Download - 23 joints
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WOOD MATERIALS TECHNOLOGY
4th Edition
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Chapter 23Joints
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Wood jointsDisadvantages
− Time-consuming− Require skill – difficult to make− Special tools needed
Advantages− Give strength− Long lasting− Decorative− Resist forces well
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Butt joints
• Simple joints• Need nails or screws• Rebate will give strength• Greater glue area
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Butt joints – joining boards
Simple edge joints used for making wide boardsCan be strengthened using biscuit joints or tonguesBoards arranged with alternating end grain to prevent warping
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Edge joints
Simple joints Join narrow boards together
to make wider boardsStrengthened with
– Tongue & groove– Loose tongues– Biscuit joint
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Halving joints
The two halves of the joint make up the full thickness
Uses– Frames– Rails
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Housing joints
Uses – Shelved units – Dividers for boxes
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Bridle joints
Uses– Frames– Doors– Making tables– Making chairs
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More bridle joints
Uses– Frames– Doors– Making tables– Making chairs
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Finger joint
Large glue areaCommon jointOdd number of fingers
Uses– Joining corners of frames
and boxes– Cabinet construction
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Mortise and tenon joints
Widely used Large glue area gives strengthA number of different types
Uses– Frames – Doors– Tables & chairs
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Mortise and tenon joints
Barefaced mortise and tenon joint– Barefaced tenon has
only one shoulder
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Mortise and tenon joints
• Stopped mortise and tenon joint
• Wedged mortise and tenon joint
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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
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• Haunched mortise and tenon joint
Mortise and tenon joints
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Slope of the dovetail
Softwood Hardwood
1 : 6 1 : 8
Dovetail jointsStrong jointAttractive Dovetail tightens when a
pulling force is applied
Use– Drawers
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Slope of the dovetail
Softwood Hardwood
1 : 6 1 : 8
Slope of dovetail joints
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Dovetail joints
Tee dovetail halving joint
Single through dovetail joint
Uses– Corners of boxes– Where rails meet legs
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Through dovetail jointUses
– Box carcases– Drawer carcases
Dovetail jointsLapped dovetail jointUsed
– Where strength is needed, but the front end grain of the tails has to be hidden
– Drawer fronts
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Screws
Screws are used to hold a joint together
First, a pilot hole is drilled and then countersunk
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Screws and plugs
Screw is hidden with a round wooden plug
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Joint blockAllow pieces to be taken apartNot very strong or attractive
Knock-down fitting Wooden blocks can also be made to do the same thing
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Mitre jointA simple form of joint that can be strengthened with loose
tongues, biscuits or dowels
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Dowel joint
Used in place of mortise and tenon
Dowel is a wooden cylinder
A dowelling jig is used
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Example
Example 1Describe a suitable method of joining the rail ‘R’ to the leg ‘L’
on the table pictured in the diagram.
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Example 2 In the unit shown, describe a
suitable method of joining:
A
S
A
B− Base B to side A with
finger joints
− Shelf S to side A using a housing joint
− Side A to the shelf S− Base B to side A
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Quiz
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Name the joints
− Twin mortise and tenon− Barefaced mortise and tenon
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Name the joints
− Finger joint− Tee dovetail halving
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A
B
Tail
Pins
Dowel
Name the parts shown
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Name the joints
− Lapped dovetail− Stopped housing joint
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Haunch
Name the part shown