It discusses the influence of ground control network, underground traverse survey, shaft orientation and gyroscopic orientation edge append-survey on breakthrough precision.

Features: use pneumatic landscape orientation pressurization, press commutator into rotor shaft, can exactly aim at rotor slot and commutator, tooling changing conveniently.

In this paper, a three-dimensional photoelastic experiment was presented for studying closed var-ied-orientation transmission shaft, being made of materials with various modulus of elasticity.