Information AboutTool Bit |
| CATEGORIES ABOUT TOOL BIT | |
| metalworking cutting tools | |
| cutting tools | |
| lathe | |
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Originally, High Carbon Steel was used with the appropriate Hardening and Tempering . This material has been replaced with HSS due to its improved properties, and it usually takes the form of a simple square bar. The Cutting Edge is ground to suit a particular machining operation and may be resharpened or reshaped as needed. The ground tool bit is then held solidly by a tool holder while it is cutting. TOOL HOLDERS By confining the expensive hard cutting tip to the part doing the actual cutting, the cost of tooling is reduced. The supporting tool holder can then be made from a tougher steel better suited to the task. This makes the tooling cheaper as not all of it is affected by the immediate wear on the cutting tool and does not need to be replaced as frequently, major accidents aside. The tool holders may also be designed to introduce additional properties to the cutting action, such as
CARBIDES AND CERAMICS Not all tool bits are HSS. Materials like Carbide , ceramics like cubic boron nitride, and diamond all allow faster material removal than HSS. Because these materials are expensive and hard to work with typically the body of the cutting tool is made of steel, and a small cutting edge made of the harder material is attached. The cutting edge is usually either screwed on (in this case it is called an insert), or brazed on to a steel shank (this is usually only done for carbide). Inserts Almost all high performance cutting tools use the insert method. There are several reasons for this. First of all, at the very high cutting speeds and feeds supported by these material, the cutting tip can reach temperatures high enough to melt the brazing material holding it to the shank. Economics are also important: with inserts they are made symetrically so that when the first cutting edge is dull they can be rotated, presenting a fresh cutting edge. Some inserts are even made so that they can be flipped over giving as many as 6 cutting edges per insert. There are many types of inserts: some for roughing, some for finishing. Others are made for specialized jobs like cutting threads or grooves. OTHER TYPES Tool bit may also refer to other high speed cutting tools such as Slot Drill , End Mill or carbide Tipped Tool . |
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