#1
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Making eliptical funnels
Hi guys
Another question for you. i need to make an eliptical funnel for my model, not sure of the exact methode ti do it. The funnel is eliptical but also tapers toward the top. |
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#2
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Do you have a sketch to see how it's gonna supposed to be?
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#3
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This is how I create parts...with my minds eye and some math!
In general I don't use 3D software (CAD, Sketchup, etc) to design my models. I create almost everything already unfolded in 2D with Coreldraw. So it means creating basic drawing patterns and using a lot of math. I do a good job of imagining the part and how it will assemble... but theres usually some trial and error with test fitting parts. Calculating an elliptical tube with offset ends is fairly straightforward but you need to establish some basic things first...
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#5
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I’m assuming that you you are given the expanded shape of the funnel in the kit, if it is a kit. I’ve just made the funnel for HMV’s SMS Beowulf, which is a true cylinder, not tapered. I’ve also made the gun barrels which are tapered.
In both cases I used a drill bit, about half the diameter of the object to roll the cardboard (actually for the guns I used typing paper because they are quite small) on an old mouse pad. The card quickly takes up the curvature but you need to use a bit more pressure on the mating edges as the edges don’t take the curve so readily. You can add the taper by just rolling the drill bit in an arc. Glue a joining strip, pre rolled as well, on one edge of the funnel, then finish by glueing it shut. Hope this helps! |
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#6
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Make the holes (top and bottom), roll some scrap paper together and put it through it in a way that it touches the holes, mark the perimeter of the holes with a pen, pull the paper out, cut it open / flatten it and you have the shape.
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#7
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Thanks guys, some great ideas there.
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