bandsaw (also written band saw ) is a saw with long, sharp blades consisting of continuous toothed metal ribbons that extend between two or more wheels to cut the material. They are used mainly in woodworking, metalworking, and sluggish, but can cut various materials. Benefits include uniform cutting action as a result of evenly distributed teeth, and the ability to cut irregular or curved shapes like jigsaw. The minimum radius of the curve is determined by the width of the band and the scratches. Most bandsaws have two wheels that spin in the same plane, one of which is powered, although some may have three or four to distribute the load. The blades themselves can come in various sizes and pitches of teeth (tooth per inch, or TPI), allowing the engine to be extremely versatile and capable of cutting a wide variety of materials including wood, metal and plastic.
Almost all bandsaws are currently powered by electric motors. The shaft line version was once common but is now antiques.
Video Bandsaw
Histori
The bandaw idea dates back to at least 1809, when William Newberry received an English patent for the idea, but bandsaws remained impractical primarily due to the inability to produce accurate and durable blades using today's technology. Constant flexing of the blade on wheels causes either material or welding together to be a failing loop.
Almost 40 years passed before France Anne Paulin Crepin designed the welding technique to overcome this obstacle. He applied for a patent in 1846, and soon after that sold the right to hire it to producer A. Perin & amp; The Paris company. Combining this method with new steel alloys and advanced tempering techniques allows Perin to create the first modern bandsaw blade.
The first American bandaw patent was awarded to Benjamin Barker of Ellsworth, Maine, in January 1836. The first manufactured and commercially available bandaw manufacturer in the US was design by Paul Prybil.
Power hacksaws (with reciprocating knives) were once common in the metalworking industry, but bandsaw and cold saws have largely replaced them.
Maps Bandsaw
Type
Housing and light industry
Many workshops in the garage of houses or dungeons and in light industry contain small or medium sized bandsaws that can cut wood, metal, or plastic. Often a general purpose knife is abandoned, although the optimized blades for wood or metal can be replaced when the volume of warrants is used. Most residential and commercial airports are of vertical type mounted on a bench or standing cabinet. Versions of portable power tools, including cordless models, are also common in recent decades, allowing building contractors to bring them together in trucks to work.
Meat cut
Chainsaws for meat cuts are usually of all stainless steel construction with easy to clean features. The blades have good teeth with hot-treated tips, or have a plain or toothed blade edge.
Metal fabrication shop and machine shop model
Bandsaw is dedicated to the use of industrial metal cutting, such as for structural steel in fabrication stores and for stock bars in machine shops, available in vertical and horizontal designs. Typical ribbon speeds range from 40 feet (12 meters) per minute to 5,000 feet (1,500 meters) per minute, although special bandsaws are made to cut hard metal friction and run the tape speed of up to 15,000 feet per minute. Bandaw cutting metal is usually equipped with a brush or brush to prevent chips sticking between the teeth of the blades. The system that cools the blades by cutting the fluid is also a common tool on metal cutting bandsaw. Coolant wash the swarf and keep the blade cool and lubricated.
The horizontal band holds the workpiece while the blade swings down through the cut. This configuration is used to cut long material such as pipe or stem rod to length. Thus it is an important part of the facility in most machine shops. Horizontal design is not useful for cutting curves or complicated shapes. Small horizontal bandwidths typically use only gravity feed, retarded to levels that can be adjusted by coil springs; in industrial models, the rate of decline is usually controlled by hydraulic cylinders flowing through the adjustable valve. When the saw is mounted for cutting, the operator lifts the saw, positioning the material to be cut under the blade, and then turns the saw. The sword slowly drops into the material, cutting it off as the blade moves the band. When the piece is finished, the switch will be tripped and the saw will automatically shut off. More sophisticated versions of this chainsaw type are partially or completely automated (via PLC or CNC) for high volume cuts from empty machines. Such a machine provides the recycled liquid stream from the refrigerant tank, in the same manner as the CNC machining center.
A vertical bandsaw, also called a contour chainsaw, makes the blade path remain stationary while the workpiece is moved through it. This type of saws can be used to cut complex shapes and corners. The part may be incorporated into the blade manually or by a power assist mechanism. This type of metal-cutting bandsaw is often equipped with a built-in blade welder. This not only enables the operator to repair damaged blades or make new blades quickly, but also allows the knife to cut intentionally, directed through the center, and welded back to make interior pieces. These saws are often equipped with a built-in air blower to cool the blades and blow the pieces off the cut area so the operator can see the job clearly. This type of saws is also built in wooden versions. Woodworking type generally has a lighter construction and does not use the power feed mechanism, cooler, or welder.
Progress has also been made in the blades used to cut metal. Bimetal blades with high-speed steel teeth, including grade cobalt, are now the norm. The development of new dental geometries and tooth throws has resulted in increased levels of production and greater blade life. New materials and processes such as M51 steel and cryogenic knife treatments have produced results considered impossible only a few years ago. New machines have been developed to automate the welding process of saw blades as well.
Wood cutting
The timber mill uses a very large band to tear wood; they are preferable to circular saws for tearing because they can hold large diameter wood and because of their small scratches (cut size), produce less waste.
There is also a small portable sawmill consisting of a store-sized saw that is mounted on the guiding table, called a bandaw factory (sawmill factory, band saw). Like chainsaws (chainsaws on the guide desk), they can be used cheaply by one or two people in the field.
In a full-size sawmill, propellers mounted on wheels of considerable diameter do not cause metal fatigue as it stretches when the blades repeatedly change from circle to straight profile. It is stretched very tight (with the tired strength of the saw metal being the limiting factor). These sized Bandsaws need to have deformations that work into those that resist strength and heating operations. This is called "benching". They also need to be removed and serviced on a regular basis. Sawfilers or sawdoctors are the craftsmen in charge of this work.
The form of the esophagus is greatly optimized and designed by sawyer and sawfiler. It varies according to the factory, as well as the type and condition of the wood. Frozen stalks often require ground "dew ice" into the esophagus to break the chips. The form of the esophagus is made when a knife is made and the shape is automatically maintained with each sharpening. The saws will need to maintain the profile of the grinding wheel with a wheelbase periodically.
Proper blade tracking is essential for accurate cuts and greatly reduces blade damage. The first step to ensure good tracking is to check if two jumpers or jumper are co-planar. This can be done by placing a straight line in front of the wheel and adjusting until each wheel touches. Rotate the wheel with the knife in position and tighten it properly and check if the tracking is correct. Now install the blade guiding roller and leave the gap about 1 mm between the back of the blade and the guide flange. The knife teeth that have become narrow through repeated sharpening will contaminate the front edge of the guide rollers because they scratch the set and force the knife to be misaligned. This can be fixed by cutting a small step on the front edge of the roller to accommodate the protruding tooth. Ideally rollers should be crowned, (see belt_and_pulley_systems) configuration that helps in tracking the right band and belt, at the same time allowing cleaning for the set of teeth.
Chainsaw
The head saw is a large saw that makes early cuts on a log. They generally have 2 to 3 deep (51 to 76 mm) tooth spaces on the cutting edge and sliver gear behind. Teeth Sliver is a non-cutting tooth designed to wipe the slivers out of the way when the blade has to come back out of the wound.
Resaws
A resaw is a large bandsaw that is optimized to cut wood along the grain to reduce larger parts into smaller parts or veneers. Veneer resawing requires a wide knife - generally 2 to 3 deep (51 to 76 mm) - with small scratches to minimize waste. The resolung blades up to 1 inch (25 mm) can be plugged into a standard bandsaw.
Double cut saw
Double cut saws have cut teeth on both sides. They are generally very large, similar to the size of a saw blade.
Construction
Feed mechanism
- Gravity feedback the saws fall under its own weight. Most saws have methods to allow cutting forces to be adjusted, such as moving weight balancing, coil springs with screw thread adjustments, or hydraulic or pneumatic dampers (speed control valves). The latter does not force the blade down, but only limits the saw speed to fall, preventing over-giving on thin or soft parts. This is analogous to hardware closer to a door whose actions prevent the door from slamming. General gravitational feed design in small saws.
- Hydraulic baits saws use positive pressure hydraulic pistons to advance the chainsaw through work at pressure and variable rate. Usual in the production of saws.
- Screw feed saws using lead lever to move the saw.
Fall mechanism
Chainsaw- Pivot depends on the arch as they progress through the work. The
- single column has large-diameter columns that are all up and down, very similar to a drill machine. Saws
- Double columns have a pair of large columns, one on either side of the job, for stiffness and very high precision. Multiple column settings can not use partner basis due to inherent design. Double-saws are the largest variety of machine ribbons encountered, to the point where some use turntable and X axis to make intricate cuts.
Automatic saw
The tapes automatically display the predefined feed level, return, fall, feed the part, and clamp the part. This is used in a production environment where having a sawmill operator is not practical. One operator can feed and dismantle many automatic saws.
Some automatic saws rely on numerical controls to not only cut faster, but more precisely and cut more complex partners.
Common tooth shape
- Precision bar provides accurate cuts with fine finishes.
- Buttress blade provides faster cutback and large chip load.
- Scratching claw gives additional permission for quick cuts and soft materials.
At least two teeth must be in contact with the workpiece at all times to avoid stripping of teeth.
See also
- Chainsaw
- Bandsaw Box
- Portable sling
- Knife band
- The wire saw
References
Bibliography
- Todd, Robert H.; Allen, Dell K.; Alting, Leo (1994), Manufacturing Process Reference Guide , Industrial Press Inc., ISBN 0-8311-3049-0 .
- Duginske, Mark (1989). The Bandsaw Handbook . Sterling Publishing. ISBNÃ, 0-8069-6398-0.
Source of the article : Wikipedia
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