A flat metal sheet is fed into a machine, which then forms it into a cylindrical pipe using a series of rollers. The pipe is then cut to length by a saw, producing sparks.
Long ago, to join steel plates, workers would drill a hole in the metal, hammer in a red-hot rivet, and pound it into place. As the rivet cooled and contracted, it pulled the plates tightly together. But the more the plates vibrated, the looser the rivets became over time. People started wondering, could steel plates be joined without rivets at all
A machine tool is shown cutting internal splines or gear teeth into a metal part. Cutting fluid is applied as a broaching tool passes through the workpiece, gradually forming the teeth. The process creates a precise internal gear pattern.
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