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close this bookHammering and 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 3.1. Nameplate
View the documentInstruction example 3.2. Number Plate for Locker
View the documentInstruction example 3.3. Screw Driver
View the documentInstruction example 3.4. Copper Bit of a Soldering Iron
View the documentInstruction example 3.5. Bowl with Cover
View the documentInstruction example 3.6. Table to determine Tapping Drill Holes and Bore Depths
View the documentInstruction example 3.7. Table to determine Widths across Flats and Widths across Corners of Hexagonal-Head Screws

Instruction example 3.2. Number Plate for Locker

To practise curving of sheet steel by hammer blows with the pane according to the size specified, flattening of a surface section by a sledge and simple marking.

Material

General-purpose constructional
Steel sheet strip (340 MPa)
Thickness: 2 mm
Width: 20 mm
Length: 80 mm


Figure

Hand tools

Hand hacksaw or lever shear, engineers’ hammer (500 g) or curving hammer, scriber, centre punch, 2 mm dia. drill, sledge, marking punch (figures).

Measuring and testing tools

Steel measuring tool, radius gauge (65 mm)

Accessories

Surface plate, vice, flat nose plier or pin vice

Necessary additional knowledge

Reading of drawings, measuring and testing, marking and punch-marking

Sequence of operations

Comments

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

- Check for completeness.

2. Check for initial dimensions, otherwise cut the sheet strip to size according to size specified and scribe the notches.

- Stage (1)
Use hand hacksaw or lever shear.

3. Saw out the notches of 15 mm length at both ends, scribe the bore holes, prick-punch and drill the holes of 2 mm dia.

- Stage (2)
Drill under supervision of the instructor.

4. Grip the sheet strip at one end by means of flat nose plier or pin vice and hammer with the hammer pane from the centre of the sheet strip outward, then straighten the sheet strip.

- Stage (3)
Work on upper edge only
(as per drawing)!

5. Check radius 65 for size, if necessary repeat operation 4.

- Use the radius gauge.

6. Curve the inner edges of the notches at both ends of the sheet strip by hammer blows with the hammer pane as per drawing until the corner-to-corner size of 45 mm is reached.


7. Flatten the area for the number according to the number of figures by means of hammer and sledge.


8. Mark the number by means of marking punch.


9. Final inspection.

- Dimensions, appearance, quality of the number.


Number Plate for Locker