Hello,
In my next project i want to use a servo 360 grades to turn a platform in 4 differents stations each 90 grades. In the platform there will be a group of sensors. My idea is to take different measurements of the sensors with the servo. Which is the best way to do it ?
pep-f:
In my next project i want to use a servo 360 grades to turn a platform in 4 differents stations each 90 grades. In the platform there will be a group of sensors. My idea is to take different measurements of the sensors with the servo. Which is the best way to do it ?
A stock servo has absolute positioning sensing only up to about 180 deg.
There are 'continuous rotation' modifications, but you lose the position sensing.
There are mods for 'several turns of absolute position sensing' using a multiturn pot, but not fully continuous.
So the Q is do you mind 'rewinding' the table after a full 360 turn? If yes then you can have absolute precision sensing fairly easily.
If you can't or don't want to rewind the table then I think you need a stepper motor.
If you want to stick with the servo -with- continuous rotation you -can- add another external sensor to detect position, but that's a bunch more parts and work. The amount of work and difficulty will depend on what kind of precision you need.
Motors are graded by power and speed. Selection is going to depend on how much the table you're turning weighs, and how fat you need to turn it. A lot of weight isn't hard to turn by a servo, but it's not necessarily easy to -stop- (momentum.) See the recent posts about jitter. Picking the right motor is a more purely mechanical engineering topic and except for eyeball guesstimations a little out of my league.
How about a 180° servo and 1:2 gearing?
A sail-winch servo has position control over about 3 revolutions.
...R
Here's a 360 degree servo. Metal output gear too.
Thank's guys. I will check all this types of servos.
Really appreciate your help !