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23 joints

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23 joints

  1. 1. WOOD MATERIALS TECHNOLOGY 4th Edition
  2. 2. Chapter 23 Joints
  3. 3. Wood joints  Advantages − Give strength − Long lasting − Decorative − Resist forces well  Disadvantages − Time-consuming − Require skill – difficult to make − Special tools needed
  4. 4. Butt joints • • • • Simple joints Need nails or screws Rebate will give strength Greater glue area
  5. 5. Butt joints – joining boards  Simple edge joints used for making wide boards  Can be strengthened using biscuit joints or tongues  Boards arranged with alternating end grain to prevent warping
  6. 6. Edge joints  Simple joints  Join narrow boards together to make wider boards  Strengthened with – Tongue & groove – Loose tongues – Biscuit joint
  7. 7. Halving joints  The two halves of the joint make up the full thickness  Uses – Frames – Rails
  8. 8. Housing joints  Uses – Shelved units – Dividers for boxes
  9. 9. Bridle joints  Uses – Frames – Doors – Making tables – Making chairs
  10. 10. More bridle joints  Uses – Frames – Doors – Making tables – Making chairs
  11. 11. Finger joint  Large glue area  Common joint  Odd number of fingers  Uses – Joining corners of frames and boxes – Cabinet construction
  12. 12. Mortise and tenon joints  Widely used  Large glue area gives strength  A number of different types  Uses – Frames – Doors – Tables & chairs
  13. 13. Mortise and tenon joints  Barefaced mortise and tenon joint – Barefaced tenon has only one shoulder
  14. 14. Mortise and tenon joints • Stopped mortise and tenon joint • Wedged mortise and tenon joint
  15. 15. Mortise and tenon joints  Twin mortise and tenon joint – Greater glue area and a stronger joint – Used when a wide tenon could become loose with shrinkage
  16. 16. Mortise and tenon joints • Haunched mortise and tenon joint
  17. 17. Dovetail joints  Strong joint  Attractive  Dovetail tightens when a pulling force is applied  Use – Drawers Slope of the dovetail Softwood Hardwood 1:6 1:8
  18. 18. Slope of dovetail joints Slope of the dovetail Softwood Hardwood 1:6 1:8
  19. 19. Dovetail joints  Single through dovetail joint  Uses – Corners of boxes – Where rails meet legs  Tee dovetail halving joint
  20. 20. Dovetail joints  Through dovetail joint  Uses – Box carcases – Drawer carcases  Lapped dovetail joint  Used – Where strength is needed, but the front end grain of the tails has to be hidden – Drawer fronts
  21. 21. Screws  Screws are used to hold a joint together  First, a pilot hole is drilled and then countersunk
  22. 22. Screws and plugs  Screw is hidden with a round wooden plug
  23. 23. Joint block  Allow pieces to be taken apart  Not very strong or attractive  Knock-down fitting  Wooden blocks can also be made to do the same thing
  24. 24. Mitre joint  A simple form of joint that can be strengthened with loose tongues, biscuits or dowels
  25. 25. Dowel joint  Used in place of mortise and tenon  Dowel is a wooden cylinder  A dowelling jig is used
  26. 26. Example 1  Describe a suitable method of joining the rail ‘R’ to the leg ‘L’ on the table pictured in the diagram. Example
  27. 27. Example 2  In the unit shown, describe a suitable method of joining: − Side A to the shelf S − Base B to side A − Shelf S to side A using a housing joint A S A B − Base B to side A with finger joints
  28. 28. Quiz
  29. 29.  Name the joints − Barefaced mortise and tenon − Twin mortise and tenon
  30. 30.  Name the joints − Tee dovetail halving − Finger joint
  31. 31.  Name the parts shown Dowel Tail A B Pins
  32. 32.  Name the joints − Stopped housing joint − Lapped dovetail
  33. 33.  Name the part shown Haunch

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