194 Module 17 • Centre lathe Double cone mandrel
As can be seen in the diagram, the workpiece is squeezed between two cones which hold it securely. Fitment is quick and easy.
driving plate live centre carrier fixed cone loose cone dead centre
nut
flat side for carrier pin
carrier pin Figure 17.5 Double cone mandrel 17.3 Different clearance angles on different lathe cutting tools
Centre lathe cutting tools However superior a centre lathe may be, its efficient operation and the quality of the finished work will depend on the cutting tools used. Two primary characteristics of a high-quality cutting tool are toughness which permit them to withstand shock, heavy pressure and hardness, which allows it to maintain a sharp cutting edge.
Centre lathe cutting tools are divided into four groups:
• Solid (one piece) tools of carbon or high-speed steel (HSS), gripped directly on the tool post.
• Tool holder bits of high-speed steel (HSS), which are square or round and held in tool holders.
• Tip tools of different types.
• Special tools, e.g. boring bars which hold tool bits, boring tools, knurling tools and form tools of various kinds
Conventional cutting tool angles
Te wedge form of the cutting part of a lathe tool involves two components, namely the rake angle which is the slope on the face, away from the cutting edge and the clearance angles below the cutting edge, without which the tool would rub on the workpiece and generate heat which could damage the workpiece.
work piece washer
tail stock spindle
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