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Combination unit – calibration and fine sanding in one unit
A combination unit incorporates a contact roller and a sanding pad or pressure beam within one abrasive-belt unit. It combines different sanding tasks in a compact configuration and is used by various wide-belt sander manufacturers. Kombi and Combi describe the same basic principle.
Operation and construction
The contact roller supports machining with concentrated sanding pressure, for example during calibration. The sanding pad supports the belt over a larger area, principally for uniform surface processing and fine sanding.
Designs vary in their contact rollers and may use continuous or segmented sanding pads. Suitable control systems allow pressure elements to adapt to the workpiece area. Available functions depend on the unit configuration.
Applications
Combination units process solid timber and wood-based materials. Suitable equipment also permits veneer sanding and sanding between finish coats. The unit may operate alone or follow calibrating or planing units.
Application and classification
The roller and pad in a combination unit share one abrasive belt. Different grits in a single pass require additional belt units. Abrasive grit, sanding pressure and feed speed are matched to the material and required result.
