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cone Calculator

Posted: Sat Feb 02, 2008 8:14 pm
by zelph
This cone calculator might be of help to some that are tinkering with making a cone shaped windscreen/potholder.

By plugging in dimensions to suite your pot and burner height you can get an idea of how large a piece of material would be needed to make your choice of cone. And also the radius to swing the arc. A set of trammel points would be used to swing large arcs or even a string with nail attached at one end and a pencil at the other.

http://www.kolumbus.fi/antti.lusila/mod ... artio.html


Trammel Points for wood working: http://www.toolsforworkingwood.com/inde ... d=ST-TP.XX

Re: cone Calculator

Posted: Sat Feb 02, 2008 8:53 pm
by oops56
zelph wrote:This cone calculator might be of help to some that are tinkering with making a cone shaped windscreen/potholder.

By plugging in dimensions to suite your pot and burner height you can get an idea of how large a piece of material would be needed to make your choice of cone. And also the radius to swing the arc. A set of trammel points would be used to swing large arcs or even a string with nail attached at one end and a pencil at the other.

http://www.kolumbus.fi/antti.lusila/mod ... artio.html


Trammel Points for wood working: http://www.toolsforworkingwood.com/inde ... d=ST-TP.XX
Dam the light just came on make a cone to fit your pot and use sterno heat i beat it be better with sterno now where is my string forget it use 55 gallon drum for circle

Re: cone Calculator

Posted: Sun Feb 03, 2008 11:46 pm
by CajunHiker
http://zenstoves.net/PotStands.htm
Scroll down about halfway down the page.

Re: cone Calculator

Posted: Mon Feb 04, 2008 11:42 am
by zelph
CajunHiker wrote:http://zenstoves.net/PotStands.htm
Scroll down about halfway down the page.
Thanks for tip CajunHiker, the calculator worked great. I pulled a little of the information down to show it up close here. An explanation is given in the 1st photo. I like the last line where a FIDDLE Factor is given :D

ImageImageImage

Re: cone Calculator

Posted: Mon Feb 04, 2008 12:23 pm
by oops56
zelph wrote:
CajunHiker wrote:http://zenstoves.net/PotStands.htm
Scroll down about halfway down the page.
Thanks for tip CajunHiker, the calculator worked great. I pulled a little of the information down to show it up close here. An explanation is given in the 1st photo. I like the last line where a FIDDLE Factor is given :D

ImageImageImage
Its all greek to me

Re: cone Calculator

Posted: Mon Feb 04, 2008 5:39 pm
by zelph
oops56 wrote:
zelph wrote:
CajunHiker wrote:http://zenstoves.net/PotStands.htm
Scroll down about halfway down the page.
]
Its all greek to me
You said you were going to use a garbage can to make a cone, how did it turn out? :D

Re: cone Calculator

Posted: Sun Feb 17, 2008 10:43 am
by DarenN
hi all;
cone layout is something i've done a lot of in my trade. (sheet metal worker). if anyone is interested in a simplified method, i'll put together a little pictorial instruction. post a reply here and i'll get to work on it.
DarenN......

Re: cone Calculator

Posted: Sun Feb 17, 2008 11:01 am
by oops56
DarenN wrote:hi all;
cone layout is something i've done a lot of in my trade. (sheet metal worker). if anyone is interested in a simplified method, i'll put together a little pictorial instruction. post a reply here and i'll get to work on it.
DarenN......
I did it but not to good like to know how you do it thanks

Re: cone Calculator

Posted: Sun Feb 17, 2008 11:23 am
by DarenN
i'll get to work on it!

Re:a crash course in pattern development

Posted: Sun Feb 17, 2008 1:21 pm
by DarenN
here we go!
first we settle on the dimensions.
Image
this one is based on a trangia burner and a heiny pot. 7" tall. pot under the top rib, 3 3/8". 2" taper in the cone, 5 3/8".

the vertical height is measured on a baseline, and the RADII (radiuses) measured out square from the baseline.
Image

with a straightedge connect the radii and continue on across the baseline. we call this point the "APEX".
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useing the apex point and the short radius scribe an arc.
Image

same for the long radius.
Image

diameter times PI=circumference. for the short radius (top) this comes to 10 9/16". set dividers to 1" and, starting at the baseline, step off ten inches along the arc, then add 9/16".
Image

the long radius gives a circunference of 16 7/8". step off 16" along the arc and add 7/8".
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use the straightedge to connect these two points. note that this line connects to the apex point.
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arrows indicate the corners of our pattern. add tabs or what ever you want to use to hold it together.
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useing this method i can make a ductwork pipe reducer in about 15 minutes. sadly, pattern development is becoming a thing of the past. with the introduction of CNC shape-cutters any monkey with a tinners hammer can make complicated fittings that used to take hours of benchwork to lay out. i'm glad i learned this stuff 25-30 years ago. they don't even teach some of it in the trade schools now'days. shame.

i hope this is somewhat helpful to someone. i enjoyed doing it.

DarenN..........