Saw

The saw is a tool or a machine tool for cutting wood, natural stone, metal, plastic and other solid materials.

  • 4.1 Electrical stand saws
  • 4.2 Electrical handsets
  • 4.3 chainsaws

The Sägetechnik

The saw or blade consists of a thin, at the edge provided with chisel-like teeth, the linear steel plate or a circular saw blade, which is moved by a force. The saw tool with its saw teeth penetrate into the solid state and by removing thin shavings ( sawdust ) is incorporated a narrow groove and a parting line is formed. Depending on whether the blade is moved by hand or by machine power, a distinction is made between hand saws and machine saws (or sawing ). The saw is a tool -machined. A continuous movement of the saw teeth can be found for example on a circular saw and a discontinuous with respect to hand saws such as the fox tail.

To prevent jamming of the saw blade in the material, for example, in the wood, the cut must be wider than the blade. This is achieved by a corrugated, shrink or so-called ited blade. With a curved blade, the individual teeth are not sitting on a straight line, but run into gentle curves. Swaged teeth are wider at the tooth tip. At a geschränkten blade teeth are bent alternately to the right and left. Today is often found a mounting of saw blades with a different material, such as tungsten carbide (see Hartmetallsäge ) which is wider than the corresponding leaf.

If the saw teeth worn down, so they need to be sharpened a tedious and skill -requiring work. To ensure this a proper observance of the tooth pitch and tooth shape, it has introduced so-called behind -punched or perforated saws. These have the advantage that the file it significantly quicker going on over the saws full saw blade. They also have less friction, therefore less trembling ( shaking ) and less heating of the blade.

History

In Greek mythology, Perdix, the nephew of Daedalus is true, as the inventor of the saw.

Saw -like acting flints are in Europe since the Mesolithic in use. The saw metal originated in Egypt. The Roman crafts created a variety of saws that were not changed until the 14th century. As the saw came up from steel in the 15th century, it was used by loggers to replace the ax. Today there are only simple hand saws, as they have in some cases developed from the historical saws, and besides motor-driven stationary sawing machines, a variety of hand-held motor-operated sawing machines for a large number of special applications. To see scarf: scarf ( pre-and early history )

Roman saw blades from Vindonissa from the 3rd - 5th Century.

Handsaws

Hand saws have either a tense or lax blade.

Strained saws

The strained saws include:

  • The hacksaw
  • The frame saw: jig saw, Absetzsäge, slitting saw
  • The jigsaw
  • The Örtersäge ( in Austria called wide saw)
  • The Klobsäge

Tension free saws

Tension free saws are:

  • The Sachsensäge
  • Foxtail
  • The grooving saw (or scoring saw )
  • The hole saw
  • The jigsaw
  • The Bauchsäge (also crosscut saw, crosscut saw, blade saw, Trecksäge, Trummsäge, Waldsäge or Bauernsäge )
  • The ripsaw
  • The Japanese saw

Special shapes

  • The wire saw ( a sharp wire with two loops, which is moved around a branch to and fro)
  • Hand chain ( chain with two handles )
  • The serrated / e.g. used for domestic purposes. Bread and tomato knives.
  • Branch and tree saw, which can be performed both with cocked as unstressed saw blade

Special hand saws

  • Stretching saws: (will again in frame saws and hacksaws divided ) The frame saw consists of a blade, a web and a tension wire or a string line. The blade is connected at its two ends to the Sägearmen and is tensioned by rotation of the tensioning wire. The frame saws include: Schittersäge (DIN 7245, Form G )
  • Jig saw (DIN 7245, Form E )
  • Spannsäge (DIN 7245, Form C)
  • Absatzsäge (DIN 7245, form D )
  • Hacksaw
  • Jigsaw
  • Puksäge
  • Issue saws: these include the Feinsäge (DIN 7235)
  • Grooving saw
  • Tenon (DIN 7243)
  • Jigsaw (DIN 7258)
  • Veneer cutter
  • Foxtail (DIN 7244)

Sawing machines

  • Tischbandsägemaschine: intersects with an endless band saw blade
  • Circular saw ( table saw ) cuts with a circular saw blade. The same applies stone circular saws
  • Panel ( Tafelsäge ): for cutting boards with a circular saw running in a guide
  • Scroll Saw: for performing angular cuts
  • Reciprocating saw: a large sawing machine usually with multiple blades for cutting up tree trunks or cutting of large stone blocks into slabs
  • Drag Saw: Circular saw for sawing firewood

Electric stand saws

  • Band saw
  • Wire saw (in contrast to Drahtläppen for wafer production), wire saw
  • Tenon
  • Gang saw
  • Castcutter
  • Circular and annular saw
  • Reciprocating saw
  • Scroll Saw ( Electric fret saw )
  • Lifting or hacksaw

A special form of the saw is the Thermosäge that separates not machined, but melting. It is, for example, used for styrofoam.

Electrical hand tools

  • Circular Saw
  • Jigsaw
  • Schattenfug or false joint
  • Reciprocating saw
  • Hole Saw
  • Vibrationssäge
  • Twinsäge
  • Electric handsaw
  • Handbandsäge
  • Castcutter
  • Tenon

Chainsaws

Chainsaws with a saw chain:

  • The chainsaw i.e.S. with gasoline or electric motor Designs: Einmannsäge ( the well-known form); Zweimannmsäge; TopHandle saw, also Einhandsäge; Pruner ( with - mostly telescopic - handle); Abbundkettensäge ( Zimmermannssäge ); Ironing chainsaw ( crosscut saw ); concrete chain
  • Mining chain saw with pneumatic drive
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