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		Grinding of Simple Tools - Course: Technique for manual working of materials. Instruction examples for practical vocational training (Institut für Berufliche Entwicklung, 23 p.)
			(introduction...)
			Introduction
			Instruction example 12.1. Centre punch and scribing punch
			Instruction example 12.2. Steel scriber
			Instruction example 12.3. Screw driver
			Instruction example 12.4. Flat chisel and cape chisel
			Instruction example 12.5. Drill with standard drill point as well as flat drill point and centre point

Instruction example 12.3. Screw driver

Exercising of grinding of screw drivers

Material

- Worn screw drivers

- Round material of tool steel

(carbon content: 1 to 1.1 %)
Diameter: 5 mm

Figure

Working Tools

Hand hacksaw, engineer's hammer

Measuring and testing tools

Vernier caliper

Accessories

Surface plate, coolant (water)

Required previous knowledge

Reading of the drawings, measuring, testing, hammering

Sequence of operations

Comments

1. Arrange workplace prepare working material

- Check for completeness

2. Sawing of the round material to length

- Only if original tools are not available

3. Hammering of the screw driver blade (both sides) with the hammer face

- See to uniformity of the width!
Hammer no edges into the surface!

4. Grinding of the screw driver blade in vertical position by placing it flat against the wheel and slightly pushing up and down

- Place the screw driver blade far above against the grinding wheel! - Cool!

5. Checking of the concaving and of the accuracy to size

6. Grinding of the tang in horizontal position

- Turn quickly!

7. Final check

- Accuracy to size, grinding pattern (as to drawing)

Completion:

Hardening of the blade to HRC 42

Hammering of the enlargement of the handle below the tang

Fixing of a wooden handle

Screw driver

Sequence of operations	Comments

1. Arrange workplace prepare working material	- Check for completeness

2. Sawing of the round material to length	- Only if original tools are not available

3. Hammering of the screw driver blade (both sides) with the hammer face	- See to uniformity of the width! Hammer no edges into the surface!

4. Grinding of the screw driver blade in vertical position by placing it flat against the wheel and slightly pushing up and down	- Place the screw driver blade far above against the grinding wheel! - Cool!

5. Checking of the concaving and of the accuracy to size

6. Grinding of the tang in horizontal position	- Turn quickly!

7. Final check	- Accuracy to size, grinding pattern (as to drawing)