Making a coned part

[Johnny]

MAKING A CONED PART



First I will say I'm no expert on the subject.The methodes I use may vary from others.But this is how I do things, and they work for me.

The coned parts are used a lot in cardmodels as parts of the front end on fuselages on planes,propeller cones,parts in tyres,and other coned objects.

First we cut out the piece and if there are a joining tab on it...cut it away and glue it on the back side of the part.In that case you wont have the edge showing.
http://www.papirmodeller.com/div/cone1sm.jpg (http://www.papirmodeller.com/div/cone1sm.jpg)

Nex I place the part inside my hand and have a rounded object ready.
The size of the rods I use vary.Smaller diameter on the rods gives tighter cones.
http://www.papirmodeller.com/div/cone2sm.jpg (http://www.papirmodeller.com/div/cone2sm.jpg)

Then I roll the rod against the part applying pressure to it.Remember to hold the angle against the edges of the part.And now we can see it curles up behind the rod
http://www.papirmodeller.com/div/cone3sm.jpg (http://www.papirmodeller.com/div/cone3sm.jpg)

Do this until the cone is so tight that it overlaps itselves a bit
http://www.papirmodeller.com/div/cone4sm.jpg (http://www.papirmodeller.com/div/cone4sm.jpg)

When you are happy with the shape glue it together
http://www.papirmodeller.com/div/cone5sm.jpg (http://www.papirmodeller.com/div/cone5sm.jpg)

[Zathros]

http://www.math.com/school/subject3/lessons/S3U4L4DP.html

The above link has some good formulas for figuring out comes mathematically.

[Leif Ohlsson]

Hey, Johnny, these are really good mini-tutorials. Just what newcomers (and some of us not-so-newcomers) need to hear and see; really helpful. They are short, sweet, to the point, and well illustrated. Keep going, and we'll all have a collection to be joined together in some form eventually.

Good work. Leif

[Rick Thomson]

For those of us who are lazy this is helpful...

http://i-logic.com/conecalc.htm

Rick

[whulsey]

Thanks for the info, much easier then digging out my old drafting book where we learned to laid out duct work. That was with T square, triangle and slide rule for you youngsters.

[dansls1]

Great link Rick! That'll be helpful to me (and would have been helpful during the beaufort build, I could have done my turret differently using this, but didn't want to go through all the algebra on my own - and didn't have time with the deadline ;) ).

[milenio3]

Thanks, Johnny!