August 22 – 25, 2018

Georgia World Congress Center | Atlanta, GA| USA

Dual-line Rough Mill Processing
- The Practices and the Facts

Friday, August 26th from 2:00PM – 3:30 PM

Session Code: MFG12

Location: B303 (located in Building B - Level 3)

Presented by: Virginia Tech

Speakers: Urs Buehlmann, Professor: Virginia Tech and Ed Thomas, Research Computer Scientist: US-FS  

There has been much discussion in the wood products industry about dual-line rough mills, e.g., rough mills that are capable of either ripping or crosscutting a board first, depending on the best yield or the best parts to be obtained. Indeed, research has shown that dual-line processing increases yield in rough mills, thus supporting the notion that exists in the industry. However, very few mills exist that have dual processing capabilities. This workshop will discuss the concept of dual-line processing, show the evidence from scientific research on the practice, and discuss its benefits and examine why it is not used more frequently.

About the Speakers:  



Urs Buehlmann: Professor, Virginia Tech Department of Sustainable Biomaterials, focuses on manufacturing systems and on assessing industry competitiveness. Urs has given special focus to the impact of foreign competition on the wood products industry and its relationship with the U.S. housing market. He practices and promotes Lean Principles as a way to improve business results.

Urs has more than 15 years of experience working in industry, including serving as General Manager of Enkeboll Designs, Carson CA.



Edward Thomas received a BS in Computer Science from Concord University in 1988 and a master's degree in Computer Science from West Virginia University in 1993. Mr. Thomas began working for the USDA Forest Service in 1988. His research areas include simulation and modeling of rough mill systems and sawmills. He is the author of the ROMI rough mill simulation software allows users to specify their rough mill configuration including: ripsaw, chopsaw, panel options, prioritization, part sizes, part quality options, and lumber grade mix to perform a complete rough mill cut-up simulation. Simulation results detail the volume and number of boards required to satisfy the cutting bill requirements, as well as the number of strips, strip yield, part yield, and the number of ripping and chopping operations that were required. Small changes in grade mix, part sizes, and processing options can result in unpredictable changes to yield and processing results. Using simulation allows users a way to experiment with their rough mill operations to determine the most efficient processing methods before cutting a single board. Mr. Thomas is currently conducting research that examines the relationships among internal defects and external indicators on hardwood logs.