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Lathe knives - Technical articles

Lathe knives are tools of basic equipment of a tool room, having both conventional and CNC lathe knives in their equipment. Lathe knives are available in several versions, as lathe knives assembled on a separate lathe plate (multi-tool), knives with a brazed plate, holder knives otherwise known as steels. Depending on the machining needs of both the quantity and design of the workpiece, we can adjust the turning knives.

What kind of turning knives to choose?

Depending on the type of turning and the machine park we have, we should choose knives. Folding turning knives are the most efficient solution, thanks to the use of indexable inserts the fixed cost is only the cutting inserts and the rest of the knife remains. What's more, forked inserts are usually multi-edged and have multiple cutting edges, and when 1 edge gets dull, just turn the insert and we have another new blade ready to go. A folding lathe knife is built with a shank, a socket for a multi-edge insert. Their dimensions will be determined by the 5 letter name followed by the size of the shank and the size of the cutting insert, e.g. PWLNR 25x25 08, which means that the knife is designed for WNMG 080408 insert. In our offer you will also find turning inserts designed for folding turning knives.

Characteristics and prices of other turning knives

Prices of lathe knives with brazed insert or high-speed steel are lower than folding knives in purchase and are often a better choice for conventional machines.

Solder-plate latheknives are a very good choice for unit and small batch production. They are inexpensive to buy and have a high impact resistance so we can turn shafts when the rigidity of the machine is not too high. In addition, we can grind the brazed plate, adjusting its shape to our individual requirements. This is a huge underestimated advantage of these knives, a very common problem occurring in folding lathe knives is the shape of the forked insert whether round or for trapezoidal threads ( boring bars ).

In the case of lathe k nives with a brazed insert, we can supply a template and polish the insert as desired, reducing costs by not having to buy non-standard tools.

Depending on the application, turning kniveswith b razed plate have the following designations: knives for steel are marked according to ISO P - with blue color, knives for cast iron are marked with red color and letter K, knives for stainless steel are marked with letter M20 and yellow color. Similar knives are high-speed steel turning knives. Unlike knives with a brazed plate, high-speed steel knives have the HSS tip itself. They are more expensive than insert knives but are definitely easier to fit into unusual shapes and easier to grind.

Turnery knives are semi-finished knives that are completely raw. They have a cross section of a square, rectangle or circle of a certain length. The size of the holder knives is determined by specifying 2 dimensions of the cross-section ( or diameter in the case of a shaft) and length and also the material, e.g. holder knife 16x16x160 HSS.

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