14
4.7.
Making a production estimate
Production estimates calculate the cost of a project before it begins. This way, we
can decide if our project is profitable as we have designed it, or if it would be better
to choose other materials or models to bring costs down.
We make a note of the materials we are going to use. We calculate the quantity
we need, keeping in mind the breakdowns and the Progress Status Sheet. Then,
we multiply the result by the unit price to get our budget.
No.
Quantity
Material
Unit price Total price
1 x 2
Pieces of chipboard
40 cm x 40 cm
€1.20 unit
€2.40
2 ¼ tube Wood glue
€1.20 tube
€0.30
3 4 dm
2
Sheet of corrugated cardboard €0.60 dm
2
€0.24
4 150 cm Adhesive tape
€0.006 cm €0.15
5 x 12
Lollipop sticks
€0.03 unit
€0.36
To calculate this estimate for the materials you
must add labour costs, which is the total time
you think it will take to complete the project
multiplied by the amount we want to charge
per hour. Remember to include VAT.
Total w/o VAT
€3.45
VAT (21%)
€0.72
TOTAL
€4.17
The money we earn on the project will be the difference between the production
cost we’ve calculated and the retail price – the price we sell it for.
4.8.
Building and testing
Good design and planning will make
construction easier and quicker. In the
construction stage we should follow these
steps:
First, we will make the main structure of the
object. Then, we will add other smaller pieces
and details, following a logical order.
If you have to change the design of a piece
during construction, you should report this in
a
modifications map
.
It’s also a good idea to have a
building report
to keep track of what you do every day, what
problems came up, what solutions you found
and ways you could improve the work.
Understand
23.
Copy and complete the following sentence. A 60 cm x 80 cm sheet of
wood is _____ cm
2
, which is _____ dm
2
. If the price of the wood is €0.10
per cm
2
, what is the total price of the sheet?
Apply
24.
In your group, make a production estimate for your project.
25.
Build your project and calculate how much water our irrigation system
uses in one minute.
PLANNING YOUR TIME
Calculating time is very
important, not only in order to
have an idea of how long we
will take to complete theproject
butalsotocalculate labour costs.
Even for projects involving only
one person you have to plan all
the operations tomake the best
use of your time.
USE OF
MATERIALS
You can save material and
avoid unnecessary cuts if you
put pieces together that have
the same cut lines. Match
straight edges or corners to the
straight edges and corners of
the sheet of wood.
Remember to use tools and
adhesive correctly. Any extra
material can be used in the
future.
ADVANCE EDITION
