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Old May 26, 2004, 10:38 PM
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3D modeling - Spitfire Mk.IX in AutoCAD

Lesson 1 - 2D plan into a 3D plane


This is my method using AutoCAD 2002. The example file is spitmk9.dxf which is available for free as plan #56 as spitmk9.zip and is 574k

http://plans.am.free.fr/

The building thread for this Electric RC Spitfire Mk.IX is here

http://www.rcgroups.com/forums/showthread.php?t=130235

The plan features retracts and options for an AXI brushless or Speed 600.
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Last edited by PLANE FREAK; May 30, 2004 at 03:53 PM. Reason: Link fixed
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Old May 26, 2004, 10:40 PM
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Lesson 1 - 2D plan into a 3D plane

Choose a Former and copy it to a clear area of the drawing. Remove any extra parts that got copied as the pieces are close together in some areas. Create a new layer to trace the parts onto. I use the white line color since it shows up nice over the dark blue plans.

You are going to extrude the part but not all types of lines can be extruded. The lines are made from differnet segments which will not make a 3D object. The outside must be a polygon or polyline.

Also place a single point in the center of the former (indicating the center of the airplane). Look at the plans and you will see a reference line running down the center of the plane on the side and top view. We will use this line later and need to be able to find it.

Determine where this point is on each former. Most of them have intersecting lines drawn on them. Do not place any text in or near the Former as you need to be able to select it with a box.
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Old May 26, 2004, 10:42 PM
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Lesson 1 - 2D plan into a 3D plane

Use the POLYLINE function with the snap turned on [F3] and trace the outside of the former. If you find a spot where the next corner will not snap to press [F3] once to toggle the snap off and place the corner by hand. Go all the way around and close the polyline. You can select the polyline after it is drawn and type [C] to close if it did not close automatically.

Remember to save the file often and use a new name !
It takes hours to do all that work so don't let a power failure catch you !

filename_1aa.dwg
filename_1ab.dwg
filename_1ac.dwg and so on
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Old May 26, 2004, 10:45 PM
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Lesson 2 - 2D plan into a 3D plane

Trace the inside if it is complex. For simple rectangles and circles use the Solids toolbar and make boxes and cylinders for those pieces. The former is 3mm ply so extrude the center pieces to 5mm. Extrude all center shapes to 5mm and then extrude the outside polyline to 3mm (or what ever the correct thickness is)
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Old May 26, 2004, 10:47 PM
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Lesson 2 - 2D plan into a 3D plane

Hold [ALT] and type [V][S][G] This will shade the 3D objects. If the part you just extruded is filled in solid then it worked.

Hold [ALT] and type [V][B] for the 3D Orbit view.
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Old May 26, 2004, 10:50 PM
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Lesson 2 - 2D plan into a 3D plane

Inner extruded 5mm and Outer extruded 3mm.
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Old May 26, 2004, 11:07 PM
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Lesson 2 - 2D plan into a 3D plane

To get back to normal

Hold [ALT] and type [V][3][T] for the top viewport.

Hold [ALT] and type [V][S][2} for the 2D wire frame view.

At this point I changed the color to Cyan.

Now that you have a Former with pieces sticking out of it we are going to remove them to make holes. Use the Solids Editing toolbar and choose subtract. Click on the outside line to select what you want to keep and press [ENTER]. Click on the edge of the line to select each piece you want to remove and press [ENTER] to finish.
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Old May 26, 2004, 11:10 PM
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Lesson 2 - 2D plan into a 3D plane

The completed piece in 3D Orbit view.
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Old May 26, 2004, 11:12 PM
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Lesson 2 - 2D plan into a 3D plane

The former has been created in 3D. Now turn off all the other layers so only the piece you made is visible. Select the entire Former with a bounding box. Right click and choose Copy with Base point. Use the snap set to node to find the point you placed at the center.

Paste the former into a new drawing at 0,0,0 (the origin).

Save this drawing as F1a.dwg (you don't really need this file so you can delete it later).

Change to the Right view port and rotate the former around 0,0,0 to 90 degrees. Enter the numbers in the console to get them exact. Rename the this layer to "1 Fuselage" (not layer 0) the one under it.

Save this drawing as F1a_right.dwg
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Old May 26, 2004, 11:18 PM
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Lesson 3 - 2D plan into 3D plane

Prepare a drawing with the side view and top view intersecting each other and the origin set to the front of the firewall at the exact center of the plane. Do not set the origin to the tip of the spinner. Select the Right viewport.

This will be the 3D drawing.
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Old May 26, 2004, 11:20 PM
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Lesson 3 - 2D plan into 3D plane

Open F1a_right.dwg and Copy with Base point to 0,0,0.

In the 3D drawing Right click and choose Paste but to not Left click. Type in 3,0,0 [ENTER] in the console.

Save the drawing as spitmk9_3D_build_1aa.dwg
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Old May 26, 2004, 11:23 PM
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Lesson 3 - 2D plan into 3D plane

Use the Shading and 3D Orbit to inspect you work.
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Old May 26, 2004, 11:26 PM
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3D modeling - Spitfire Mk.IX in AutoCAD

The 3D model is built piece by piece just like a kit.
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Old May 26, 2004, 11:27 PM
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3D modeling - Spitfire Mk.IX in AutoCAD

This is a good way to find errors or see how changes will look.
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Old May 27, 2004, 08:42 AM
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This is EXACTLY what I've been looking for. Hated to request it due to the work involved

Will be following w/ great interest.

THANKS
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