Post by Henning Wangerin
I'm looking for propotional servos for a small robotic projoct, where I
need small servos that can operate minumum 270 degress, but have not been
able to find any.
Most servos I have found either
- turns approx 170 degress, and that's not enough for my needs,
- or is continuously turning, witch is to no use as I need to be able to
move to a specific location.
except that it a rotation-angle of at least 270 degrees. 360 or more would
be even better ;-)
Do you have an idea on where I can get such servos?
I would be happy for any hints on where to find such servos.
You can find a servo that is capable of being modified for continuous
rotation and modify it by taking the pot out if possible. Now if you modify
the pot feedback with gears or pulleys, you could get 2X the output rotation
for 1X pot rotation. For example a 12T gear on the output shaft and a 24T
on the pot, then instead of 170 Deg full throw, you'd get 340 Deg full
throw. You don't have to use gears, you can use string and pulley's with a
spring for tension or something like that. If you read the pot ohms from
one endpoint to the other you could find a multi-turn pot that would give
the right change in resistance within a turn or so.
I've thought of doing similar but the servo's pot would be on my actuator
and the servo would be used like a gear motor to move the actuator. If you
wanted to get more control you could do something with a continuous servo
and feedback to an Arduino, the application I'm interested in involves an
airsoft gun aiming device, the arduino can be programmed to stop sending
pulses when no move command is being sent, that way the servo won't drift
and jump around from pot or electrical noise. The servos would turn screws
or worm & wheel to point the airsoft gun. The Arduino, or similar, approach
could be used to open the door to all kinds of possibilities even
controlling industrial servos, CNC machines, & Robotics from a hobby radio