Instruction example 12.4. Flat chisel and cape chisel

Exercising of sharpening of chisels

Material

- Worn flat or cape chisels

or

- Flat material of tool steel (carbon content: 1 to 1.1 %)

Thickness:	12 mm
Width:	20 mm
Length:	162 mm

Figure

Working Tools

Hand hacksaw, steel scriber, whetstone

Measuring and testing tools

Steel rule, vernier caliper, grinding gage or protractor

Accessories

Vice, coolant (water)

Required previous knowledge

Reading of the drawings, measuring, testing, sawing, chiselling

Sequence of operations	Comments
1. Arrange workplace prepare working material	- Check for completeness
2. Sawing of the flat material to length	- Only if original tools are not available
3. Place the flat chisel (1) with its wide side horizontally against the wheel and uniformly move to and fro until the taper has reached a length of 60 mm	- Uniformly grind the taper by permanently changing the sides! - Cool constantly!
4. Grinding of the blades in vertical position by uniform pressure against as well as to-and fro movements	- Forefinger lies between the chisel and the grinding support!
5. Checking of the surface of the taper as well as of the quality of the blades	- Surfaces to be smooth, blades to be sharp as well as parallel and angular to the outer edges
6. Place the cape chisel (2) with its flanks horizontally against the wheel and grind (move to and fro)	- Permanently change the sides and cool!
7. Place the blades in vertical position against the wheel and grind alternately by a short pressure against	- Attention! Risk of drawing the temper - cool!
8. Checking of the surfaces as well as of the quality of the blades	- Same as for flat chisel
9. Clean whetting of the blades with the whetstone (removing of the burr)	- Pull along the side of the blade
10. Final check	- Accuracy to size, appearance, grinding pattern (as per drawing)

Completion: Have the blades hardened to HRC 48

Flat chisel and cape chisel