DESCRIPTION AND/OR PICTURES EXPLAINING JOINT: A dowel joint is a butt joint reinforced with wooden pegs. A well-made dowel joint is as strong as a mortise and tenon joint. It is often used instead of the mortise and tenon joint if cost is a consideration in the assembly of the work. Dowel holes must be a perfect 90 degrees to the face of the work or the dowel will twist when it is assembled.
ADVANTAGES/DISADVANTAGES:
There are notable advantages associated with dowel joints. Adhesive based butt and miter dowel joints are routinely used to produce invisible joints and to reduce assembly costs in the furniture industry. However, when using common loose grained particle board, long-reach drills and special dowels must be used. Using a doweling jig and dowel centers makes producing dowel joints fairly easy. This makes them a popular choice among professional and DIY cabinet makers. Dowel joints are quickly and easily made using a dowel drill bit. This is a good joint to use for strengthening corners and to prevent twisting. For best results, choose a dowel that is fluted because this will let the glue spread evenly throughout the joint.
Strength
There are two types of stress imposed on dowel joints, sideways or “shear” stress and withdrawal stress. Dowels are usually made of yellow birch, beech or sugar maple. These woods have long, tough fibers that allow them to withstand heavy shearing loads. As for withdrawal stress, once cured, modern polyvinyl acetate (PVA) adhesives used on dowel joints make it almost impossible to pull the joint apart.
Appearance
With dowel joints, there are no unsightly dovetails, fasteners or brackets marring the appearance of fine pieces of furniture. The dowels are buried in the wood, with only a thin glue joint visible on chair legs, table legs and the sides of cabinets.
Economy
Correctly positioned dowels allow two halves of a joint to be precisely aligned without using special jigs or equipment. Consequently, tooling costs are kept to a minimum because no expensive machining, other than use of a simple twist drill, is required. Finally, dowel joints can be completed in minutes, which reduces labor costs.
Neat strong joint, providing you use strong glue Simple, quick and easy to make
haveing to make dowel joints Drilling accurate holes can be difficult
WHEN AND WHERE WOULD THIS TYPE OF JOINT BE USED?
Used to join frames, boxes, cabinets, carcases, and boards edge-to-edge or at right angles to each other. Most factory-made furniture has dowel joints, even for chair rails, which have to resist prolonged and considerable strain.
WHAT DO I NEED TO CONSTRUCT THIS TYPE OF JOINT?
Readymade dowels are available to buy pre cut to sizes. They are made from tough, strong, crack/split resistance and short grained woods like beech, birch and maple. They are designed chamfered at either end to make them easier to insert. They also have shallow glue slots, also known as grooves or flutes, machined lengthways down their sides to increase the glue area, allow space for the glue and allow air and surplus glue to escape when the dowel is tapped in. If the air and surplus glue were not allowed to escape from the glue hole as the dowel was being tapped in, there would be a build up of hydraulic pressure, which would cause the wood to split. REFERENCES: http://www.ehow.com/list_6717802_dowel-joint-advantages.html http://www.materialstechnologywood.com/practice-joints-dowel-joints.php
GROUP MEMBERS: Jake, Josh, Geoff
Dowelled Joint
DESCRIPTION AND/OR PICTURES EXPLAINING JOINT:
A dowel joint is a butt joint reinforced with wooden pegs. A well-made dowel joint is as strong as a mortise and tenon joint. It is often used instead of the mortise and tenon joint if cost is a consideration in the assembly of the work. Dowel holes must be a perfect 90 degrees to the face of the work or the dowel will twist when it is assembled.
ADVANTAGES/DISADVANTAGES:
There are notable advantages associated with dowel joints. Adhesive based butt and miter dowel joints are routinely used to produce invisible joints and to reduce assembly costs in the furniture industry. However, when using common loose grained particle board, long-reach drills and special dowels must be used. Using a doweling jig and dowel centers makes producing dowel joints fairly easy. This makes them a popular choice among professional and DIY cabinet makers. Dowel joints are quickly and easily made using a dowel drill bit. This is a good joint to use for strengthening corners and to prevent twisting. For best results, choose a dowel that is fluted because this will let the glue spread evenly throughout the joint.
Strength
Appearance
Economy
WHEN AND WHERE WOULD THIS TYPE OF JOINT BE USED?
Used to join frames, boxes, cabinets, carcases, and boards edge-to-edge or at right angles to each other. Most factory-made furniture has dowel joints, even for chair rails, which have to resist prolonged and considerable strain.
WHAT DO I NEED TO CONSTRUCT THIS TYPE OF JOINT?
Readymade dowels are available to buy pre cut to sizes. They are made from tough, strong, crack/split resistance and short grained woods like beech, birch and maple. They are designed chamfered at either end to make them easier to insert. They also have shallow glue slots, also known as grooves or flutes, machined lengthways down their sides to increase the glue area, allow space for the glue and allow air and surplus glue to escape when the dowel is tapped in. If the air and surplus glue were not allowed to escape from the glue hole as the dowel was being tapped in, there would be a build up of hydraulic pressure, which would cause the wood to split.
REFERENCES:
http://www.ehow.com/list_6717802_dowel-joint-advantages.html
http://www.materialstechnologywood.com/practice-joints-dowel-joints.php