[Robotgroup] Question ... servo or stepper motor ?

[Dave Hylands]

Hi Tom, 

> One other thing to think about,  modified RC servos do not 
> generally have linear speed response, they are designed to seek 
> to a position with a given torque load.
> Unless you replace the original electronics in the servo, you 
> wont get good low speed control.

Yeah - I did some tests with a couple of HiTech servos and they seem to
have constant speed except during the accel/decel at the beginning and
end.

The position is very linear with pulse width, but the speed isn't.

http://www.davehylands.com/Robotics/Servos/index.html


--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/