ORIGINAL: Gray Beard
Different speeds from one servo to servo, sluggish reaction time, servo jumping, servos stop working, servos not working at all, servos not centering correctly, servo throws different.
That would make ALL servos highly unreliable devices indeed!
We would not be able to fly our planes at all.
The same signal goes to both servos connected to a Y.
The servos should be reacting exactly the same way... e.g. 1520uS is -ALWAYS- "center" for JR type servos and if I remember correctly 1520uS is always center for Futabas.
Likewise similar timings describe end point positions, 1000uS to 2000uS, both being travel extremes.
While the exact end point position may vary from manufacturer to manufacturer, identical servos should always react identically.
If you have the type of problems you described above, you have problems elsewhere... look to overly long cables, interference, or power issues.
Servo timing info for different brands: [link=http://www.ronlund.com/rcheli/HELP_SERVO_PULSE.html]Servo Pulse timing[/link]