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close this bookMarking and Punch Marking - Course: Technique for Manual Working of Materials. Instruction Examples for Practical Vocational Training
View the document(introduction...)
View the documentIntroduction
View the documentInstruction example 2.1. Door lock panel
View the documentInstruction example 2.2. Holding Clamp
View the documentInstruction example 2.3. Drill stand
View the documentInstruction example 2.4. Angle gauge
View the documentInstruction example 2.5. Bow for C clamp
View the documentInstruction example 2.6. Open-end wrench 19/24
View the documentInstruction example 2.7. Base plate

Instruction example 2.1. Door lock panel

To practise scribing of straight and parallel lines with steel measuring tool, steel straight edge and steel scriber based on datum edges.

Material

Sheet steel (approx. 380 MPa), rolled
Thickness: approx. 2 mm
Width: approx. 30 mm
Length: approx. 240 mm
(One longitudinal edge and one end edge to be flat and at right angle)


Figure

Hand tools

Smooth-cut file 300 mm (flat), steel scriber, prick punch, engineers’ hammer

Measuring and testing tools

Steel measuring tool, steel straight edge, try square

Accessories

Surface plate, copper sulphate solution, brush

Required previous knowledge

Reading of drawings, measuring, testing.

Sequence of operations

Comments

1. Arrange the working place, prepare the working materials.

- Check for completeness.

2. Check the edges for flatness and squareness, if necessary file one longitudinal edge and one end edge flat and at angle of 90°.

- Check with try square
(upper edge - right-hand longitudinal edge)

3. Coat steel sheet surface with copper sulphate solution and let it dry.

- Danger:
copper sulphate solution is toxical.

4. Lay off with steel measuring tool 3 measuring points (size 26 mm) over the length of the pre-worked longitudinal side (right-hand datum edge) and mark with steel scriber.


5. Line up the measuring points with steel straight edge and connect such points with scriber.

- Hold steel straight edge firmly in place.

6. Lay off with steel measuring tool 2 measuring points (size 230 mm) on pre-worked end side (datum edge on top), mark and connect them.


7. Scribe all other inner contours as described above, always based on the two datum edges.


8. Prick-punch check marks over all scribed lines at 7 - 10 mm distances.

- Prick-punch just slightly’

9. Final inspection.

- Dimensions and cleanness of scribed lines.

Completion

Drill and file to size the rectangular inner contours. Cut the outer edges by saw or shear. Slightly chamfer all edges. Drill the 3 holes for fixing to the door frame.


Door lock panel