Saturday, 30 June 2012

Introduction to BandSaw Machines

A bandsaw is a power tool which uses a blade consisting of a continuous band of metal with teeth along one edge to cut various workpieces. The band usually rides on two wheels rotating in the same plane, although some bandsaws may have three or four wheels. Bandsawing produces uniform cutting action as a result of an evenly distributed tooth load. Bandsaws are used for woodworking, metalworking, or for cutting a variety of other materials, and are particularly useful for cutting irregular or curved shapes, but can also be used to produce straight cuts. The minimum radius of a curve that can be cut on a particular saw is determined by the width of the band and its kerf.


Bandsaws for cutting metal are available in vertical and horizontal designs. Typical band speeds range from 40 feet (12 meters) per minute to 5,000 feet (1,500 meters) per minute, however specialized bandsaws are built for friction cutting of hard metals and run band speeds to 15,000 feet per minute. Metal-cutting bandsaws are usually equipped with brushes or brushwheels to prevent chips from becoming stuck in between the blade's teeth. Systems which cool the blade are also common equipment on metal-cutting bandsaws. The coolant washes away chips and keeps the blade cool and lubricated.


Horizontal bandsaws hold the work piece stationary while the blade swings down through the cut. This configuration is used to cut long materials such as pipe or bar stock to length. Thus it is an important part of the facilities in most machine shops.


A vertical bandsaw, also called a contour saw, has a stationary blade while the workpiece is moved against the blade. This type of saw can be used to cut out complex shapes and angles. The part may be fed into the blade manually or with a power assist mechanism. This type of metal-cutting bandsaw is often equipped with a built-in blade welder.
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