CARPENTRY JOINTS o Carpentry joint are joints between

CARPENTRY JOINTS o Carpentry joint are joints between two wooden pieces. o 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 o BTM I Ar. Suvarna Tamhane

Carpentry Joints o Traditional timber joints o Non traditional timber joints BTM I Ar. Suvarna Tamhane

TYPES of JOINTS o o o Lengthening Joint Widening Joint Bearing Joint Framing Joint Angle or Corner Joint Oblique Shoulder Joint BTM I Ar. Suvarna Tamhane

LENGTHENING JOINT o 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. BTM I Ar. Suvarna Tamhane

LENGTHENING JOINT o 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. BTM I Ar. Suvarna Tamhane

LENGTHENING JOINT o 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. BTM I Ar. Suvarna Tamhane

LENGTHENING JOINT o TABLED JOINT • For members subjected to both tension as well as compression. BTM I Ar. Suvarna Tamhane

WIDENING JOINTS o BUTT Joint End are butted together. Usually glued or nailed together. It’s weakest joint. BTM I Ar. Suvarna Tamhane

WIDENING JOINTS o DOVETAILED JOINT • Uses dovetail shaped key to fit in corresponding grooves. BTM I Ar. Suvarna Tamhane

WIDENING JOINTS o 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. BTM I Ar. Suvarna Tamhane

BEARING JOINTS o 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. BTM I Ar. Suvarna Tamhane

BEARING JOINT o 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 BTM I Ar. Suvarna Tamhane

BEARING JOINT o • • • 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. BTM I Ar. Suvarna Tamhane

BEARING JOINT HALVED JOINT Angle Halved Beveled Halved Dovetailed Halved Longitudinal Halved • Tee Halved o • • BTM I Ar. Suvarna Tamhane

BEARING JOINTS o Notched Joint BTM I Ar. Suvarna Tamhane

OBLIQUE JOINT o BIRDSMOUTH joint It us used in roof construction. A Vshaped cut in the rafter connects the rafter to the wall-plate. BTM I Ar. Suvarna Tamhane

OBLIQUE JOINT o Used where members to be joined meet at acute or obtuse angle. Ex. Timber trusses BTM I Ar. Suvarna Tamhane

ANGLE JOINT o Used to Join corners of frame • Butt joint • Grooved & tongued • Plain Mitred • Mitred &Feathered • Shoulder Housed • Dovetailed Housed • Housed Tongue &Groove &mitred BTM I Ar. Suvarna Tamhane

CARPENTRY JOINTS o 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. BTM I Ar. Suvarna Tamhane

CARPENTRY JOINTS BTM I Ar. Suvarna Tamhane