The oscillating blade does not clear swarf in the same way as a rotating blade, so it is necessary to move the tool back and forth to allow accumulated sawdust to clear from the cutting area. The saw blade attachments use the angle of oscillation in the same way, particularly the circular-shaped saw used in hospitals to cut the orthopedic plaster used in cases of bone fracture, once the immobilization time is over. The increased friction is particularly apparent with the triangular sanding and grinding attachments which allow the operator to reach into corners and confined spaces, a feature unique to this type of power tool. The angle of oscillation creates increasing friction further from the center of the tool as these areas travel a greater distance.

The narrow angle of oscillation allows for precise control over the tool as it does not kick like a rotating or reciprocating tool can. This creates friction with the sanding attachments, or rapid cutting motions with the saw and grinding attachments. The accessory is fitted to the tool by a mechanism which allows that accessory to be rapidly rotated back and forth (oscillated). A small sliver can be easily removed from timber cut too long for a perfect fit. Small and precise cuts are possible even on end grain. The ability to cut a complex or precise recess without the need to remove the work piece from where is it fixed greatly increases productivity. The small form of these tools and the ability to mount the blade or accessory in any orientation allows cutting in areas that are otherwise virtually unreachable. This is particularly useful when fitting flooring along a skirting board, cutting the skirting to allow the board to slide under for a neat finish. Use of an offset in a fitted blade allows the tool to cut flush with a surface. The plaster cast saw formed the basis of FEIN's range of sophisticated oscillating power tools.

The plaster cast saw was equipped with a more powerful gearbox to upgrade it to a chassis saw. The crescent pattern of the oscillating rotation cut through the hard cast without damaging the patient’s skin. It was used primarily in orthopaedics for cutting plaster casts. This saw was patented as a circular saw with an angular oscillating saw blade. This type of oscillating tool was originally developed by the German manufacturer Fein in 1967 with a design intended to remove plaster casts easily without cutting the patient. Elektrische Gipssäge, a cast saw by Ortopedia, Kiel, Germany

Mount and blade tools