Senior Design 2020 – Mechanical Engineering Team 8
Mechanical Engineering Team 8
Benjamin Bonvicini Patrick Gorman Edwin R Roman Jr.
Thomas J Mealy
Vertical Mill for New Product Production
Chapman Manufacturing is an American made company that creates hand tools for industry assembly, commercial services, and for precisionists. Located in Durham, CT, Chapman has been in service for over 80 years and prides themselves with manufacturing as many of their products in house as possible. Team ME08 was tasked with determining the best way to manufacture the body of a new palm ratchet and an insert for a new midget ratchet. Chapman manufacturing currently has no way to manufacture these products in house, so ME08 set out to compare automating a bridgeport machine already owned by Chapman with purchasing a new 3 axis CNC machine. Using financial analysis, production metrics, and manufacturing parts using each method, ME08 determined that purchasing a 3 axis CNC, specifically a Tormach 770MX, would be the best method for Chapman to manufacture the new products. The CNC machine was able to produce the same ratchet piece in one tenth of the time as the Bridgeport and produced a cleaner milling finish. The existing Bridgeport was limited by its spindle speed and the fact that it could only be automated in the X and Y axis directions, with the Z axis still needing to be manually controlled. Following the selection of manufacturing method, ME08 used a CNC to produce a functional prototype ratchet.