard and servo. Don't misunderstand. The skate board was an example. I just want to say how can I get the toque out of the servo without being powered. Just hold the object. Just hold a kinect without putting force on the holder.

if the load your holding is way under the limit of the servo there is a good chance it will hold it but I could not guarantee it, even looking at the speck you provided does not provide enough information in that regard, the only way to really know is to get one and try or email the manufacturer and see if they can elaborate on the concern

Servos typically  are not designed hold without power

Sorry I can not help further with this. I don't have one that can do this, all my servos will let me move them when there not powered but are very stron at holding their position when under power (Under power also includes receiving a positioning signal from the controller