Definition
A power-driven cutting tool with a flat, round blade whose teeth are arranged around the rim. The blade rotates at high speed and cuts through material as it is fed into the work. In aviation maintenance, circular saws are used to cut sheet metal, aluminum stock, plastics, and other airframe materials, with the blade type matched to the material being cut.
Plain English
A power tool with a spinning round blade that cuts through metal, wood, or plastic as the blade is pushed into the material.
Context Anchor
Seen in aircraft maintenance and shop work when cutting sheet material, wood forms, panels, or other repair materials.
Derivation
Named for the shape of the blade — a circle — and the cutting action of a saw. The word 'saw' traces back to Old English 'sagu,' meaning a cutting tool with teeth.
Why Pilots Care
Using the wrong blade or forcing the cut can damage the material, overheat the blade, or create an unsafe shop condition during aircraft maintenance work.
Intuition Check
Do not assume a circular saw is only for wood. In maintenance use, the blade and speed must be suitable for the material being cut.
Example Sentence 1
The mechanic used a circular saw with a fine-tooth blade to cut the aluminum sheet to the size shown on the drawing.
Example Sentence 2
Always check the blade guard and depth setting on the circular saw before making any cut on shop stock.