- OKAY GUYS TODAY'S TOPIC IS " JOINTS IN CARPENTRY"
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INTRODUCTION
Timber is obtained in the form of rough sleepers or beams. It is cut accordingly to the required sizes and different constructional details made out of it. In the construction of a building timber is used in two forms. Firstly it is used for tim mlbering of trenches, scaffordings, shorings, centering for arche, form work for R.C.C. structural member, etc . Timber used for such purposes is roughly cut and fitted into the required form without involving much labour. Secondly wood is finely cut and fitted or joined in a systematic way to give accurate and durable shape to different wooden structural members. This needs a specially skilled carpenter and thus involves costly labour. Such a timber is used for making wooden trusses , doors, windows, almirahs, ventilators , wall panelling, etc.
TIMER JOINTS
The technique of sawing , preparing and joining different pieces of timber to form an object of the required size, shape and finish is known as timber joint.
The different pieces of wood are either joined by nails and screws or by grooving and tennoning. Timber pieces are first sawn and then joined together , thus they make joint as the weakest part of a structural member. It is , therefore very important that proper care should taken while making such joints.
CLASSIFICATION OF JOINT.
- LENGTHENING OR LONGITUDINAL JOINTS.
- BEARING JOINTS.
- FRAMING JOINTS
- OBLIQUE JOINTS
- CORNER OR ANGLE JOINTS
- WIDENING JOINTS
- JOINTS USED IN DOORS, WINDOWS AND ALMIRAH.
Lengthening or Longitudinal joints
It is not always possible to get pieces of full lengths timber for structural members. So two or more pieces are joined together to get the required length. Joints which are thus used for lengthening ties, struts and other member subjected to bending are called lengthening joints. Lap joints, fished joints, scarfed or spliced joints and tabled joints are its different types.
Bearing joints
These joints are used to join different pieces which are to bear push and pulls. Mortoise and tenon joints, halved housed and dove tail joints are some of its types
Oblique joints
When inclined members like braces or rafters are to be fixed to horizontal members. The oblique joints are used.
Widening joints
For increasing the width of the board or planks by joining them edge to edge , these joints are used. Battens of doors, panels for doors and windows are widened by providing such joints.
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