metal working tools, hacksaw, cold chisels, centre punch

1. TOOLS
Online lessons (tools metal)

2. General working steps
• 1st safety
• 2nd marking out/measuring
• 3rd hold work
• 4th cutting out

3. Safety
• Always take protective measures
• Tools have sharp blades
• Cutting metals generates swarf, sharp edges
• Some holing tools are heavy(made from cast iron)
• Safety equipment: gloves, protective glasses, googles, face mask.

4. Working with metals
• Marking out tools (metal work)
Engineers square
Scriber Centre punch Steel rule

5. Measuring, marking out
• Engineers square
• Used for checking squareness.
• For marking lines at 900
• To differentiate between a try square or
engineers square. Stock is made from metal

6. • Checking squareness

7. Marking a line at 900

8. Scriber
Tip is hard (high carbon steel).
Either end may be used.
Leaves a permanent mark on metal surface.
Difficult to erase, must be careful while
marking.

9. Marking out lines permanently

10. Centre punch
Tip is hard (high carbon steel).
Used for making indentation before drilling on a
metal surface.
It is used with a hammer

11. Importance of having an
indentation before drilling
Making an indentation using a
centre punch and hammer

12. Cutting tools
• A hacksaw is used for cutting metals
e.g round bars, falt bars, square bars
• The blade can be replaced.
Round bars Flat bars Square bars

13. Using a hacksaw
Work held using engineers vice

14. Cutting tools
• Junior hacksaw is used for
smaller work.
• It can be used for cutting
metal pipes

15. Using a junior hacksaw
Work held in engineers vice.

16. Cutting tools
• Abrafile is used for curves, circles
arcs in metal

17. Difference between abrafile and coping saw

18. Cutting tools
Tin snips are used for
cutting thin metal sheets

19. Using tin snips

20. Cutting tools
• Files.
• Also considered as a cutting tool.
• Available in different
shapes and size.
• Files remove sharp,
rough edges on metals

21. Using a file
Work held using engineers
vice.

22. Cutting tools
• Cold chisel.
• Made from hardened steel.
• Used for cutting thin metal sheets.

23. Using a cold chisel
Work held in engineers
vice.
A hammer is used for
hitting on the cold chisel

24. Using a cold chisel
If we need to remove the red
rectangle which is found in the
middle.
We drill a series of holes along the
rectangle.
Then we used a cold chisel and a
hammer to remove the material

25. Measuring instrument
Internal calliper.
Use for checking internal
measurement.
Must be used with a ruler.
Not a precision instrument.

26. Measuring instrument
External caliper.
Used for checking external
Measurements.
Must be used with a ruler.
Not a precision instrument