Process-based tolerance assessment of connecting rod machining process


1 Department of Mechanical Engineering, GMR Institute of Technology, GMR Nagar, Rajam, 532127, Andhra Pradesh, India

2 Department of Mechanical Engineering, Centurion University, Parlakhemundi, 761211, Odisha, India

3 Department of Industrial Engineering, GITAM Institute of Technology, GITAM University, Visakhapatnam, 530045, Andhra Pradesh, India


Process tolerancing based on the process capability studies is the optimistic and pragmatic approach of determining the manufacturing process tolerances. On adopting the define–measure–analyze–improve–control approach, the process potential capability index (C p) and the process performance capability index (C pk) values of identified process characteristics of connecting rod machining process are achieved to be greater than the industry benchmark of 1.33, i.e., four sigma level. The tolerance chain diagram methodology is applied to the connecting rod in order to verify the manufacturing process tolerances at various operations of the connecting rod manufacturing process. This paper bridges the gap between the existing dimensional tolerances obtained via tolerance charting and process capability studies of the connecting rod component. Finally, the process tolerancing comparison has been done by adopting a tolerance capability expert software.