Cutting tools 105-9 clearance angle

Stable depth of cuts obtained in chatter tests can be used to determine the process damping and the indentation force coefficients between the flank face of the tool and the material (Budak and Tunc 2010). In addition to the cutting speed and the vibration frequency, which determine the wavelength, clearance angle and edge hone... 

The cutter is equipped with unobstructed rake face unique inserts to permit easy chip flow in HSC and two PCD projecting cutting edges for improved tool life. The inserts have positive rake angles and large clearance angles for better stability, lower cutting forces, better chip control, and improved wear behavior. 

All cutting tools whether held by hand or in a machine, must possess certain angles in order to cut efficiently. The first essential is a clearance angle, which is the angle between the cutting edge and the surface of the... 

Cutting tools for use in turning may be required to cut in two directions. Such tools must therefore be provided with a rake and clearance angle for each direction of feed movement. This is illustrated in Fig. 7.7 which shows a turning tool for facing and turning. 

Cutting tools which are used to cut in only one feed direction require only one rake angle, although a number of clearance angles may be required to prevent rubbing. The knife tool shown in Fig. 7.9(a) acts in the direction shown, and a rake and a clearance angle are required in the same direction. Front clearance is also required to clear the workpiece surface. 

Tool overhang should be kept to a minimum. Tools must be kept sharp to avoid buildup that can cause failure of the tool or the workpiece. A tool geometry similar to that used for cast iron is generally suitable. Liberal rake and clearance angles can be used. Cutting fluids are required to control the tool-tip temperature. Water-soluble cutting oils work well. 

It is essential that all cutting tools used on a lathe be set on the centre of the workpiece. A tool set too high reduces the clearance and will rub, while one set too low reduces the rake angle,... 

High-speed-steel cutting tools in a centre lathe can be used to turn plastics materials. Clearance angles should be increased to around 20 . A rake angle of 0° can be used on the more brittle plastics, while a 15° rake used on softer plastics aids the flow of material over the tool face. 

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