About Us

The DuPage Machine Products Story

Our Commitment to Excellence

A Letter from Our President


DuPage Machine Products is committed to supplying quality products to our customers, while providing a safe and clean work environment for our employees in a modern, state-of-the-art manufacturing facility.

Our continued commitment to acquiring the latest technology in the industry today, combined with well-trained and committed employees, positions us as a leader in the precision turned products industry.

Our wide range of capabilities allows us to produce the most complex parts — complete to print. In addition, our ability to design and produce all our tooling in-house provides us flexibility and the ability to deliver quality products, on time.

I want to thank you for visiting our website. Whether you are a potential new customer or a prospective new employee, I want to assure you that we will do everything possible to exceed your expectations and satisfy your needs. We are proud of our extraordinary commitment to service.


David R. Knuepfer


DuPage Machine News Articles

A lot is happening at DuPage Machine Products! Read about changes to our company, facility, products and processes. And discover how our quality parts, machining expertise, commitment to the latest technology and dedication to excellence have been helping our clients succeed for nearly a century.

Our Commitment to the Industry

There is no company or family more committed to the machining industry than DuPage Machine Products. Our owners go back three generations in the machining industry.

Our first-generation owner, Claude Knuepfer, founded General Engineering Works in 1923. Claude was also a founding member of the Screw Machine Products Association at its inception in 1923 and its formal introduction as the National Screw Machine Products Association (NSMPA) in 1933.

Second-generation owner Bob Knuepfer founded DuPage Machine Products in 1969 and was also a founding member of the Alliance of Metalworking Industries (AMI) in 1974. This coalition banded together five similar trade associations with common goals to attain the leverage necessary to be heard in Washington, D.C.

With changes in machining technology and the industry’s move toward processes not traditionally associated with automatic screw machines, the decision was made to change the name of the NSMPA to the Precision Machined Products Association (PMPA) in 1995. Second-generation owner Bob Knuepfer and third-generation owner Dave Knuepfer Sr. both served as past presidents of PMPA.

DuPage Machine Products is currently experiencing its fourth generation of commitment through the combined efforts of Dave Knuepfer Jr. and William Knuepfer, both of whom have also been heavily involved in PMPA leadership activities.

With your help, we plan to maintain our dedication to the machining industry and to the manufacturing of high-quality components for generations to come!