Marking out for fabrication and assembly of marine sheet metalwork

This standard identifies the competencies you need to mark out sheet materials (including simple templates) and sections used in marine sheet metalwork activities, in accordance with approved procedures. You will be required to select the required materials and the appropriate marking out tools and equipment, based on the information presented to you and the accuracy to be achieved. Marking out will be the preparation required for cutting, shaping and forming sheet materials and sections and the onboard positioning of manufactured components, as appropriate to the application. This will include marking out workpiece datums, centre lines, angles and curved details, cutting and bending details (including bending allowances), hole centring and outlining details.

Items to be marked out could be ferrous or non-ferrous materials. Certain materials will require you to take the grain flow into account, to avoid later production process problems.

Your responsibilities will require you to comply with organisational policy and procedures for the marking out activities undertaken and to report any problems with the materials, equipment or marking out activities that you cannot resolve yourself, or are outside your permitted authority, to the relevant people. You will be expected to work with a minimum of supervision, taking personal responsibility for your own actions and for the quality and accuracy of the work that you carry out.

Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to applying marking out procedures for marine sheet metalwork activities. You will understand the marking out process and its application and will know about the materials as well as the care and use of tools, in adequate depth to provide a sound basis for carrying out the activities to the required specification.

You will understand the safety procedures required when using marking mediums and when performing the marking out activities. You will be required to demonstrate safe working practices throughout and will understand the responsibilities you owe to yourself and others in the workplace.

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1. work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines
2. obtain and use the correct information for marking out
3. obtain the appropriate marking out equipment and check that it is in a usable condition
4. prepare suitable datums and marking out surfaces
5. mark out using appropriate methods
6. check that the marking out complies with the specification
7. deal promptly and effectively with problems within your control and report those that cannot be resolved
8. complete relevant documentation in line with organisational procedures

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1. the specific safety precautions to be taken when marking out for the manufacture and installation of marine sheet metal components and assemblies and with the tools and equipment that are used (including any specific statutory requirements, risk assessment procedures and relevant requirements of HASAWA, COSHH and Work Equipment Regulations)

2. the personal protective clothing and equipment (PPE) to be worn when carrying out the marking out and lining off activities (such as leather gloves, eye/ear protection, safety helmets)

3. the correct methods of moving or lifting sheet and section materials

4. the hazards associated with marking out fabricated components (such as working in a marine fabrication environment, lifting and handling sheet/fabricated components, slivers/burrs on sheet materials, using marking out mediums, using laser marking out equipment) and how they can be minimised
5. the procedures to obtain the necessary drawings and job instructions
6. how to extract information from engineering drawings and related specifications (to include symbols and conventions to appropriate BS or ISO standards) in relation to work undertaken
7. how to carry out currency/issue checks of the specifications you are working with
8. how to interpret first and third angle drawings, imperial and metric systems of measurement, workpiece reference points and system of tolerancing
9. how to produce a three dimensional shape from the two dimensional information
10. the preparations to be carried out on the material prior to marking out, to enhance clarity, accuracy, and safety
11. principles of marking out; developing basic shapes (flat, rectangular and cylindrical) from flat sheet, plate or rolled section materials
12. how to select and establish suitable datums, the importance of ensuring that marking out is undertaken from the selected datums and the possible effects of working from different datums
13. the use of marking out conventions, datum edges/lines and centre lines
14. how to calculate and mark out true lengths, bend allowances and circumferences
15. geometrical construction methods for straight and radiused bends, curved or circumference sections, pyramid or cone sections
16. ways of laying out the shapes/patterns to maximise the use of plate or sheet material
17. the material characteristics and process considerations to be taken into account when marking out sheet and section materials 
18. methods of marking out large or long shapes, using chalk lines and laser equipment
19. marking out and transferring information from templates and how to transfer information to the underside of the sheet
20. setting and adjusting tools, such as squares and protractors
21. the process considerations to be taken into account when marking out for the installation of the sheet metal components or assemblies (such as fixing a level line, creating working datums)
22. principles of lining off for the installation of marine sheet metal components, and the type of equipment used
23. how to set up and align the various components and the tools and equipment to be used (such as spirit levels, laser alignment and levelling equipment, water levels and plumb lines)
24. the importance of using tools only for the purpose intended; the care that is required when using the equipment and tools; the proper way of preserving and storing tools and equipment between operations
25. the need for clear lines and dimensional accuracy in marking out to specification and drawing requirements
26. the problems that can occur in marking out fabrication components and how these can be avoided
27. the extent of your own responsibility and whom you should report to if you have problems that you cannot resolve

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1. Mark out sheet or section components on two materials from the following:

   1. cold rolled mild steel                    
   2. aluminium      
   3. lead
   4. coated mild steel (primed, tinned or galvanised)       
   5. brass              
   6. titanium
   7. stainless steel                    
   8. copper            
   9. non-metallic materials

2. Mark out for three of the following forms/shapes of component:

   1. flat covers and plates                         
   2. frames or structures
   3. square and radial bends                        
   4. fish plates, gussets
   5. square/rectangular/box sections                
   6. brackets
   7. cylindrical sections (such as trunking, pipes, tanks)

3. Mark out directly onto sheet or section, from drawings, using eight of the following:

   1. scriber                                  
   2. protractor
   3. punch                                   
   4. dividers or trammels
   5. rule and tape                         
   6. chalk, bluing or paint
   7. straight edge                        
   8. laser
   9. square
   10. french chalk
   11. marker pen

4. Mark out material, to include five of the following features:

   1. datum and centre lines               
   2. curved profiles 
   3. square/rectangular profiles          
   4. cutting and bending detail (including allowances)
   5. angles                                      
   6. hole centring and outlining (circular and linear)
   7. circles

5. Line off for the installation of manufactured components, considering all of the following:

   1. positional accuracy (orientation)
   2. height above/below the vessel/structural datums
   3. distance from vessel/structural centre lines
   4. clearance (shock) from adjacent equipment/components

6. Use two of the following methods to check and assist with the level and alignment of the lining off:

   1. spirit level                     
   2. laser level                   
   3. water line                     
   4. plumb line
   5. measuring tools/devices

7. Produce marked out components which meet all of the following:

   1. company/customer standards and codes of practice
   2. dimensionally accurate (to drawing or specification)
   3. clearly defined for required processes
   4. uses recognised marking out conventions

8. Complete the relevant documentation in line with organisational procedures, to include one from the following and pass it to the appropriate people:

   1. build records
   2. log cards
   3. job cards
   4. quality documentation
   5. other specific recording methods

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Behaviours:

You will be able to apply the appropriate behaviours required in the workplace to meet the job profile and overall company objectives, such as:

• strong work ethic
• positive attitude
• team player
• dependability
• responsibility
• honesty
• integrity
• motivation
• commitment

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3

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2021

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Current

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Original

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Semta

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SEMME3152

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Marine Engineering Trades

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2122

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engineering; marine; marking out; fabrication; metalwork; sheet; plate; section; materials; equipment; methods

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