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Calibrating unit – sanding workpieces to a consistent thickness
A calibrating unit removes material to produce a consistent workpiece thickness and prepare the surface for further sanding. It is a common working unit in wide-belt sanders from different manufacturers.
Operation and construction
A continuous abrasive belt is supported by a contact roller in the machining zone. As the feed system transports the workpiece, the belt machines its surface. The roller applies sanding pressure over a limited contact area.
Steel rollers or rubber-covered rollers of different hardnesses are used according to the application. Roller construction, abrasive belt and machine settings influence stock removal and surface finish. Multi-stage machines can have successive calibrating and sanding units.
Applications
Typical tasks include calibrating and preliminary sanding of solid timber, glued panels and suitable wood-based materials. Subsequent units can refine the surface using finer abrasive grits.
Application and classification
Calibration primarily targets dimensional accuracy. The unit configuration and grit sequence for subsequent fine sanding are matched to the required finish. The appropriate configuration depends on the material, initial condition and machining objective.
