Creating an angled curve, like a partial cone
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Creating an angled curve, like a partial cone
Let's see if I can ask this and make sense...
Say I have the diameter of a circle. I want to place a larger circle under it, then fill in the sides with sheet styrene.
How do I calculate the curve I need for the flat sheet that will become the cone so when I cut out that shape from the flat sheet I can then just wrap it around without overhang?
For example, would I create something like the cone for the millennium falcon cockpit, but much larger diameter and much shorter
edit
i.e. something like this
http://www.korthalsaltes.com/gif1/truncated-cone.gif
Say my top circle is 10" diameter, the bottom one is 12" diameter and I want a 1.5" space between them. How would I figure out the curved side piece inner and outer radii
It will be too large to cut from one sheet and I would like to make individual sections maybe done in 8ths
Say I have the diameter of a circle. I want to place a larger circle under it, then fill in the sides with sheet styrene.
How do I calculate the curve I need for the flat sheet that will become the cone so when I cut out that shape from the flat sheet I can then just wrap it around without overhang?
For example, would I create something like the cone for the millennium falcon cockpit, but much larger diameter and much shorter
edit
i.e. something like this
http://www.korthalsaltes.com/gif1/truncated-cone.gif
Say my top circle is 10" diameter, the bottom one is 12" diameter and I want a 1.5" space between them. How would I figure out the curved side piece inner and outer radii
It will be too large to cut from one sheet and I would like to make individual sections maybe done in 8ths
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OK, this it where it get's a little complicated.
http://gekgasifier.pbworks.com/f/HowToM ... e-1000.jpg
http://gekgasifier.pbworks.com/f/HowToM ... e-1000.jpg
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I know that's not what the instructions say, but the kit's wrong anyway.
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I used this building my Chiss fighter years ago: https://www.conelayout.com/
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Would the following help?Andrew Gorman wrote:Find a model rocket "shroud calculator" and you are in business.
http://rocketry.newcenturycomputers.net/shroudcalc.html
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Thanks everyone, they were are all helpful but I thnk the rocketry one looks to be the easiest with the ability to generate the template
Although I did happen to come across this http://jm.davalan.org/calc/cone/index-en.html
which gave me different value than what I got here for the same inputs
http://rocketry.newcenturycomputers.net/shroudcalc.html
Although I did happen to come across this http://jm.davalan.org/calc/cone/index-en.html
which gave me different value than what I got here for the same inputs
http://rocketry.newcenturycomputers.net/shroudcalc.html
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Mind you that the two ask for different inputs. Shroudcalc asks for the diameters while the other asks for the radii.blakeh1 wrote:Thanks everyone, they were are all helpful but I thnk the rocketry one looks to be the easiest with the ability to generate the template
Although I did happen to come across this http://jm.davalan.org/calc/cone/index-en.html
which gave me different value than what I got here for the same inputs
http://rocketry.newcenturycomputers.net/shroudcalc.html
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Not surprising, since model rocket body tubes are described by their diameters.Chacal wrote:Mind you that the two ask for different inputs. Shroudcalc asks for the diameters while the other asks for the radii.
I'm the guy who wrote the Shroud Calculator, and let me say that I'm happy to see it be of use to someone besides myself!
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Yes, thanks! I used it for the cone behind the ball cockpit on my Chiss fighter: Unfinished: http://i.imgur.com/ApUIX7P.jpg
Finished: http://i.imgur.com/mLCL0KC.jpg
Finished: http://i.imgur.com/mLCL0KC.jpg
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I'm trying to make a similar piece, but from a non-regular cone though. I want to create the part circled in red:
http://m.imgur.com/fXvuqSm
It's the same kind of truncated cone shape, but the cone it's based on is tapered more sharply on one side, and the base is an egg shape instead of a circle. Here is the part I have so far:
http://m.imgur.com/DSMiKmj
http://m.imgur.com/6ukKusf
http://m.imgur.com/fXvuqSm
It's the same kind of truncated cone shape, but the cone it's based on is tapered more sharply on one side, and the base is an egg shape instead of a circle. Here is the part I have so far:
http://m.imgur.com/DSMiKmj
http://m.imgur.com/6ukKusf
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I was trying a while back to find a formula for making a truncated cone — I wanted to make the engine cans for an X-wing fighter. Never have quite gotten to it for various reasons. However, I did learn that the word for a truncated cone shape is frustum. Just FYI.
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Could the article "How to Design and Build Oblique Nose Cones" be of help?CarlGo wrote:It's the same kind of truncated cone shape, but the cone it's based on is tapered more sharply on one side, and the base is an egg shape instead of a circle.
https://www.apogeerockets.com/education ... ter127.pdf
For a more general approach, look for a textbook on drafting then look up section titled something like "Developments and Patterns." Online you can try Google with combination of keywords such as "drafting development and patterns". Please note you're likely to find links that don't seem to apply (as they are about clothing), but I'd recommend that you *not* ignore those -- you may still glean some useful information from them. Think about it for a moment -- often clothing is often made up of parts cut from a flat sheet and stitched together to form relatively complex shapes. Similarly look at shoes and hats -- and ponder for a moment how those shapes are constructed (in particular how various molding techniques can be used to form rounded shape from what began as a flat sheet).
Speaking of application of techniques that doesn't seem to be related to your model-building hobby -- crochet techniques can be useful in rocketry:
https://www.youtube.com/watch?v=ETiB_V-_SGs
Naoto Kimura
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