Hacksaw

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A hand hacksaw

A hacksaw (also: bow saw) is characterized by the saw blade clamped in a U-shaped, downwardly open bracket and the back and forth movement.

function

Hacksaws are available as both hand and machine saws. The advantage of the hacksaw is that the saw blade can be very thin, which reduces the material to be machined (cutting width) and thus also the machining work . The tension between the legs of the bracket keeps the saw blade taut. An equally narrow blade saw would buckle, unless it is only pulled , as with the two-man tree saw or the Japanese saw .

Since the bracket is thicker than the saw blade for reasons of stability, the height of the bracket limits the thickness of the workpiece to be sawed. The cutting movement can run in both directions, whereby a stroke is always executed as an idle stroke (dead stroke). Therefore, only half of the working time can be used productively, which is an advantage for continuously working sawing processes, such as band saws . Materials that are difficult to machine can be machined using curved strokes (broaching cut), as there are always only a few teeth in contact here. The saw is not moved straight back and forth, but in an arc shape. Hacksaws with metal hoops usually have a quick release lever and a device for adjusting the blade tension.

Hacksaw
Woodworking
Typical hacksaws for woodworking are the fretsaw and the pruning saw .
Metalworking
The hand hacksaw and machine hacksaw are typical for metalworking . The small metal hacksaw is used for smaller jobs, with the handle and handle made from the same metal wire. For precise work, the goldsmith uses a hacksaw that looks similar to the fretsaw.

  • Hand hacksaw

  • small hand hacksaw

  • Goldsmith saw

Machine operated hacksaw

Electrically operated hacksaw

A machine-operated reciprocating saw or hacksaw is operated by a motor and a gearbox that converts the rotary movement into forward or backward thrust. Almost all materials can be cut with such a saw, mostly bar material, profiles or tubes. When sawing metal, cooling liquid is usually supplied via a hose , which cools the saw blade and the workpiece.