Single Point Cutting Tools

SINGLE POINT CUTTING TOOL

A Presentation On

ByGIRISH YUVRAJ SURVE (13255)

• Types of tools• Tool geometry• Tool designation

1. ASA System2. ORS System

• Effects of back rake angle on machining• Effect of side rake angle• Effect of relief angle• Effect of cutting edge angle• Effect of nose radius on machining• Tool material• Conclusion • References

Content

Types of tool1. Single point cutting tool

• One cutting tip is available• e.g. lathe machine tools, shaping tools, planning tools, etc.

2. Multi-point cutting tool• More than one tip is available• e.g. milling cutter, grinding wheel, drill, etc.

MULTIPOINT CUTTING TOOLS

Tool Geometry

Tool Designation

1. ASA System

2. ORS System

3. NRS System

ASA System

• Angles are measured with reference to 3 mutually perpendicular planes.

• Understanding is easy.

• Measurements of angles is also easy.

• Analysis of machining is difficult.

ORS System

• Angles measured with reference to major cutting edge.

• Analysis is easy.

• Understanding is difficult.

• For measurement of angles, we require special fixtures.

Effect of Back rake angle on machining

As back rake angle increases,• Strength of tool increases.• Forces on tool decreases.• Power required for machining is decreases.• Tool life increases.

Maximum +ve rake angle used is 45 degree.0 degree rake angle used for brass workpieces.Also for thread cutting 0 degree rake angle is used. -ve rake angle is used carbide cutting tool. -ve rake angle used is 10 degree only.

Effect of side rake angle on machining

As side rake angle increases,

• Strength of tool increases.

• Forces are decreases but in small amount.

• Power is also decreases but in small amount.

• Tool life is increases.

Generally side rake angle is in between 5 to 15 degree.

Effect of relief angleProvided to avoid rubbing between tool and workpiece.

As relief angle increases,

• Strength decreases.

• Forces are slightly decreases.

• Tool life is slightly increases.

Effect of cutting edge angleMainly influence the surface finish of component.

By reducing end cutting angle or by increasing side cutting angle, nose size

increases and surface finish also increases.

Effect of nose radiusMainly influence the surface finish.

With increase in nose radius, surface finish increases.

Tool material• High carbon steel• High speed steel• Stellite• Cemented carbide+• Ceramics• Cermets• Diamond• CBN (Cubic Boron Nitrite) or Borozone• Ucon• Sialon

Conclusion• There are many advantages of single point cutting tool, but there also many

disadvantages.

• Many disadvantages of single point cutting tool are reduced by multi point

cutting tool.

• In this we see geometry of cutting tool, material of cutting tool, etc.

references

• Production technology by P. C. Sharma

• Workshop technology by Hajara Choudhari

• Website – slideshare.net