force sensor control for servos

Costello:
that does sound like what I'm after. I had a look at the sweep example and I can see how it would be helpful for speed control. but what kind of command would make the arduino check the pressure after eCh increment ?

Something like:

   if(analogRead(sensorPin)<450)
      break;

The "break" statement will cancel the rest of a FOR or WHILE loop. The loop variable will be left set to the last value used.

int position:

void closeClaw() {
  int i;
  for (i = position; i < 180;  i++) {
    servoClaw.write(180);
    if(analogRead(sensorPin)<450)
      break;
  }
  position = i;
}