Bandmill Strain System Response

The responsiveness of the strain system of a bandmill is a critical factor for bandsaw performance and maintenance. The strain system applies the force, usually through the top wheel, that pulls that blade tight and gives the blade its stiffness. This paper discusses some experimental measurements of the movement of the top wheel during operation, and the implications related to design and maintenance. Strain System Functions The strain system, or top wheel assembly, has three functions: 1. Provide enough movement of the top wheel to change blades. 2. Apply the strain force to the blade. 3. Allow the top wheel to move as the blade length changes. but effectively still maintaining the same strain. Strain, guide position and blade thickness are the threc main factors that affect blade stiffness. The tighter the blade is pulled, the stiffer it will become. Strain also affects the tracking stability of the band on the wheels. The feed force bends the blade back during cutting. causing the band to track backwards. The more the blade bends the faster it moves on the wheels, so increasing th