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Encyclopedia > Band saw
A bandsaw in use
A bandsaw in use

A bandsaw (often spelled band saw in the US) is a saw that can be used for woodworking, metal working, and a variety of other materials. It gets its name from its blade, consisting of a narrow band of toothed metal. This band rides on two wheels in the same vertical plane with a space between them. Band saws are particularly useful for cutting irregular shapes. The radius of a curve that can be cut on a particular saw is determined by the width of the band. Image File history File links Metadata No higher resolution available. ... Image File history File links Metadata No higher resolution available. ... United States may refer to: Places: United States of America SS United States, the fastest ocean liner ever built. ... Artists can use woodworking to create delicate sculptures. ... Metalworking is the craft and practice of working with metals to create parts or structures. ...

Contents

Metal Cutting Band Saws

When cutting metals, special band saws are required that include coolant pumps which provide a constant flow of liquid coolant over the blade. The coolant keeps the blades cool, which adds blade life. They also include a powered wire brushwheel to remove chips and buildup from the blade as it exits the material. Metal cutting band saws are available in vertical and horizontal designs. These units range from manual to semi-automatic and even automatic controls.


Machine shop bandsaws are horizontal, vertically cutting saws. Small, manual shop saws usually employ a gravity-fed blade that falls in an arc around a pivot point. The rate of descent is controlled by a shock absorber that has an adjustable rate. When a manual saw is set up for another cut, the operator raises the saw by hand and leaves it in a 45 degree position. The material is unclamped, moved up to hit the part stop (which is then moved out of the way), material reclamped, and the operator hits the rapid advance switch to lower the saw just before the cut begins. The saw's piston is then set to cut advance, and another cut is made.


Additional common equipment on machine shop saws include

  • A part stop for repeatable billet production, allowing long rods or bars to be cut into the correct billet size
  • A long roller bed to assist long and heavy stock feeding
  • Vices along the roller bed to ensure setup rigidity
  • Miter base that allows angled cuts
  • Saw braces that are adjusted to present just enough exposed saw to cut through the work. This increases rigidity and life of the blade.

Feed Mechanisms

Large resaw blades used in a sawmill.
Large resaw blades used in a sawmill.

Machine shop saws Image File history File links Download high resolution version (1600x1067, 246 KB) Band saw blades File links The following pages link to this file: Sawmill Band saw ... Image File history File links Download high resolution version (1600x1067, 246 KB) Band saw blades File links The following pages link to this file: Sawmill Band saw ... For the 1922 film starring Oliver Hardy, see The Sawmill. ...

  • Gravity feed saws fall under their own weight against a shock absorber in the saw base. Common in small saws.
  • Hydraulic feed saws use a positive pressure hydraulic piston to advance the saw through the work. Common in production saws.
  • Screw feed employ a leadscrew to move the saw.

Fall Mechanisms

  • Pivot saws hinge in an arc as they advance through the work.
  • Single Column saws have a large diameter column that the entire saw rides up and down on, very similar to a radial drill.
  • Dual column saws have a pair of large columns, one on either side of the work, for very high rigidity and precision. The dual column setup is unable to make use of a miter base due to inherent design. Dual column saws are the largest variety of machine bandsaws encountered, to the point where some make use of a rotary table and X axis to perform complex cutting.

Automated saws

Automatic bandsaws feature preset feed rate, return, fall, part feeding, and part clamping. These are used in production environments where having a machine operator per saw is not practical. One operator can feed and unload many automatic saws.


Some automatic saws rely on NC/CNC control to not only cut faster, but to be more precise and perform more complex miter cuts.


Large band saws

Timber mills use very large band saws for ripping lumber; they are preferred over circular saws for ripping because of their smaller kerf (cut size), resulting in less waste. Invented in England in 1780, the circular saw (also known as the buzz saw in the USA) is a metal disc or blade with saw teeth on the edge as well as the machine that causes the disk to spin. ... Kerf is the name given to the cut that a saw makes. ...


The blades range in size from about (4" wide x 19' long x 22 ga thickness) to (16" wide x 62' long x 11 ga thickness). The blades are mounted on wheels with a diameter large enough not to cause metal fatigue due to flexing when the blade repeatedly changes from a circular to a straight profile. It is stretched very tight (with fatigue strength of the saw metal being the limiting factor). Band saws of this size need to have a deformation worked into them that counteracts the forces and heating of operation. This is called benching. They also need to be removed and serviced at regular intervals. Sawfilers or sawdoctors are the craftsmen responsible for this work. Sawfiler benching a double cut saw A sawfiler is a person who maintains and repairs saws in a saw mill. ...


The shape of the tooth gullet is highly optimized and designed by the sawyer and sawfiler. It varies according to the mill, as well as the type and condition of the wood. Frozen logs often require a frost notch ground into the gullet to break the chips. The shape of the tooth gullet is created with a grinding wheel. The sawfiler will need to maintain the grinding wheel's profile with periodic dressing of the wheel. Look up sawyer in Wiktionary, the free dictionary. ... Sawfiler benching a double cut saw A sawfiler is a person who maintains and repairs saws in a saw mill. ...


Head saws

Head saws are large band saws that make the initial cuts in a log. They generally have a two to three inch tooth space on the cutting edge and sliver teeth on the back. Sliver teeth are non-cutting teeth designed to wipe slivers out of the way when the blade needs to back out of a cut. A head saw, gang saw or head rig, is the saw that makes the initial cuts in a log at a sawmill, turning a log into cants, or planks, of wood. ...


Resaws

A resaw is a large bandsaw optimized for cutting timber along the grain to reduce larger sections into smaller sections or veneers. Resawing veneers requires a wide blade - commonly 2" to 3" (52 - 78 mm) - with a small kerf to minimize waste. Resaw blades of up to 1" (26 mm) may be fitted to a standard bandsaw. Resaw blades used in a sawmill. ... A veneer is a thin covering over something. ... Kerf is the name given to the cut that a saw makes. ...


Double cut saws

Double cut saws have cutting teeth on both sides (see sawfiler for a picture of a very small double cut). They are generally very large, similar in size to a head saw. Sawfiler benching a double cut saw A sawfiler is a person who maintains and repairs saws in a saw mill. ...


See also

For other uses, see Chainsaw (disambiguation). ... Invented in England in 1780, the circular saw (also known as the buzz saw in the USA) is a metal disc or blade with saw teeth on the edge as well as the machine that causes the disk to spin. ... Sawfiler benching a double cut saw A sawfiler is a person who maintains and repairs saws in a saw mill. ...

Safety Information

  • Band Saw Safety Procedures]

References

  • Mark Duginske (1989). The Bandsaw Handbook. Sterling Publishing. ISBN 0-8069-6398-0

  Results from FactBites:
 
Band Saw (0 words)
Turn the saw on and start to make your cut, if the curve is too sharp you may need to make relief cuts to allow for clearance.
Because the blade on the band saw is one continuous blade and for the speed that it goes the follow hazards exist.
Make all adjustments with the saw turned off, and unplugged in cases where the blade is or could be touched.
  More results at FactBites »

 
 

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