1. FUNDAMENTALS OF CUTTING
G Vishnuvarthanan Indra Engineering Services Coimbatore –

2. What Do We Use To Cut A Apple ?

3. Which Tool?
Scale
Knife

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

5. 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.

6. What is Common in this Process?
Turning
Milling
Drilling
Grinding

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

8. 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

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

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

11. 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

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

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