FUNDAMENTALS OF CUTTING G Vishnuvarthanan Indra Engineering Services Coimbatore – 641 035

What Do We Use To Cut A Apple ?

Which Tool? Scale Knife

Knife is Harder Knife is Sharper It is used to cut, with ease i.e Approach Angle

What Do We Use To Cut Steel or Cast Iron or Stainless Steel? Tungsten Carbide – Since it’s harder than most of the materials. Diamond is hardest than all other materials.

What is Common in this Process? Turning Milling Drilling Grinding

What is Common in this Process? These Operations have material being removed

What is required for machining? Depth of Cut - Preset interference between tool and work piece Feed - Motion to bring in additional material for machining Speed - What generates the basic wedge and cuts

Machine Classifications Turning Center or Lathe Vertical Machining Centre (VMC) Horizontal Machining Centre (HMC) Special Purpose Machines (SPM)

Zones of Heat Generation Chip Tool Interface Shear Zone Work Tool Work Interface

Heat Dissipation 80% Energy is 18% of Energy converted to heat Work 80% Energy is converted to heat 18% of Energy is converted to heat 2% of energy

TOOL WEAR Gradual Tool Wear Premature Wear or failure Unavoidable but controllable Premature Wear or failure Avoidable

How Do We Rate Machinability? Tool life in minutes Cutting forces and Power consumed Quality of Surface Finish Chip formation Material removal rate