How do you measure a PTO drive shaft correctly?

Question

As much information as possible please!

Answer 1

PTO SHAFT TORQUE TRANSDUCER

The PTO torque is measured by a special made PTO shaft torque transducer that is located between the tractor  PTO and the implement PTO input.  The design of the transducer is based on the modification made on the standard  commercial PTO tractor drive shaft.  The free end of the female PTO drive shaft is provided with a raised collar, a s***w bracket and a lock nut to position a 9E06-S1-3B NEC slip ring while the other end is welded to a universal joint.  Two sets of KFG-5-120-D16-11-L1M-2S Kyowa,  90o rosette, 120+0.8 Ohm, 2.1 gauge factor strain gauges are bonded at 45 degree shear planes on opposite sides of the circumferential outside surface of the female PTO drive shaft.  The bonded strain gauges on the female PTO drive shaft are connected in a full bridge configuration.  A 2.5 mA  constant current excitation source is supplied from the data logger to the shaft transducer via the slip ring.  The shaft transducer is designed for a torque range of 0  to 937 Nm and sensitivity of 0.2852 mV/V/Nm.

Answer 2

If you're measuring the overall length, measure from tip to tip when the shaft is fully collapsed. When measuring centerline length, measure from the center of the universal joint to the same point on the other end. If you need to determine the universal joint size, you will need to know the cap diameter and the cap to cap length of the joint.