Hole quality assessment in peck drilling

This paper evaluates the hole quality on Al 6061 aluminum alloy using peck drilling process. Specimens were drilled under dry conditions with HSS drill of 10 mm diameter. Peck drilling experiments were conducted in three steps of 10 mm each. Hole quality is checked by measuring the roughness (Ra) of generated surfaces. This roughness analysis indicates that new step in peck drilling has strong influence on surface roughness of previously drilled step. This work also suggests that step length and no of steps are important influential factors for surface roughness in peck drilling.