Power tools and abrasives

1. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Power tools and abrasives
sentation
Unit 215: Preparing surfaces for decoration

2. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Learning outcomes
• Know how to rectify surface conditions and defects.
• Know how to repair and make good surfaces.
• Know how to prepare trowelled finishes and plasterboard ready to
receive finishing systems.
• Know how to prepare timbers and timber sheet products ready to
receive finishing systems.

3. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Orbital
• Whole sanding plate moves in small circle
causing each grain of abrasive to move
likewise.
• Most common type of electric sander
available.
• Available with rectangular, square or round
base plates.
• When using an orbital sander, there is no
need to worry about the direction of wood
grain.
Types of sander

4. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Belt
• Generally removes material more quickly
than orbital sanders.
• Can make light work of sanding but
generally harder to achieve as good a
finish as with an orbital sander.
• Difficult to handle, can easily go against
the grain.
215.5
Types of sander

5. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Rotary
• The whole sanding disc goes round.
• The outer edge moves faster than the
centre, so the surface is subjected to
varying degrees of sanding.
Types of sander

6. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Palm
• Useful tool that fits into the palm of one
hand comfortably.
• Relatively light, easy to control and
cheap.
• The abrasive sheet is normally fixed to
the pad with velcro, which means it can
be replaced easily.
• They are quite small and have a
triangular shape to the pad, so they can
be used to sand into corners.
Types of sander

7. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Power tools
Task
1. Discuss in groups the safety implications when using power tools.
2. Discuss the advantages and disadvantages of using
various power tools.

8. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Abrasives
The term abrasive paper is used to cover a variety of grit on flexible
backing sheets, and it is used to smooth many types of material
including timber, metal, plaster etc.
Task
List the components that require abrading in the workshop.

9. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Abrasives
Glass paper
• Made from crushed glass bonded to a special backing paper.
• Best for sanding bare wood (including manmade boards) but can
also handle fillers of various sorts.
Aluminium oxide paper
• Made from bauxite and is bonded to a cloth backing, which performs
well on previously painted areas and bare surfaces.
• Tends to be sharper than glass or garnet paper.
• It does not clog.

10. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Abrasives
Silicone carbide paper
• Better known as wet and dry.
• When wet it is primarily used for rubbing down.
• Using water as the lubricant it cuts through and breaks down the
painted defective areas, such as sags and runs.
Emery paper
• Made from a natural mineral, carborundum, which is fused onto a
paper or cloth backing.
• Used with a degreaser as an abrasive for cleaning metals.
Task
Give examples of the degreasing agents available in the
construction industry.

11. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Abrasives
Garnet paper
• Made from less pure particles of garnet (the precious stone).
• It is harder than glass and is more suited for use on hardwoods.
• The grain clogs easily if used on softwoods.
Steel wool
• Used for the cleaning, preparing and
maintaining of wood and metal finishes.
Task
Discuss in groups grades available for use in the construction industry.

12. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Questions
1. Which power tool is best used for abrading large surfaces such as
floors?
2. List two safety considerations when working with power tools.
3. Which abrasive can be used wet or dry?
4. Which abrasive used with a degreaser can be used to clean metals?

13. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
Any questions?