Week No. 05 Lesson Name Chisel Lesson No. 08 Week No. 05 Lesson Name Chisel

CHISEL Use:- To chip and cut flat surfaces, slots and grooves. Material:- High carbon steel or Chrome vanadium steel Types:- A. Cold chisel B. Hot Chisel Use:- They are used to remove metal from large flat surface and chip excess metal weld joints and castings. Point Head Body Flat Chisel

Cross cut Chisel Half round nose Chisel Use:- These are used for cutting keyways, grooves and slots. Half round nose Chisel Use:- They are used for cutting curved grooves (oil grooves)

Diamond point chisel Web Chisel Use:- These are used for squaring materials at the corners. Web Chisel Use:- These chisels are used for separating metals after chain drilling.

Point angle:- The correct point/ cutting angle of the chisel depends on the material to be chipped. Sharp angles are given for soft material and wide angles for hard material. The correct point angle and angle of inclination generates the correct rake and clearance angle Point angle Inclination angle

Rake angle:- Rake angle is the angle between the top face of the cutting point and normal to the work surface at the cutting edge. Rake angle Clearance angle Clearance angle:- Clearance angle is the angle between the bottom face of the point and tangent to the work surface originating at the cutting edge. If the clearance angle is too low or zero, the rake angle increases. The cutting edge cannot penetrate into the work. The chisel will slip. If the clearance angle is too great, the cut progressively increases.

QUESTIONS List the type of chisel What are the parts of Chisel? Which material is used in Chisel? What is the use of Chisel?

Thus, we learnt about chisel. CONCLUSION Thus, we learnt about chisel.