CARPENTRY JOINTS

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CARPENTRY JOINTS

• Carpentry joint are joints between two wooden
  pieces .
• Some wood joints employ fasteners, bindings, or
  adhesives, while others use only wood elements
• Characteristics of wooden joints - strength,
  flexibility, toughness , appearance, etc. -
  derive from the properties of the joining
  materials and from how they are used in the
  joints

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Carpentry Joints

• Traditional timber joints
• Non traditional timber joints

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TYPES of JOINTS

• Lengthening Joint
• Widening Joint
• Bearing Joint
• Framing Joint
• Angle or Corner Joint
• Oblique Shoulder Joint

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LENGTHENING JOINT

• LAP JOINT
• Used extensively in construction and
  cabinetry for framing.
• Quick and easy to make and provide reasonable
  strength through good gluing surface.
• They may be reinforced with dowels or mechanical
  fasteners to resist twisting.

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LENGTHENING JOINT

• FISHING JOINT
• Wooden or iron fish plates are placed on opposite
  faces and secured by passing bolt through them.
• Ends of the fish plates are slightly bent and
  pressed into the member.

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LENGTHENING JOINT

• SCARFED JOINT
• Projection are made in the end of one piece and
  corresponding depressions are formed in the other
  piece.
• The two pieces are then secured together by metal
  straps, bolts, fish plates and keys.

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LENGTHENING JOINT

• TABLED JOINT
• For members subjected to both tension as well as
  compression.

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WIDENING JOINTS

• BUTT Joint
• End are butted together. Usually glued or
  nailed together. Its weakest joint.

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WIDENING JOINTS

• DOVETAILED JOINT
• Uses dovetail shaped key to fit in corresponding
  grooves.

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WIDENING JOINTS

• TONGUE AND GROOVE joint
• A method of fitting similar objects together,
  edge to edge.
• Used mainly with wood flooring, parquetry,
  paneling, and similar constructions.
• Tongue and groove joints allow two flat pieces to
  be joined strongly together to make a single flat
  surface.

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BEARING JOINTS

• DOVE TAIL joint
• Its a form of box joint where the fingers
  are locked together by diagonal cuts.
• The sides of each half of the joint are cut at an
  angle of about 30 degrees so that when the joint
  is assembled , the separate pieces are locked
  together.
• Stronger then lap or butt joint .

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BEARING JOINT

• BOX joint
• The strength of a finger joint comes from the
  long-grain to long-grain contact between the
  fingers, which provides a solid gluing surface.
• Number of contact points also allows for more
  gluing surface as opposed to a butt joint.
• The joint is made by cutting a set of
  complementary rectangular cuts in two pieces of
  wood, which are then glued.
• To visualize a box joint simply interlock the
  fingers of your hands at a ninety degree angle

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BEARING JOINT

• MORTISE and TENON joint
• The mortise and tenon joint i is simple and
  strong.
• The tenon is formed to the end of a member
  generally referred to as a rail and is inserted
  into a square or rectangular hole cut into the
  corresponding member. The tenon is cut to fit the
  mortise hole exactly and usually has shoulders
  that seat when the joint fully enters the mortise
  hole.
• The joint may be glued, pinned, or wedged to
  lock it in place.

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BEARING JOINT

• HALVED JOINT
• Angle Halved
• Beveled Halved
• Dovetailed Halved
• Longitudinal Halved
• Tee Halved

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BEARING JOINTS

• Notched Joint

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OBLIQUE JOINT

• BIRDSMOUTH joint
• It us used in roof construction. A V-shaped cut
  in the rafter connects the rafter to the
  wall-plate .

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OBLIQUE JOINT

• Used where members to be joined meet at acute or
  obtuse angle. Ex. Timber trusses

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ANGLE JOINT

• Used to Join corners of frame
• Butt joint
• Grooved tongued
• Plain Mitred
• Mitred Feathered
• Shoulder Housed
• Dovetailed Housed
• Housed Tongue Groove mitred

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CARPENTRY JOINTS

• Traditional methods of improvement.
• Dowel A small rod is used internal to a joint to
  both help align on glue up and permanently
  strengthen the joint. Traditional joints are used
  with natural timbers as they do not need any
  other materials other than the timber itself. for
  example Butt joints.

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