TYPES OF WOODEN JOINTS

JOINERY Art of preparing internal fittings and finishing of timber- Process of joining wood pieces together

INTRODUCTION

Permanent construction

Temporary constructionCarp

entr

y

Bead

Chamfering

Groove

Ground

Housing

Mitring & scribing

Moulding

Nosing

Rebating

Sawing

Shooting

Veneering

INTRODUCTIONMaterials used for joinery Glue

Fasteners

Principles governing construction of joints

Surface of joint Even distribution of pressure

Each abutting surface Normal to line of pressure & take

maximum compressive stress

Fasteners proportioned for equal strength in relation to

the members

Fastenings should avoid shear / crushing failure

Joint should be as simple as possible

Cutting & placing of joints make minimum weakness of

members

CLASSIFICATION OF JOINTS

Lengthening joints Employed to extend the length of a member by joining

Widening joints Employed to extend the width of the boards/planks

Angle joints Employed to connect the members at ends or at right angles

Oblique shouldered joints Employed to connect members at an angle

Bearing joints Employed to give sufficient strength at the junction meeting at 90

Framing joints Employed to construct doors, windows, ventilators & partitions

STRENGTH OF TIMBER JOINTS DEPENDS ON

Area of gluing

The way in which one piece of timber encases the other

The finishing work

LENGTHENING JOINTS:

LAPPED JOINT FISHED JOINT

SCARFED JOINT

WIDENING JOINTS:

BUTT JOINT DOWELLED JOINT

TONGUE & GROOVE JOINTREBATED JOINT

ANGLE JOINTS:

Plain RebateMitre & Rebate Dovetail

Tongue & Groove

OBLIQUE-SHOULDERED JOINT

Mortise & Tenon Bridle Joint

Dovetailed joint Birdsmouth joint

BEARING JOINT

Chase-mortise joint

Cogged joint

Double tenon joint

Dovetail joint

Halved joint

Housed joint

Joggle tenon joint

Mortise & tenon joint

Notched joint

Tusk tenon joint

Q & A