Year 10 Manufacturing (Resistant Materials)

Lesson 10 Week 10 Vacuum Forming (Clock Project)

Programmes of Study Teachers Rational Lesson1 (Situation and Brief) Practical Skills Design Skills Theory and Knowledge
Lesson 2
Orthographic Drawings
Brainstorming, Cognitive Charts
and Attribute Analysis
Lesson 4
Plastics. Properties, Uses and Common Forms.
Hardwoods and Softwoods Properties, Uses and Common Forms
Ferrous and Non-Ferrous Metals, Properties and Common forms
Drawing Styles and Modelling

Lesson 9
Vacuum Forming
Lesson 11
Lesson 12

Stages of Vacuum Forming

Vacuum Former

Stages of Vacuum Forming

1. Clamp the plastic sheet to the top of the box using the toggle clamps. Heat the plastic until it turns to a malleable state. The material will first start to sag under its own weight. It will then sit completely flat. It may be tested with a stick. It will feel rubbery.

2. Suck the air out of the vacuum former by switching on the pump. The plastic (polystyrene) will press down over the mould as can be seen on the diagram. If your machine has a moveable plattern it is a good idea to raise it upwards into the hot sheet before the air is sucked out.

3. As can be seen from this diagram the plattern and mould has been raised into the hot plastic before the vacuum pump has been turned on.

4. In this diagram the air has been sucked from underneath the plattern and atmospheric pressure has pressed down onto the plastic creating the sharp definition.

5. The sheet is unclamped from the frame and the mouldd is removed. Excess material around the moulding is trimmed off.