I'm looking for ideas on cabling a sensor that is undergoing cyclic motion in a way that will avoid fatigue failures in the cable.
The sensor is an accelerometer mounted on a shaft that rotates through ~375 degrees and back at about 15-60 RPM. The shaft is around 100mm diameter. It might go through ~250,000 cycles in the sensor life. It's okay for the cable to fail if it goes through more than 375 degrees. What's the best type of cable to use so that the repetitive winding and unwinding won't cause failures?
Bonus points if the solution is (a) cheap, and (b) avoids lots of slack cable flapping around.
Alternatively, anyone with good ideas on how to accurately measure the motion of a church bellis welcome to put them forward. By "accurate" I mean better resolution than 0.5 degrees in the motion of the bell, bonus points for measuring angular acceleration directly.