Effect of repetition in micro scale pin-hole interference fit

The purpose of this study was to establish an interference tolerance for micro-scale pin-hole assemblies. Although a few existing studies discussed micro pin-hole assemblies, most of them are on the assembly system or onetime assembly. In the present research, the effect of repetition on pin-hole interference fits was investigated. And an analytical model that describes the results was presented. Pins and holes were fabricated from tungsten carbide and aluminum plate, respectively. The insertion and extraction forces, which are important factors in tolerance decisions, were measured using a designed assembly system with a dynamometer. The deformation of the hole surface after the first pin insertion was also observed.