Roll Neck

[Bo Murdock]

  I’m working on the roll neck by using the master/slave configuration on the servos similar to the stomach servos master/slave configuration.  I’ve been successful creating the slave/master configuration for stomach, I’m having a problem where both paired roll neck servos are synced at start, but the slave servo becomes out of sync with the master servo.

  I’ve tried creating the master/slave wiring configuration using a pair JX PDI-6221MG as well as a pair of Tower Pros MG996R servos with out any luck.  After rolling left to right and right to left the slave servo becomes out of sync with master servo.

Any ideas as to why the slave servo for roll neck becomes out of sync?

Thanks,

Bo