STEP 10. SELECT CHIP BREAKER
Chip control is a very important aspect of machining operation, especially on the lathe. Cutting tools on the lathe that have no chip breakers tend to produce long, stringy, or coiled chip which because they are very sharp on the edge and can cause severe cuts are a hazard to the operator. The ideal shape for chips is shown in Figure F-28, the compact “9”- shaped chip. Such chip formation is a necessity in manufacturing operation, where the chips are removed by a conveyor. Most cemented carbide inserts are provided with a chip breaker, whose object is to from the desirable chip formation (Figure F-42). However, other factors, such as feed rate, depth of cut, and work piece material, affect the chip curl and its final shape. A higher feed rate and deeper cut tend to curl the chip more, whereas a light cut and small feed rate will often produce a long stringy chip even if the tool has a chip breaker. A tough or hard work piece will curl the chip more than a soft material. These factors are taken into account in Figure F-43 and in table F-7. These ranges for chip breaker application are for Kennametal inserts. However, every tool manufacturer provides its own special shapes and specifications for their use with various materials and applications. Catalogs containing tool specifications are generally available from tool distributors.
STEP 10. SELECT CHIP BREAKER
Chip control is a very important aspect of machining operation, especially on the lathe. Cutting tools on the lathe that have no chip breakers tend to produce long, stringy, or coiled chip which because they are very sharp on the edge and can cause severe cuts are a hazard to the operator. The ideal shape for chips is shown in Figure F-28, the compact “9”- shaped chip. Such chip formation is a necessity in manufacturing operation, where the chips are removed by a conveyor. Most cemented carbide inserts are provided with a chip breaker, whose object is to from the desirable chip formation (Figure F-42). However, other factors, such as feed rate, depth of cut, and work piece material, affect the chip curl and its final shape. A higher feed rate and deeper cut tend to curl the chip more, whereas a light cut and small feed rate will often produce a long stringy chip even if the tool has a chip breaker. A tough or hard work piece will curl the chip more than a soft material. These factors are taken into account in Figure F-43 and in table F-7. These ranges for chip breaker application are for Kennametal inserts. However, every tool manufacturer provides its own special shapes and specifications for their use with various materials and applications. Catalogs containing tool specifications are generally available from tool distributors.
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