The newest integrated saw lines are benefiting from sophisticated multi-axis motion control. For example, the Veisto Group of Mantyharju, Finland, has totally automated the log breakdown process. The company’s compact sawing lines (Figure 1) are designed to perform all of the processing steps, from handling of raw logs through production of made-to-measure finished lumber, in a single processing pass. The lines typically consist of two or more sawing units, conveyers, and log positioners. They have integrated edging capabilities to square up log surfaces, so separate edging devices are not required. In addition to finished lumber, Veisto’s HewSaw product lines simultaneously produce top quality pulp chips.
A tightly integrated processing line such as the HewSaw system requires a lot of coordination between the sequential process stages. As described above, many motion steps need to be synchronized. Some of the more complex saw lines can involve several dozen motion axes that