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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 12.2. Steel scriber

Exercising of the sharpening of steel scribers

Material

- Worn steel scriber or

- Round material of silver steel:

(carbon content 1.1 to 1.25 %)

Diameter:

4 mm

Length:

150 mm

- Hexagonals of standard steel (380 MPa)

width across flats:

10 mm

Length:

78 mm

Figure

Working Tools

Hand hacksaw, drill 3.3 mm dia.; tap and threading die M4

Measuring and testing tools

Vernier caliper

Accessories

Coolant (water), cutting oil, tap wrench

Required previous knowledge

Reading of the drawings, measuring, testing, scribing, prick-punching, (sawing, drilling, countersinking/counterboring, threading - when manufacturing the steel scriber)

Sequence of operations

Comments

1. Arrange workplace prepare working material

- Check for completeness

2. Manufacturing of the individual components as per drawing

- Only if original tools are not available

3. Grinding of a chamfer of 4 mm at both sides of the handle - horizontal or vertical position!

- Press the workpiece against the wheel with a setting angle of 30°

4. Screwing of the scriber with the handle

- Firm joint!

5. Grinding of a 15 mm long taper on the scriber - horizontal position!

- Attention I Forefinger lies between the grinding support and the distance between the grinding support and the wheel, 2 mm max.!

6. Grinding of the point - vertical position!

- Turn quickly -cool much! Risk of drawing the temper

7. Final check

- Accuracy to size grinding pattern (as to drawing)

Completion: Have the point hardened to HRC 55

Steel scriber

Sequence of operations	Comments

1. Arrange workplace prepare working material	- Check for completeness

2. Manufacturing of the individual components as per drawing	- Only if original tools are not available

3. Grinding of a chamfer of 4 mm at both sides of the handle - horizontal or vertical position!	- Press the workpiece against the wheel with a setting angle of 30°

4. Screwing of the scriber with the handle	- Firm joint!

5. Grinding of a 15 mm long taper on the scriber - horizontal position!	- Attention I Forefinger lies between the grinding support and the distance between the grinding support and the wheel, 2 mm max.!

6. Grinding of the point - vertical position!	- Turn quickly -cool much! Risk of drawing the temper

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