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Unit 115: Produce woodworking joints

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Timber conversion

Education
1 of 11
Level 1 Diploma in Carpentry and Joinery 1 of 11© 2013 City and Guilds of London Institute. All rights reserved. Timber conversion Unit 115: Produce woodworking joints
Level 1 Diploma in Carpentry and Joinery 2 of 11© 2013 City and Guilds of London Institute. All rights reserved. Aims and objectives Aim: Introduce learners to timber conversion. Objectives: • Identify at least two methods of timber conversion. • Sketch through-and-through timber conversion. • State the method of conversion for carcassing timber.
Level 1 Diploma in Carpentry and Joinery 3 of 11© 2013 City and Guilds of London Institute. All rights reserved. Timber conversion The way the cuts are made will depend on several factors, including: • The type of sawing machine. • The size of log (diameter of girth). • The condition of the log. • The wood species. • Economy. • The end use of the resulting timber – for its appearance, decorative or structural requirements.
Level 1 Diploma in Carpentry and Joinery 4 of 11© 2013 City and Guilds of London Institute. All rights reserved. Timber conversion The resulting timber section (with the exception of that which surrounds the pith-heart) will be either: • Plain or tangential sawn or • Quarter or rift sawn
Level 1 Diploma in Carpentry and Joinery 5 of 11© 2013 City and Guilds of London Institute. All rights reserved. Through-and-through Large logs can be quickly converted in this way. It is cheap in comparison to other methods. The resulting timber will be part plain sawn and part quarter sawn. Pith or heart
Level 1 Diploma in Carpentry and Joinery 6 of 14© 2013 City and Guilds of London Institute. All rights reserved. Quarter (radial) or rift sawn Quarter or rift sawn can be wasteful and expensive, but is necessary where a large number of radial, or near radial, sawn boards are required. Certain hardwoods cut in this way can produce beautiful figured boards, eg oak. Quarter sawn boards retain their shape much better than plain sawn boards and will shrink less in service, making them suitable for good class joinery work and quality decking for floors.
Level 1 Diploma in Carpentry and Joinery 7 of 14© 2013 City and Guilds of London Institute. All rights reserved. Quarter (radial) or rift sawn Pith or heart
Level 1 Diploma in Carpentry and Joinery 8 of 11© 2013 City and Guilds of London Institute. All rights reserved. Tangential sawn • Logs cut in this way will, with the exception of the heart (centre portion of the log) section, provide timber with a tangential face. • This method of conversion is used when cutting up large diameter logs of hardwood or softwood. • Timber produced by this method has a structural strength which makes it ideal for use as beam or floor joists. • Boards produced by this method of sawing are also likely to shrink a great deal.
Level 1 Diploma in Carpentry and Joinery 9 of 14© 2013 City and Guilds of London Institute. All rights reserved. Tangential sawn Pith or heart
Level 1 Diploma in Carpentry and Joinery 10 of 11© 2013 City and Guilds of London Institute. All rights reserved. Aims and objectives Aim: Introduce learners to timber conversion. Objectives: • Identify at least two methods of timber conversion. • Sketch through-and-through timber conversion. • State the method of conversion for carcassing timber.
Level 1 Diploma in Carpentry and Joinery 11 of 11© 2013 City and Guilds of London Institute. All rights reserved. Any questions?

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Unit 115: Produce woodworking joints

  • 1. Level 1 Diploma in Carpentry and Joinery 1 of 11© 2013 City and Guilds of London Institute. All rights reserved. Timber conversion Unit 115: Produce woodworking joints
  • 2. Level 1 Diploma in Carpentry and Joinery 2 of 11© 2013 City and Guilds of London Institute. All rights reserved. Aims and objectives Aim: Introduce learners to timber conversion. Objectives: • Identify at least two methods of timber conversion. • Sketch through-and-through timber conversion. • State the method of conversion for carcassing timber.
  • 3. Level 1 Diploma in Carpentry and Joinery 3 of 11© 2013 City and Guilds of London Institute. All rights reserved. Timber conversion The way the cuts are made will depend on several factors, including: • The type of sawing machine. • The size of log (diameter of girth). • The condition of the log. • The wood species. • Economy. • The end use of the resulting timber – for its appearance, decorative or structural requirements.
  • 4. Level 1 Diploma in Carpentry and Joinery 4 of 11© 2013 City and Guilds of London Institute. All rights reserved. Timber conversion The resulting timber section (with the exception of that which surrounds the pith-heart) will be either: • Plain or tangential sawn or • Quarter or rift sawn
  • 5. Level 1 Diploma in Carpentry and Joinery 5 of 11© 2013 City and Guilds of London Institute. All rights reserved. Through-and-through Large logs can be quickly converted in this way. It is cheap in comparison to other methods. The resulting timber will be part plain sawn and part quarter sawn. Pith or heart
  • 6. Level 1 Diploma in Carpentry and Joinery 6 of 14© 2013 City and Guilds of London Institute. All rights reserved. Quarter (radial) or rift sawn Quarter or rift sawn can be wasteful and expensive, but is necessary where a large number of radial, or near radial, sawn boards are required. Certain hardwoods cut in this way can produce beautiful figured boards, eg oak. Quarter sawn boards retain their shape much better than plain sawn boards and will shrink less in service, making them suitable for good class joinery work and quality decking for floors.
  • 7. Level 1 Diploma in Carpentry and Joinery 7 of 14© 2013 City and Guilds of London Institute. All rights reserved. Quarter (radial) or rift sawn Pith or heart
  • 8. Level 1 Diploma in Carpentry and Joinery 8 of 11© 2013 City and Guilds of London Institute. All rights reserved. Tangential sawn • Logs cut in this way will, with the exception of the heart (centre portion of the log) section, provide timber with a tangential face. • This method of conversion is used when cutting up large diameter logs of hardwood or softwood. • Timber produced by this method has a structural strength which makes it ideal for use as beam or floor joists. • Boards produced by this method of sawing are also likely to shrink a great deal.
  • 9. Level 1 Diploma in Carpentry and Joinery 9 of 14© 2013 City and Guilds of London Institute. All rights reserved. Tangential sawn Pith or heart
  • 10. Level 1 Diploma in Carpentry and Joinery 10 of 11© 2013 City and Guilds of London Institute. All rights reserved. Aims and objectives Aim: Introduce learners to timber conversion. Objectives: • Identify at least two methods of timber conversion. • Sketch through-and-through timber conversion. • State the method of conversion for carcassing timber.
  • 11. Level 1 Diploma in Carpentry and Joinery 11 of 11© 2013 City and Guilds of London Institute. All rights reserved. Any questions?