Enhancements of force-torque map based assembly applied to parallel robots

This article presents the application and enhancements of assembly strategies using force-torque maps in view of parallel robots. Starting from classical assembly strategies the fundamentals of force-torque maps are briefly discussed. Taking up the core idea, a strategy for assembling objects by parallel robots is proposed, where frictional effects are reduced by an enhanced force and position control. Special attention is paid to acquisition of force-torque maps with respect to parameter sensitivity. Practical issues are pointed out and discussed in view of industrial applications. A quality assessment of force-torque maps based on a redundancy index is introduced hinting at the performance and possibilities of optimization of the assembly strategy.