The objective of this research is to explore and develop a new methodology for computing carbon weight (CW) - often referred to as carbon footprint, in manufacturing processes from the part level to assembly level. In this initial study we focused on machining operations, specifically turning and milling, for computing the CW. Our initial study demonstrates that CW can be computed using either actual process level measured data or from initial material and manufacturing process information. Mechanical tolerancing principles are applied for computing worst case and statistical case CW of a product. We call this the CW Tolerance Approach (CWTA). Worst and statistical case allocation methodology for CW is also proposed. Two case studies demonstrate the computation CW. Based on tolerance allocation concepts; CW allocation is also demonstrated through specific redesign examples. A methodology for redesign based on CW allocation is suggested in this paper with the issues for future research.
Citation: NIST Interagency/Internal Report (NISTIR) - 7560
NIST Pub Series: NIST Interagency/Internal Report (NISTIR)
Pub Type: NIST PubsReport Number:
carbon weight (CW), manufacturing process, mechanical tolerancing, machining operations