Monday, August 24, 2020

JOINTS IN CARPENTRY

  1.  OKAY  GUYS  TODAY'S TOPIC IS " JOINTS IN  CARPENTRY"


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  • INTRODUCTION
  • JOINTS 
  •  CLASSIFICATION OF JOINTS

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

Dove tail joint



Framed joints

      These joints are especially used for joining different members  of door frames and leaves. Various  horizontal  and vertical members of a leaf are joined together by using these joints. 

 

                           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.

Corner joint

These joints are used to join different members at right angle. Borders or wooden boards, mount of boards etc. are joined with these joints.

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