| I have been told a few times (and read on the net) that r/c servo's wont
| last when used extensively.
I suspect that this is true. But have no personal experience with it.
| Some data:
| Continous load = 12 N/cm, this load will be continous, 24/24.
Actually, the correct units would be 12 N*cm, not 12 N/cm. (torque =
force * distance.) I realize that this is little more than a
nit-pick, but the difference may very well trip you up when you
convert from the oz-inch figures that most servo manufacturers give in
cm = 17 ounce*inch, which is pretty small. Even a standard $8
servo could easily handle this, but it's not meant to do it 24/7 so I
don't know how long it would take to burn out. Probably not long.
Your best bet would be to get a servo that can create MUCH more torque
than you need, perhaps one that's been modified for extreme torque and
slow speeds? Using things like this --
sounds good. The gearing would reduce the load on the motor.
Digital servos can generally provide more torque than an equvilently
sized standard servo, but I don't know if they'd stand up to constant
use any better or any worse.
| This force will be rotational, so no force from the side, other then
| the gears inside the servo (on the output shaft). Resolution
| used/required = 180 degrees in 100 steps ( precise ). Environment:
| Will be used in a device which will go all over the world. Expected
| conditons are like on a containership, so salty air might have
| influence, so does humidity, cold, warm, dry. Device wil not get
I'd seal every possible point that it could leak with silicone seal if
at all possible. You say it won't get wet, but even salt air can be
bad on anything electronic.
| Been thinking of using a water sealed, dual bearing, non-metal gear type,
| with 2 or 3 times the torque rating required.
I'd go for 20x + the torque rating required. Our servos are meant to
run for a few seconds at a time. Running for days at a time, I'll bet
they wouldn't even last a single day (perhaps not even an hour), even
running at 1/2 capacity.