(PDF) Temporary - Penyrheol Comprehensive · PDF fileTemporary Permanent Nuts, Bolts And Washers ... Disadvantages an work loose ... porary but study. terials e.g. plastic to wood Advantages - DOKUMEN.TIPS (2023)

3.3 JOINING METHODS GCSE RESISTANT MATERIALS @PENYRHEOLDT

Joining Methods

Temporary

Permanent

Nuts, Bolts

And Washers

Nails

Mortise And

Tenon Joint

Knock Down

Fitting

Tapping And

Threading

Screws

Rebate Joint

Housing Joint

Butt Joint

Halving Joints

Dowel Joint Soft Soldering

Brazing

Welding

Rivets

Arc Welding

(MMA)

Mig

Tig

Oval Wire

Round Wire

Panel Pin

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Temporary

3.3 JOINING METHODS GCSE RESISTANT MATERIALS @PENYRHEOLDT

JOINING METHODS FACTSHEET

Tapping And Threading

Uses

For creating thread either ex-

ternal or internal depending

on application

Advantages

Allows bolts to be used where a

temporary fixing may be required

Can be used in plastic and metal

Can be used to restore damaged

threads

Allows for nuts to be used as a

temporary fixing if required

Thread size can be varied by ad-

justing pinch bolts on the die stock

Disadvantages

If dies are not set square you

will get a drunken thread

Smaller sizes break easily if

not used correctly

Clogs up easily due to swarf

build up

Can be difficult to start

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Nuts, Bolts And Washers

Uses

Nuts and bolts provide a tem-

porary fixing and a convenient

method of securing parts that

can be easily be undone

Advantages

Can be undone so items can

be taken apart

Come in various lengths and

sizes

Lock nuts can be used for firm

fixings

Disadvantages

Can work loose with vibration

If correct size spanner is not

used you can round the head

Can become cross threaded

damaging the threads

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Screws Uses

Screws offer a reliable and

neat method of fixing wood

metal and plastic. The can be

removed making them a tem-

porary but study.

Advantages

Can be easily removed

Some new screw do not need pilot

holes or clearances

Can be used to joint dissimilar ma-

terials e.g. plastic to wood

Disadvantages

Steel screws will rust if outside

Some screws can be hard to remove

It is difficult to get screws out if the

shear off

If holes are not correctly prepared, screws

can split material when inserted

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Knock down fittings

Uses

There are many knock down

joining methods, all of which

allow joints to be made quick-

ly and easily.

The parts can be taken apart

easily and quickly, so the

whole construction can be

knocked down or flat

packed for easy transporta-

tion

Advantages

Allows larger assembly to be

transported

Can be taken apart multiple times

Parts interchangeable

Disadvantages

Can some times make things

unstable

Not the greatest of weight

bearing joint.

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Permanent

3.3 JOINING METHODS GCSE RESISTANT MATERIALS @PENYRHEOLDT

JOINING METHODS FACTSHEET

Round Wire Nail

Uses

Nails are a quick method of

joining wood. As nails are

driven into wood, they grip by

forcing the fibres of the wood

away from the head. This

makes them difficult to with-

draw

A general Rule when using

nails is nail length should be

three times the width of the

wood being joined

Advantages

Big flat head makes it easy to

hit

Sometimes serrated which

helps them grip

Disadvantages

Longer nails can bend when

being hit

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Oval Wire Nail

Uses

Nails are a quick method of

joining wood. As nails are

driven into wood, they grip by

forcing the fibres of the wood

away from the head. This

makes them difficult to with-

draw

A general Rule when using

nails is nail length should be

three times the width of the

wood being joined

Advantages

Can be punched below the

surface and the hole filled

Disadvantages

Very difficult to get out as the

head is below the surface

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Panel Pin

Uses

Nails are a quick method of

joining wood. As nails are

driven into wood, they grip by

forcing the fibres of the wood

away from the head. This

makes them difficult to with-

draw

A general Rule when using

nails is nail length should be

three times the width of the

wood being joined

Advantages

Small heads can be punched

below the surface with a nail

punch

Disadvantages

Bend more easily due to their

thinness

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Wood Joints

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Halving Joint

Description

Halving joints are made by

cutting away half the thick-

ness of the material on each

half of the joint. Having joints

can be used on corners, tees,

or for cross halving.

Advantages

Stronger than butt joints

Can be strengthened easily by

adding dowels

Disadvantages

Accuracy must be maintained

to archive a perfect finish

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Butt Joint

Description

Butt joints are the simplest

form of joint and the weakest

since the only have a small

gluing area, which means they

can be pulled apart. They are

used in cheap furniture and

sometimes have dowels add-

ed to reinforce them.

Advantages

Cheap

Most simple joint

Can be strengthen relatively easily

Disadvantages

Weak due to small gluing area

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Rebate Joints

Description

Rebate joints are also know as

lap joints. One part of the two

pieces being joined is left

plain and the other has a re-

bate cut into it, which means

that half the thickness of the

material is removed to form a

lip

Advantages

Stronger than a butt joint due to a

larger gluing area and weight

bearing lip

Disadvantages

Still potentially weak to cer-

tain forces

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Housing Joint

Description

Housing joints can be cut in to

natural timber and manufac-

tured boards. They are com-

monly used in the construc-

tions of cabinet work for

shelves or dividers

Advantages

Provide a neat finish for

shelves

Weight bearing

Disadvantages

Difficult may be experienced

in getting both sides exactly

level for a shelf

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Mortice and tenon joint

Description

Mortise and tenon joints are

widely used in the construc-

tion of furniture frames. The

mortise is marked out with a

mortise gauge and cut with a

mortise chisel. The width of

the tenon should be one third

the width of the timber.

Advantages

Strong Joint

Neat

Disadvantages

If not accurately cut out the

tenon may float creating an

unstable frame.

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Dowel joint

Description

Dowel joints are butt joints

with dowels used as reinforce-

ments. Dowels are made from

beech or ramin. Holes are

drilled in both pieces and glue

is used to secure the dowels

inn place and between the

joining surfaces.

Advantages

Cheap reinforcement method

Two or more dowels will pre-

vent work pieces rotating if

glue cannot be applied

Disadvantages

Relatively weak

If holes are drill accurately the

two mating surfaces will not

match up

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Metal Joints

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Snap riveting

Description

Rivets are most commonly

used in sheet metal, although

they can als