302 2.2 scales for drawings

Poll

Have you used drawing scales before?

• Yes

• No

• Not sure

Multiple Choice

A drawing scale of 1:10 means that 1 unit on the drawing represents how many units on the actual object?

• 10 units

• 1 unit

• 100 units

• 0.1 units

Open Ended

Why is it important to use accurate drawing scales in boatbuilding?

Multiple Choice

Which of the following is NOT a reason why scales are important in boatbuilding?

• Clear communication between stakeholders

• Ensuring precision and accuracy in measurements

• Improving boat speed during sailing

• Material planning and cost control

Match

Match the common scales

• full-size plans

• detailed parts

• Interior arrangements

• Hull shapes

• large overview plans

1:1

1:2

1:10

1:20

1:50

• 1:1

• 1:2

• 1:10

• 1:20

• 1:50

Multiple Choice

Which scale is most suitable for a full-size jig?

• 1:10

• 1:1

• 1:100

• 1:5

Fill in the Blanks

For a 1:10 drawing, 6mm on the drawing represents

mm in real size.

Fill in the Blanks

For a 1:2 drawing, 10mm on the drawing represents

mm in real size.

Multiple Select

Why are scaled drawings used in boatbuilding?

• To decorate workshop walls

• To make the boat look smaller

• To fit large objects onto paper

• To avoid having to measure

Draw a scale drawing of the classroom on graph paper

Measure the length and width of the room and decide on an appropriate scale for the graph paper. Which scale will you use? 1:1 1:10 1:20 1:25 1:50 or 1:100 Try to pick the scale that will let you draw the largest for the paper. You may be able to use 1:1000 scale but would it be practical? Once you have decided on the scale then add the desks, doors and windows.

Open Ended

Explain why it is important to double-check your calculations before cutting expensive materials in boatbuilding.

Multiple Choice

Which of the following is a common mistake to avoid when working with scaled drawings in boatbuilding?

• Always verify the scale on each drawing

• Mixing metric and imperial measurement systems

• Double-checking critical dimensions

• Allowing for material thickness

Multiple Choice

Why is it dangerous to print a scale drawing without checking print size settings?

• It could distort the scale.

• Scale becomes 1:1

• Printer might use too much ink

• It guarantees the paper will not jam during printing.

Math Response

1. In a 1:20 scale drawing, what does 70mm represent in real life?

Type answer here

Correct Answer: 1400

Deg^°

Rad

Fill in the Blanks

Which scale would be most appropriate for creating a full-size rudder template?

Math Response

If the actual beam of a boat is 2 metres, what would it measure in millimetres on a 1:20 drawing?

Type answer here

Correct Answer: 100

Deg^°

Rad

Multiple Choice

Why is it important to check printed drawings against a known dimension?

• To verify the scale hasn't been distorted

• Checking dimensions is irrelevant in small projects.

• It is only necessary for digital designs.
• To make the drawings look more professional and pretend you know what you're doing.

Multiple Choice

What scale would typically be used for showing the overall profile of a 15m yacht on A3 size paper? A3 is 420mm x 297mm

• 1:1

• 1:10

• 50:1

• 1:50

• 1:100

Open Ended

Why is it important to check printed drawings against a known dimension?