LATHE TOOLS (1) Straight shank turning tool (113), which can be used with various types of tool bits for right - and left - hand turning, right - and left - hand facing and threading. Bits can also be ground to special shapes for fillets in cor - ners and the like. (2) Left - hand offset turning tools (114) a r e desirable when the operator wishes to work close to the chuck o r the driving dog. By using this type of tool it is possible to turn the piece up to the chuck and at the same time have the chuck clear the side of the carriage and com - pound rest. Every lathe should be equipped with a complete set of lathe tools for turning, facing, threading and boring.
They can be of the tool holder type using high - speed steel bits, such a s a r e made by Williams, Armstrong ( 111 ) , o r O.K. (112). These types a r e the most co m- monly used; however, forged tools a r e still used in many shops. (3) Right - hand offset turning tools (115) answer the same purpose when working at the tailstock end. Various shaped bits can be used in either right - o r left - hand turning tool holders to suit the work being done. (3a) Tw o styles of carbide cutting tools are shown. 114a is the standard righthand turning tool with brazed - on car - bide tip. 114b is the triangular insert turning tool. This is used in high - production operations.
Its major advan - tage is that you have three cutting edges, simply obtained by indexing the triangular insert. A complete s e t of tools consists of the following: (4) Straight cutting - off tools (116) a r e used for cutting off in the lathe. The blade used in this tool is g round with the proper side clearance. Then, when properly set in the holder, the tool does not drag. (5) Right - hand cutting - off tool (117) is used for cutting off work close to the chuck. To prevent chatter, when using a tool of this type, excessive overhang of the work should be avoided. (6) Left - hand cutting - off tool (118) i s for use near the tailstock end of the lathe.
This type of tool is r a rely used and in most cases the right - hand and straight cut - ting - off tools serve all purposes.