so i have tasks to do in our cad or autocad subjec...

Nice, Fusion 360 time 😎

I’ll walk you through how to make 3D objects in Autodesk Fusion (Fusion 360) in a way you can literally follow for your CAD/AutoCAD class.

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1. Basic setup (do this first)

1. Open Fusion 360
2. Go to Design workspace (top-left, usually default).
3. Check units:
   • Document Settings (left browser, top) → click the units (e.g. mm) → Change Active Units if needed.
4. Learn the view controls:
   • Orbit: hold middle mouse + right mouse, or press Shift + middle mouse
   • Pan: hold middle mouse
   • Zoom: scroll wheel

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2. General workflow for ANY 3D object

Almost all solid models follow this pattern:

1. Create a sketch
   • Toolbar: Create Sketch
   • Pick a plane: XY (top), XZ (front), or YZ (side).
2. Draw 2D shapes
   • Use Line, Rectangle, Circle, Arc, Polygon tools.
3. Add dimensions & constraints
   • Use Dimension (D) tool to give exact sizes.
   • Constraints (horizontal, vertical, equal, etc.) keep geometry neat.
4. Finish sketch
   • Click Finish Sketch (top right of sketch panel).
5. Turn sketch into 3D
   • Extrude (E): push/pull a profile into 3D.
   • Revolve: spin a profile around an axis.
6. Modify the solid
   • Fillet: round edges.
   • Chamfer: bevel edges.
   • Shell: hollow out.
   • Hole: proper drilled holes.
   • Pattern: create repeated features.
7. Save
   • File → Save and give a proper filename (e.g. 3D_Object_YourName).

Now let’s build 3 sample objects you can use as your assignment (or at least as practice):

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3. Object 1 – Simple box with 4 holes (like a plate / base)

Step-by-step

1. Create Sketch
   • Click Create Sketch → choose Top (XY) plane.
2. Draw a rectangle
   • Choose 2-Point Rectangle.
   • Click the origin → drag out → click.
   • Add dimensions (press D):
     • Length: e.g. 100 mm
     • Width: e.g. 60 mm
3. Draw 4 circles for holes
   • Use Circle → Center Diameter Circle.
   • Place one circle near each corner (don’t worry about exact position yet).
   • Use Dimension (D) to:
     • Set the hole diameter (e.g. 10 mm).
     • Set distance from each hole to the nearest edges (e.g. 10 mm from each side).
4. Finish Sketch
   • Click Finish Sketch.
5. Extrude the plate
   • Select the rectangle profile (not the circles).
   • Click Create → Extrude or press E.
   • Set distance to 10 mm (for example) → OK.
6. Cut the holes
   • Select the 4 circles (they’re now on the top face).
   • Again Extrude (E).
   • Under Operation, choose Cut, and set distance to go through all (or a bit more than 10 mm) → OK.
7. (Optional) Fillet corners
   • Modify → Fillet.
   • Select the 4 outer vertical edges.
   • Give them, say, 5 mm radius → OK.

Boom, that’s a clean 3D base with 4 holes 👍

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4. Object 2 – A cylinder with a chamfer (like a simple knob)

1. Create Sketch
   • Create Sketch → choose Top plane.
2. Draw a circle
   • Center Diameter Circle.
   • Click origin → set diameter, e.g. 50 mm.
3. Finish Sketch.
4. Extrude
   • Select the circle → Extrude (E) → distance 30 mm → OK.
5. Add chamfer
   • Modify → Chamfer.
   • Select the top outer edge of the cylinder.
   • Type a value, e.g. 3 mm → OK.
6. (Optional) Add a hole through the center:
   • Create → Hole.
   • For placement, click the top face center (Fusion usually snaps to the center).
   • Set diameter (e.g. 10 mm) and depth (e.g. 30 mm or Through All) → OK.

Now you have a cylindrical knob-like part.

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5. Object 3 – L-shaped bracket

Good practice for sketching and multiple faces.

1. Create Sketch
   • Create Sketch → Front plane (XZ).
2. Draw an L shape
   • Use Line tool to draw a simple L:
     • Horizontal line (e.g. 80 mm).
     • Vertical line up at one end (e.g. 60 mm).
     • A line back toward the original side (e.g. 20–30 mm).
     • Close the shape to make a full L profile (like a thick corner).
   • Use Dimension (D) to give exact thicknesses, like:
     • Leg thickness: 10 mm
     • Other dimensions: as required.
3. Finish Sketch.
4. Extrude
   • Select the L-shape profile.
   • Extrude it back by 20 mm → OK.
5. (Optional) Add holes
   • On one face, Create Sketch.
   • Add a circle in the middle → dimension it → Finish Sketch.
   • Extrude (Cut) to make a bolt hole.
   • Repeat for the other leg if needed.
6. (Optional) Fillet edges
   • Modify → Fillet → soften sharp corners.

This makes a nice “mechanical” part that looks like real hardware.

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6. How you can present this for your subject

For your CAD/AutoCAD class, you can:

• Create 3 separate Fusion files (one for each object)
  or
• Put them in one design but keep them separated in space.

To make it look professional:

• Use Inspect → Measure to show your dimensions when needed.
• Use File → Export to get .STL or .STEP if your teacher wants.
• Screenshot:
  • Use a nice angle (orbit the view).
  • Turn on Visual Style → Shaded with edges (top display settings icon).

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If you tell me what exact shapes your teacher asked for (like “a key, a gear, a mug,” etc.), I can give you very specific step-by-step instructions for those exact objects too.

Nice, this is a classic little flange 👍
You can absolutely do it without mirror: just circles + constraints + trim, then extrude.

I’ll assume you’re using Fusion 360.

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1. Make the 2D sketch

1. New sketch

   • Create Sketch → pick the Top plane.
   • Turn on the Origin if it’s hidden (lightbulb in the browser).

2. Center circles (Ø26 and Ø40)

   • Create → Center Diameter Circle.
   • Click the origin:
     • Type 26 → OK (inner hole).
     • Again on the origin, type 40 → OK (outer ring).

3. Construction circles for layout (Ø52 and Ø70)
   These just help with positions, you won’t keep them in the final part.

   • Same circle tool, center at origin:
     • Draw Ø52.
     • Draw Ø70.
   • Select these two circles → in the Sketch Palette tick Construction.

4. Right bolt boss (Ø30 with Ø12 hole)

   • Still in the sketch, draw a rough circle to the right of the center.
   • With that circle’s center point selected:
     • Apply Coincident constraint to the Ø52 construction circle (center lies on that circle).
     • Apply Horizontal/Vertical between the origin and this center → they line up horizontally.
   • Dimension this circle to Ø30.
   • At the same center, draw another circle and set it to Ø12 (the hole).

5. Left bolt boss (no mirror, just repeat)

   • Draw another circle roughly to the left.
   • Make its center:
     • Coincident with the Ø52 construction circle.
     • Horizontally aligned with the origin (Horizontal/Vertical with origin again).
   • Dimension this outer circle to Ø30.
   • Draw the inner hole at the same center, Ø12 again.

   (If you want perfect equality: select the right Ø30 circle and the left Ø30 circle → use Equal constraint.)

6. Create the outer outline from the circles

   Now you have:

   • Big construction circle Ø70,
   • Two Ø30 bosses,
   • Rings Ø26 / Ø40 in the middle.

   Use Trim (T):

   • Trim away the parts of the Ø70 circle that are inside the Ø30 bosses.
   • Trim away the parts of the Ø30 circles that are inside the Ø70 region, leaving only their outside arcs.
   • If Ø52 circle is visible as a line, either delete it or keep it as construction.

   You should end up with:

   • A smooth “rounded diamond” outside shape,
   • The ring between Ø40 and the outer outline (solid),
   • The inner hole Ø26 (empty),
   • Two small bolt holes Ø12 with their Ø30 bosses.

7. Finish sketch

   • Click Finish Sketch.

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2. Turn it into 3D

1. Main body extrude

   • Click in the area between the outer outline and the Ø40 circle (don’t select the Ø26 or Ø12 holes).
   • Press E (Extrude).
   • Set the thickness your drawing says (e.g. 10 mm, 15 mm, etc.).
   • Operation: New Body → OK.

2. Cut the central hole

   • On the top face you’ll still see the Ø26 circle profile.
   • Select that profile → Extrude (E).
   • Direction: Through All, Operation: Cut → OK.

3. Cut the two bolt holes

   • Select both Ø12 profiles.
   • Extrude (Cut) → Through All → OK.

Now you’ve got the 3D flange from that 2D drawing, and you never used mirror 😄

If you send the full dimension sheet (including thickness and center-to-center distance, if it’s shown) I can match your teacher’s numbers exactly and tweak the steps to that.

Ahh gotcha, so the bolt centers are on a Ø58 circle. Easy fix — we just add that as a construction circle and snap the bolt centers to it.

I’ll rewrite the 2D steps using Ø58 (and still no mirror 👌).

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1. Base sketch (center stuff)

1. Create Sketch → Top plane.

2. At the origin, draw these circles:

   • Ø26 → inner hole
   • Ø40 → inner “solid” ring
   • Ø70 → big outer circle (for the long direction)

3. Turn on construction if needed later, but for now leave them normal.

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2. Bolt-center circle Ø58 (construction)

1. Still in the same sketch:
   • Draw another circle from the origin, diameter Ø58.
2. Select this Ø58 circle → in Sketch Palette, tick Construction.
   This is now your “path” where the bolt centers lie.

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3. Right bolt boss (no mirror)

1. Draw a rough circle to the right of the origin (this will be the Ø30 boss).
2. Select its center point:
   • Apply Coincident constraint to the Ø58 construction circle → the center lies on the circle.
   • Apply Horizontal/Vertical between that center and the origin → it moves to the right side exactly.
3. Dimension this outer circle to Ø30.
4. At the same center, draw another circle and dimension it Ø12 (the hole).

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4. Left bolt boss (again, no mirror)

1. Draw another rough circle to the left.
2. Make its center:
   • Coincident with the Ø58 construction circle.
   • Horizontal/Vertical with the origin again → it snaps to the left side.
3. Give it diameter Ø30.
4. At the same center, draw the Ø12 hole.
5. (Nice trick) Select the two outer Ø30 circles → apply Equal so both bosses stay identical.

At this point you have:

• Big center circles: Ø26, Ø40, Ø70
• Construction circle: Ø58
• Two bosses: Ø30 with Ø12 holes, centers on Ø58.

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5. Make the outer “rounded diamond” outline

1. Use Trim (T):
   • Trim pieces of the Ø70 circle where it runs inside the Ø30 bosses.
   • Trim pieces of the Ø30 circles that overlap the Ø70 circle, so the outer boundary becomes a smooth shape made from:
     • Two arcs from the Ø70 circle,
     • Two arcs from the Ø30 circles.
2. If any extra lines from Ø58 are still visible as normal geometry, make them construction or trim/delete them.

You should now have:

• One closed outer profile,
• The Ø40 circle,
• The Ø26 circle,
• Two Ø12 circles.

Finish Sketch here.

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6. Make it 3D (quick recap)

1. Extrude main body

   • Select the area between the outer outline and Ø26/Ø12 holes (but not the holes themselves).
   • E → set the thickness (from your drawing) → New Body.

2. Cut center hole

   • Select Ø26 profile → E → Cut, Through All.

3. Cut bolt holes

   • Select both Ø12 profiles → E → Cut, Through All.

Done: you’ve respected the “bolt centers on Ø58” requirement and never used mirror 🎯

If you tell me the thickness value on your sheet, I can tell you exactly what to type into the Extrude box too.

Good question – that one confuses a lot of people at first 🙂

What Ø30 actually means

• Ø12 = the bolt hole size (the hole the bolt passes through).
• Ø30 = the outside diameter of the round “pad” / boss around that hole.

So around each bolt you don’t just have a tiny Ø12 hole floating there – there is a thicker circular area of material, 30 mm wide, that blends into the main flange.

Think of it like:

• inner circle: Ø12
• outer circle (material around hole): Ø30

The drawing only shows part of that Ø30 circle, because the rest of it blends into the big outer shape.

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How to use Ø30 in your Fusion sketch

For each bolt:

1. Place the bolt center

   • Use your Ø58 construction circle like we talked about (center on that circle + horizontal/vertical with the origin).

2. Draw two circles at that center:

   • Circle 1: Ø12 → this is the hole.
   • Circle 2: Ø30 → this is the outer pad.

3. Use Trim later:

   • When you build the outer flange shape (with the Ø70 etc.), you’ll trim away the parts of the Ø30 circle you don’t need.
   • The remaining arc of the Ø30 circle becomes the rounded end of the flange near the bolt.

Then when you Extrude the whole profile:

• The region between the outer outline (which includes those Ø30 arcs) and the inner holes gets extruded as one solid body.
• The Ø12 circles are used as cut extrudes (Through All) to make the bolt holes.

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Mental shortcut

• If your teacher ever showed this as fillets instead, Ø30 is the same as saying fillet radius R15 around the bolt hole.
• But in this drawing they chose to dimension it as a full diameter Ø30 circle.

If you want, send a screenshot of your sketch and I can tell you exactly what to trim/keep so the Ø30 is being used correctly.