lisäpoistoa

Lisäpoistoa is a term used in Finnish manufacturing and machining to denote the additional removal of material performed after the initial shaping or rough machining in order to achieve the final dimensions, tolerance, and surface quality of a workpiece. It may be planned as part of the finishing stage or carried out as corrective work when measurements show shortfalls or unevenness. The concept applies across metalworking, woodworking, plastics fabrication, and other material-removal disciplines.

In practice, lisäpoistoa involves removing small amounts of material in successive passes until the target geometry and surface finish are achieved. Common methods include milling, turning, grinding, sanding, filing, and deburring, depending on the material and required tolerances. Finishing passes are typically lighter than roughing passes and may be performed with finer tools or abrasives. In CNC operations, finishing passes are programmed to execute controlled reductions of material.

Key considerations include understanding the original stock allowance, desired final dimensions, and tolerance stack-up. Accurate measurement and inspection are essential, with tools such as calipers, micrometers, height gauges, or coordinate measuring machines. Excessive lisäpoistoa risks removing too much material, compromising strength or fit, while too little may leave unacceptable deviations. Tool wear, dimensional drift, and fixture stability should be monitored to plan appropriate pass sequences.

Applications span mechanical parts, automotive, aerospace, and woodworking where precise finishing is necessary to meet specifications and ensure proper assembly.