CARPENTRY JOINTS

BTM I Ar. Suvarna Tamhane

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

Carpentry Joints

Traditional timber joints

Non traditional timber joints


TYPES of JOINTS

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


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.


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.


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.


LENGTHENING JOINT

TABLED JOINT• For members

subjected to both tension as well as compression.


WIDENING JOINTS

BUTT Joint End are butted

together. Usually glued or nailed together. It’s weakest joint.


WIDENING JOINTS DOVETAILED JOINT• Uses dovetail

shaped key to fit in corresponding grooves.


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.


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 .


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


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.


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

Halved• Tee Halved


BEARING JOINTS Notched Joint



OBLIQUE JOINT

BIRDSMOUTH joint

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

OBLIQUE JOINT Used where

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


ANGLE JOINT Used to Join

corners of frame• Butt joint• Grooved & tongued• Plain Mitred• Mitred &Feathered• Shoulder Housed • Dovetailed Housed• Housed Tongue

&Groove &mitred


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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Documents

CARPENTRY JOINTS