Coat Hook Revision Notes

Aluminium was used to make the hook.

Aluminium is available in a wide variety of forms

This material was chosen because it is lightweight, easy to work and will not rust.

Aluminium

Ingots

Sheet

Rod

Bar (rectangular and square)

Extrusion

Aluminium

In the school work shop we have the following types of aluminium

Aluminium is used for: Car bodies, cookware, food wrapping foil, insulation, aircraft, greenhouses,boats, engine cylinder heads and window frames.Note: Aluminium is rarely used as a pure metal. It is mainly alloyed with copper to improve strength, eg. Duralumin which used in the production of aircraft parts.

Aluminium saucepan.

Aluminium Uses

The back piece of the coat hook was made from Medium Density Fiberboard (MDF)

MDF is available in large sheets 2440 x 1220 mm and a wide range of thicknesses 3mm – 25mm

This material was chosen because it is easy to cut, file, sand and paint

Medium Density Fiberboard

A Coping Saw was used to cut the MDF back plate to shape

The teeth on a coping saw blade should point backwards. This will help prevent blade breakages.

Remember always report a broken blade immediately to your teacher

Coping Saw

An Engineers square was used to mark lines at right angles to an edge.

Engineers square

A Scriber is used to mark out on metal

Scriber

Odd Leg Callipers are used to draw a line parallel to an edge

Odd Leg Callipers

A Countersink bit was used to countersink the back of the coat hook prior to riveting.

The Countersink bit can be used in a hand drill or Cordless drill

Hand Drill

Countersink Bit

To obtain a smooth finish on the aluminium we used a technique called Draw filing

Draw Filing

Emery Cloth was used to clean up the edges of the coat hook prior to bending the coat hook into shape

Emery Cloth

“Wet and Dry” silicon carbide paper is best used wet. This stops the paper getting clogged up

Silicon Carbide paper was used to clean the coat hook prior to bending

The Centre punch is used to mark the position of holes prior to drilling

Centre Punch

A Machine Vice is the safest way to hold the metal while drilling.

These sharp metal shavings are called Swarf

Machine Vice

The Pillar Drill was used to drill 2 holes through the Coat Hook

When using this (or any other machine) it is important to read the safety notice on the wall to make sure you understand how to use the machine safely.

When using the Pillar Drill you must

Wear GogglesTie any long hair backTuck in any loose clothing

Pillar Drill

The Pillar Drill

On / Off Switch

Drill Chuck

Chuck Guard

Chuck Key

Machine Vice

Pillar Drill

Each workstation can be fitted with an Engineers Vice.

The vice is fitted with Vice Guards. They are used to protect the work piece from the serrated jaws of the vice

Engineers Vice

A Raw Hide Mallet was used to bend the coat hook into shape.

The mallet has a soft face that will not mark the aluminium bar

Raw Hide Mallet

A Ball Pein hammer was used to rivet the two parts of the model together

Ball Pein Hammer

The small aluminium pins used to attach the coat hook to the back piece are called Rivets

Rivets“Round” or “Snap” head rivets

A Rivet Set and Snap was used to rivet the two parts together

Rivet Set & Snap

Each work station is equipped 4 files

1 Rough cut Rectangular File

1 Smooth cut Rectangular file

1 Half Round File

1 Round File

One edge of the file has no teeth. This is called the Safe Edge

Remember never use a file without a handle

Files

When filing soft metals like aluminium the file may get clogged up. This is called Pinning. Use a File Card to keep the file clean

File Card

When using Acrylic paint remember to clean your brush in warm water as soon as you have finished painting

Acrylic Paint

We used Counter Sink Screws to fix the coat hook to the wall

Countersunk Woodscrews

Countersunk Woodscrews

The End