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JOINTS TOPIC 3 EXTRA… CLICK HERE FOR MORE ON A TOPIC INDUSTRIAL TECHNOLOGY- TIMBER ASSOCIATED THEORY.

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Presentation on theme: "JOINTS TOPIC 3 EXTRA… CLICK HERE FOR MORE ON A TOPIC INDUSTRIAL TECHNOLOGY- TIMBER ASSOCIATED THEORY."— Presentation transcript:

1 JOINTS TOPIC 3 EXTRA… CLICK HERE FOR MORE ON A TOPIC INDUSTRIAL TECHNOLOGY- TIMBER ASSOCIATED THEORY

2 INDEX INTRODUCTION THE ROLE OF ADHESIVES CARCASE JOINTS DOVETAIL JOINTS HOUSING JOINTS FRAMING JOINTS MORTISE & TENON JOINTS WIDENING JOINTS BISCUIT JOINTS KNOCK DOWN FITTINGS Click on a topic or press Enter to commence.

3 In the process of making useful articles from lengths of timber it becomes necessary to join the lengths in a number of ways. This may involve joining timber side by side, at a right angle, or even to meet a curved surface. Carpenters and woodworkers have always sought ways to achieve this in the most efficient manner without compromising strength or appearance. Whilst nails and screws can be used to join timber their appearance is often unsightly, and is usually nowhere near the strength of the original material. JOINTS INDEX

4 With the advent of modern adhesives, with their increased ………………………..and ………………………… there is less dependence upon strength from the joint itself. This has led to an increase in simpler joints being used more frequently, or the greater use of machines to produce the joints. JOINTS strength ease of application THE ROLE OF ADHESIVES INDEX

5 Many joints achieve their strength simply through the increase in …………………… However the choice of a joint will always rely on the balance between ……………, ……………………… & complexity to produce the joint. JOINTS surface area appearance, strength, THE ROLE OF ADHESIVES INDEX

6 Carcass joints are associated with ……….. like constructions and have members joining usually at ……………… angles. The two types of carcass joints are ……………. and …………………..carcass joints. JOINTS box right corner CARCASE JOINTS divisional The following slides illustrate the most common joints and their typical applications INDEX

7 JOINTS CARCASE JOINTS Butt Joint Can be strengthened with nails or screws INDEX

8 JOINTS CARCASE JOINTS Butt Joint Can be strengthened with nails or screws EXTRA… INDEX

9 JOINTS CARCASE JOINTS Butt joints joints in framing may also be strengthened by fixing a nail plate or corrugated fastener over the outside, or a timber block may be fixed to the inside. INDEX

10 JOINTS CARCASE JOINTS Rebate & butt joint Reduced end grain showing Increased surface area for gluing EXTRA… INDEX

11 JOINTS CARCASE JOINTS This may also be known as the “rabbit” “rabbit” joint INDEX

12 JOINTS CARCASE JOINTS Mitre Joint Can Can be strengthened by nails, or screws or…… INDEX

13 JOINTS CARCASE JOINTS A spline A spline may be added to strengthen the joint. EXTRA… INDEX

14 JOINTS CARCASE JOINTS Mitre Joints are typically used in picture framing INDEX

15 JOINTS CARCASE JOINTS Dowel Joint. Dowel Joint. It is another way to strengthen the simple butt joint. The pins The pins, or dowels should be approx 1/3 of the thickness of the timber The number The number of pins depends on the width of the timber. INDEX

16 JOINTS CARCASE JOINTS-Dovetail Joints These are are the strongest of all carcase joints and are used in the manufacture of high quality furniture. They can be time-consuming and difficult to make, but can be manufactured en masse with the use of a special ………………………..jig. dovetailing EXTRA… INDEX

17 JOINTS Dovetail jigs are often used with a router. INDEX

18 JOINTS CARCASE JOINTS-Dovetail Joints Single Dovetail. INDEX

19 JOINTS CARCASE JOINTS-Dovetail Joints Common or through dovetail joint. INDEX

20 JOINTS CARCASE JOINTS-Dovetail Joints Lapped dovetail joint. End grain only shows from one direction Advantage over through dovetail INDEX

21 JOINTS Dovetail joint applications INDEX

22 JOINTS Dovetail joint applications INDEX

23 JOINTS INDEX

24 JOINTS Housing Joints These joints consist of one member fitting into a trench on the face of the second member. The depth of the trench is equal to……… Approximately 1/3 the depth of the timber Through housing INDEX

25 JOINTS Housing Joints Stopped housing Advantage:- The joint cannot be seen when it has been assembled. INDEX

26 JOINTSHousing Joints The stopped housing joint is typically used in bookcase construction construction, and can be strengthened with dowels or screws. EXTRA… INDEX

27 JOINTS Housing Joints A dovetail housing joint is very strong, but may be difficult to construct. INDEX

28 JOINTS Framing Joints Tee Halving Joint INDEX

29 JOINTS Framing Joints Cross Halving Joint INDEX

30 JOINTS Framing Joints Corner Halving Corner Halving Joint This joint may be strengthened with dowels…. or screws. INDEX

31 JOINTS Framing Joints Which variation of the halving joint is the strongest?…………………………… Why?………………………………… What is the most accurate method for marking out joints?…………………………….. the dovetail halving The tail acts as a wedge With a marking knife INDEX

32 JOINTS The unsightly end grain is not seen with a mitre joint INDEX

33 JOINTS Mortise & Tenon Joints These are the strongest framing joints and are used where considerable loads are applied. Typical examples include Tables, chairs, beds and furniture subject to dynamic loads. INDEX

34 JOINTS Mortise & Tenon Joints INDEX

35 JOINTS Mortise & Tenon Joints Joint can be constructed on any angle INDEX

36 JOINTS Mortise & Tenon Joints When the mortise is cut right through the timber and the tenon appears on the other side it is known as a Through Mortise & Tenon INDEX

37 JOINTS Mortise & Tenon Joints A Haunched Mortise & Tenon joint does not pass all the way through the timber, (about 2/3), and may have a shoulder if it is at the corner. Advantage: Advantage: After assembly the joint is invisible from the end. INDEX

38 JOINTSWidening Joints Widening joints joints are used to make slabs of solid timber that are wider than is normally available. The most most common widening joint is the simple butt joint. It can can be strengthened by using dowels or biscuits. INDEX

39 JOINTS Several boards have been joined edge to edge, or “laminated”, to form this table top. Suggest a suitable joining method. INDEX

40 JOINTS Butt joint INDEX

41 JOINTS dowel joint INDEX

42 JOINTS Tongue & groove joint Tongue & groove joint is common in flooring, but may also be used as a widening joint INDEX

43 JOINTS These These are some variations of the tongue & groove joint INDEX

44 JOINTS Biscuit joint INDEX

45 JOINTS Biscuit joints Biscuit joints can be used as carcase joints as well and are popular because they are easy to construct with a biscuit joining machine. The The slot is cut on each member with the machine. The The biscuit is inserted with glue. The The joint is clamped together. Construction Steps INDEX

46 JOINTS Knock Down Fittings These These specialist pieces of hardware have been developed to enable furniture to be assembled on site or by the consumer after purchase of the item in a compact packaged state. What other advantages are there of knock down fittings? The project can be disassembled for storage or transport. INDEX

47 JOINTS Knock Down Fittings What What are the disadvantages of Knock down furniture? Specialist tools may be needed to fit them. Sometimes they look unsightly. The following knockdown fittings are readily available from specialist shops, and the list is growing…….. INDEX

48 JOINTS Cam lock or Pin and cam assembly. INDEX

49 JOINTS Connecting block Threaded insert INDEX

50 JOINTS Cross dowels, used in chair construction INDEX

51 JOINTS Connector bolt. INDEX

52 JOINTS Shelf Support. INDEX

53 JOINTS Pin and cam assembly with plastic cap INDEX

54 JOINTSThe end of Topic 3 INDEX


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