A Novel On-Machine Measurement Method Based on the Force Controlled Touch Probe

Abstract

For free form surfaces such as blades, their measurement accuracy and efficiency depend on the planning strategy of discrete sampling points and the compensation precision of probe tip error. However, the force information is not considered in the traditional adaptive sampling and error compensation methods, which may affect the measurement efficiency and accuracy. In this paper, a novel force controlled touch probe for on-machine measurement system with a 5-DOF force/moment sensor is proposed. According to the projection of the force on cross section of blade, the proposed adaptive sampling algorithm can automatically select measuring points. Meanwhile, the direction of measuring force is used to estimate the compensation direction for probe tip error. The experiments are conducted on the on-machine measurement system, and the results demonstrate that the proposed methods are effective, which can provide important reference value for free-form surface measurement.