Fabricating and constructing Flashcards
Describe the process of lamination
Lamination involves the gluing together of thin sheets (veneers) of timber into a curved shape. The laminating process is as follows:
- First, a former is produced.
- Veneers of wood have glue applied to them.
- The veneers are layered over the former.
- The veneers are then held in place by clamps until dry.
- The laminated timber is then removed and trimmed
Define laminating timbers
Gluing veneers of wood together.
Define veneering
A thin sheet of wood is glued to the surface of a boards to enhance its appearance.
Describe the process of veneering. What is a bag press?
Exotic hardwood veneers can be applied to manufactured timbers to enhance their appearance. The process of veneering is as follows:
- A layer of glue is applied to a manufactured board, then a decorative veneer is placed on top.
- The assembled board is put into a bag press, sealed and left until the glue has dried.
- The board is then removed from the bag press, trimmed and sanded
- A bag press is a heavy duty vacuum bad that is used to apply pressure on a product that is being glued.
Describe the process of using screws
Screws are a non-permanent method of fastening pieces of timber together. The process of screwing is:
- A pilot hole is drilled through both the top layer and the base layer of timber
- The top layer is drilled again with a clearance hole
- A countersink drill bit is used to recess the top layer.
- The screw can now screwed into joint with a screwdriver.
Are nails permanent or temporary of joining sections of timber together?
Temporary
What are the three different types of nails and how do they join timbers together?
- Nails are hammered into timber
- Round wire nails have a large flat head to prevent them pulling thin materials
- Oval nails are shaped so they are less likely to split the grain
- Panel pins are small and delicate. They are used to join thin sections of timber and boards to thicker pieces of timber.
What are the two main screw heads?
- Slotted (also known as the flat)
- Phillips (a cross shape)
What is the simple term for an adhesive?
Glue
What are the two main adhesives?
- PVA
- Contact Adhesives
What does PVA stand for?
Polyvinyl Adhesive
Evaluate the uses of PVA
- Polyvinyl Adhesive is the most common adhesive used for gluing wood to wood
- It can be used straight from the tube, is very strong and dries clear.
- It is a water based adhesive with no specific health and safety issues.
- Its main disadvantage is that it takes a relatively long time to dry.
Evaluate the uses of Contact Adhesive
- Contact Adhesive is a medium-strength glue that sticks on contact.
- It is applied in a thin layer to both surfaces and left to dry. The two surfaces are then pressed together and an instant joint is made.
- It is a solvent-based adhesive that is flammable, toxic and an irritant.
What are the 7 types of wood joints?
- Butt
- Dowel
- Lap
- Housing
- Mitre
- Mortise and Tenon
- Dovetail
Draw a butt joint
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What is the use of butt joints?
Simple frame or box construction.
What are the advantages of Butt joint?
-Easy to make
What are the disadvantages of Butt joint?
- Weak, no mechanical strength, just glue
- Not aesthestically pleasing
