l2 bench joinery unit 211 power point presentation 3

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Level 2 Diploma in Bench Joinery

PowerPoint presentation

Safe working practices and procedures for changing a circular saw blade

Unit 211: Set up and operate a circular saw

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Level 2 Diploma in Bench Joinery

Safety legislationThe main legislations covering circular saws are:

• The Provision of Work Equipment Regulations 2002 (PUWER)

• Safe Use of Woodworking Machinery Approved Code of Practice (ACoP)

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Level 2 Diploma in Bench Joinery

Safety pre-checksBefore any maintenance is to be carried out on any saw ensure that:

• the machine has stopped

• the machine is isolated and locked

• a sign has been placed on the machine warning ‘Do not operate. Maintenance in progress’.

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Level 2 Diploma in Bench Joinery

Changing the saw bladeThe need to change a saw blade is usually as a result of one of the following.

• The teeth have become damaged or blunt.

• The teeth require cleaning of resign build up.

• The type of material being cut.

• The type of cutting process requires a different type of blade.

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Removal of the bladeThis is the same process for rip saw benches and dimension saw benches.

• Consult the risk assessment to ensure you are following all required control measures.

• Ensure you are trained and authorised to carry out this activity.

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Mounting systemThe saw blade is mounted on a spindle that is located below the machine table.

The saw blade is held in position by:

• the flange

• the drive pin

• a removable flange

• a nut.

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Level 2 Diploma in Bench Joinery

Procedure for removal of the blade1. Remove or raise the crown guard.

2. Remove finger plate or draw back sliding table.

3. Undo the nut, noting that it will have a left-hand thread.

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Level 2 Diploma in Bench Joinery

Procedure for the removal of the blade continued4. Remove the nut and flange.

5. Remove the blade. Do not place it directly onto the metal bed – place it onto timber to protect the teeth.

6. Clean the flanges, spindle and nut.

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Level 2 Diploma in Bench Joinery

Selecting the type of blade 7. Select the required tooth material for the intended material to be cut.

8. Select the replacement blade. Ensure the correct angle of the hook for the intended working activity.

9. Ensure the blade is within the size limits.

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Riving knife10. Remove the riving knife and clean.

11. Select a riving knife suitable for the replacement blade. Think about: • length• thickness• radius to follow blade.

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Level 2 Diploma in Bench Joinery

Fitting a replacement blade12. Locate the blade on the spindle, ensuring it is facing in the correct direction.

13. Engage the driving pin, which should be at the top of the blade.

14. Replace the outer flange and nut.

15. Fully tighten with the correct length spanner.

16. Position the riving knife as close as practicable to the blade and tighten.

17. Ensure the riving knife follows the curve of the blade and is no more than 8mm away from the blade.

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Riving knife position: blades less than 600mm in diameter

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Level 2 Diploma in Bench Joinery

Riving knife position: blades more than 600mm in diameter

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Level 2 Diploma in Bench Joinery

Pre-start checks18. Fit all the guards and refit the finger plate.

19. Remove all tools, etc.

20. Set the guard as low as possible.

21. Start then stop the machine, listening carefully for any unusual noise.

22. Ensure the blade comes to a standstill within 10 seconds.

23. Set the guards in the correct position and carry out a trial cut.

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Any questions?