unit 213 power point presentation 1

© 2013 City and Guilds of London Institute. All rights reserved. 1 of 17

Level 2 Diploma in Bench Joinery

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Presentation 1

Unit 213: Mark out from setting out details for bench joinery products



Learning outcomes1 Understand the effect of marking out errors on work.

2 Know how to mark out for bench joinery products.

3 Be able to mark out for bench joinery products.



Aims and objectivesBy the end of this session, learners will:

• be able to fully appreciate the importance of accurate marking out and the financial penalties associated with them

• know the tools required to accurately mark out for bench joinery products

• know how to use those tools in accurately marking out a bench joinery product.



Health and safety and risk assessmentsAll actions and tasks consistent with construction/bench joinery and carpentry works are covered by the:

Health and Safety at Work Act

Provision and Use of Work Equipment Regulations (PUWER)

Approved Code of Practice (ACoP)

personal protective equipment at work (PPE)

environmental regulations.

You should also have in place all the relevant risk assessments to cover the work you are about to undertake. All of the above should be fully adhered to when carrying out work.



WastageTime and materials are both in short supply.

Companies do not survive long if they do not make a profit.



Errors and their possible consequencesThere are many negative effects of errors in the marking-out process.

• Wastage of materials.

• Time wasted in remarking and machining material.

• Cost implications of extra man hours to carry out the remedial work above.

• Possible loss of future contracts because of the schedule has overrun.

• Delay for other contracts scheduled to follow.

• Possible enforcement of penalty clauses due to late delivery.

• Possible closure of joiner’s shop and redundancies due to no future work.



Accuracy and errorsLack of accuracy in taking measurements from working drawings or job sheets can also result in the possible outcomes given in the previous slide.

Discrepancies in the specification, schedule or working drawings should have been noticed prior to the job sheet arriving with the bench joiner, but things do get missed:

• an E with the bottom line accidently missing becomes an F.

• an 8 partly rubbed out becomes a 3

So slight errors are possible.

It is essential that any alteration to the job sheet or specification should be written down and signed by either the line manager, manager, architect or client to ensure disagreements do not occur on completion.



Accuracy and errors continuedAccurately setting out and cross-referencing all information regarding bench joinery to establish the existence of any discrepancies is very important as errors not seen at the early stages of setting out can have severe consequences further on in the manufacturing stages.

Lines drawn like these will give a different inside or outside measurement

than ones drawn like these

This is because of the thickness of the lines which over many increments of the measurement will make your setting out wrong by a long way. Mistakes of this type can cause remakes, waste of materials, late delivery and ultimately the possibility of penalty clauses being enforced, so a sharp pencil at all times is of the utmost importance.



Accuracy and errors continued

You should be aware at all times that one small error will compound itself to eventually become a large error.

The old adage of measure twice, cut or mark out once is still true today.

Errors and discrepancies should be reported to the person directly above you in the management.



Knowing how to mark outOn the following slide you will be asked to indentify the tools required for marking out bench joinery products. As level two learners these should be easily recognised by you.

They are the second most important tools of your chosen trade.



Tools for marking out

Combination squareCarpenter’s try square

Marking gaugeMortice gauge Cutting gauge

Set mitre

Combination gauge

Sliding bevel

Tape measure Range of steel rules

Squaring over box

American roofing square

Marking knife Dividers

Images courtesy of www.workshopheave.com; www.screwfix.com; www.shutterstock.com; David Walker. Reproduced with permission.

Framing square

Protractor, drawing set squares, compass, pencils

http://www.workshopheave.com/

http://www.screwfix.com/

http://www.shutterstock.com/



Rod boardsA rod board or drawing is important because it is a constant reference point for bench joinery products. It never changes and can be used to remake the same joinery product year after year which will always be the same product.

The accuracy and care taken over the production of a rod board is essential for the conversion of the information taken from it into a bench joinery product which complies with the clients requirements.

Errors and inaccuracies in the rod board/drawing may cause many ongoing problems.

It should also be noted that a pattern should always be used when marking out pairs or multiples of the same part of the product – this will ensure accuracy of producing these multiples.



Rod boards continued

Measurements never alter so if a new or replacement window is required for example, by having a rod board it can be easily reproduced at any later stage.

Disadvantage: boards take up space.

Rod boards can be drawn on paper.

Disadvantage: can be torn or easily damaged.

The choice is up to you.



Face side and edge marksFace side and edge marks are marked on the material to ensure that the marking out is carried out from the same side and edge.

This means that the finished product fits properly and the faces all end up flush and in the correct position for completion.

Failure to put these marks on the material could result in the product being put together incorrectly and a remake being required.



Versatility of a box squareThe box square is the only square that can accurately transfer marks around moulded material.

Although it is possible to use either a set or combination square they will rock unsteadily on the material.

This is because the stock and arm are too thin to provide a good surface contact with the two areas that need to be marked out.

With a box square it is possible to accurately transfer marks around the material because of the two much larger surface areas in contact with the material.



Marking out joints and sectionsWhen marking out the moulding profile you require, it is important to make sure the section drawing corresponds with your chosen face side and edge.

All components should be marked out before any practical work is started. This ensures that all components will match each other and any errors, discrepancies or design faults can be seen and rectified before the production starts.

It also helps with continuity of work. If any operative is off ill, the other staff members will have the all the relevant details on the materials to keep the production moving forward without having to continually refer back to job sheets or specifications.



Any questions?

unit 213 power point presentation 1

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