Lesson 1: Your Keyring Base (Millimetres Matter!)

📚 Quizizz Lesson: Starting Inventor – Lesson 1: Your Keyring Base (Millimetres Matter!)

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We’ll design your own custom keyring in Autodesk Inventor. But first — we MUST get the units right!

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​Welcome to Inventor – Let’s Make a Keyring!

Inventor is a CAD tool that lets us make 3D models from 2D sketches. But remember: it's American — it's standard unit is feet and inches!

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What is Autodesk Inventor?

Inches will make your model the WRONG size. Always choose millimetres when starting a new file.

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We Use MILLIMETRES in Australia!

Multiple Choice

What unit does Inventor use by default?

• Feet

• Inches

• Centimetres

• Millimetres

Multiple Select

What happens if you forget to use millimetres?

• Huge model

• Tiny Model

• Confusing Model

Click New > Part, then choose the millimetres template. This is essential for all Australian designers.

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Starting Your Part File

Sketching is how we start every part. Click Start 2D Sketch, then click the XY Plane.

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Step 2 – Start a 2D Sketch

Use the Rectangle Tool to draw a shape around 60mm × 30mm. Use millimetres!

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​Step 3 – Sketch Your Keyring Shape

Multiple Choice

How big should your rectangle be?

• 60 x 30mm

• 75x25mm

• 6 inches by 3 inches

• 60 cm by 30cm

Add a 5–8 mm circle near the corner of the base — this is where the ring goes.

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Step 4 – Hole for the Keyring

Click Extrude, then type 5 mm for the thickness. Double-check that you are NOT in inches!

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Step 5 – Make It 3D

Multiple Choice

What’s the correct extrusion height?

• 5mm

• 4mm

• 6mm

• 7mm

File > Save As → Name your part like this: firstname_keyring_base.ipt

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​Step 6 – Save Your File

Take a screenshot of your model using Windows + Shift + S, save it, and upload it to SEQTA

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Final Step – Screenshot & Upload