Frustum of a cone

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skow69
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Frustum of a cone

Post by skow69 » Sun Sep 11, 2016 9:49 am

There have been several requests recently for a way to lay out a template for a cone. Here is the old school, low tech method. All you need is a measuring stick and compass. If it is not clear, please ask.
frustum.jpg
conicalfrustum.gif
conicalfrustum.gif (1.81 KiB) Viewed 6771 times
1) Draw the vertical origin line.
2) Draw r2 and r1.
3) Draw the diagonal to locate point F.
4) Draw the arcs extended from r2 and r1.
5) Calculate the circumference of the base c2. Divide by 20.
6) Set your compass to the distance c2/20.
7) Walk your compass 20 steps along the arc of r2. This will be the distance c2.
8) Draw a line from that point through F.
9) The purple area is your template.
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Kareltje
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Re: Frustum of a cone

Post by Kareltje » Sun Sep 11, 2016 3:29 pm

Nice! I like the clean, simple way to make an important and difficult to handle part!

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shadylane
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Re: Frustum of a cone

Post by shadylane » Sun Sep 11, 2016 4:51 pm

Thanks for posting the info :thumbup:
Since I'm almost mathematically illiterate :oops:
I've been using paper, tape and scissors to make Frustum templates :lol:

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der wo
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Re: Frustum of a cone

Post by der wo » Mon Sep 12, 2016 1:06 am

I once used this method to make a BIAB. It worked good. The method better than the bag...
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Re: Frustum of a cone

Post by Stinkehinke » Thu Sep 22, 2016 12:19 am

Love it. I learnt this in trade school and have used it many times. Circles are difficult, cones are more so. One of the best bits of maths that I know.

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Re: Frustum of a cone

Post by grousehunter » Sat Jan 21, 2017 8:12 am

Thanks skow69. Very useful.

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still_stirrin
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Re: Frustum of a cone

Post by still_stirrin » Sat Jan 21, 2017 11:05 am

Stinkehinke wrote:...Circles are difficult, cones are more so...
The "cone of frustration".
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skow69
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Re: Frustum of a cone

Post by skow69 » Sat Jan 21, 2017 12:42 pm

Finally! A use for that geometry crap they made you take in high school.
Distilling at 110f and 75 torr.
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Re: Frustum of a cone

Post by rad14701 » Sat Jan 21, 2017 5:17 pm

Nice write-up... I prefer the method Dan P. described in his Frustum/cone development for lyne arm etc. topic... Virtually no math required... That was the method I learned to make frustum patterns by years ago... Been using the method recently in preparation for making a dust separator... Software works great but if you don't have a plotter it's easier to do hand drawn layout instead of piecing standard printer paper sheets together, IMHO... Just wanted to offer up another option for those who haven't stumbled across this alternate method...

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Re: Frustum of a cone

Post by SpiritOf76 » Mon Sep 02, 2019 11:12 am

this website uses only imperial measurements, but it will create a template you can print and layout on your copper.

https://www.blocklayer.com/cone-patternseng.aspx
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corene1
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Re: Frustum of a cone

Post by corene1 » Mon Sep 02, 2019 8:00 pm

Easiest layout I have found is ConeCalc. Plug the large diameter , the small diameter and the height needed into the program and it will give you the layout for that cone. Just make sure you put the diameters in the proper slot. https://i-logic.com/conecalc/

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Re: Frustum of a cone

Post by Eire Whiskey » Wed Nov 06, 2019 12:13 pm

SpiritOf76 wrote:
Mon Sep 02, 2019 11:12 am
this website uses only imperial measurements, but it will create a template you can print and layout on your copper.

https://www.blocklayer.com/cone-patternseng.aspx
corene1 wrote:
Mon Sep 02, 2019 8:00 pm
Easiest layout I have found is ConeCalc. Plug the large diameter , the small diameter and the height needed into the program and it will give you the layout for that cone. Just make sure you put the diameters in the proper slot. https://i-logic.com/conecalc/
Both these are good. The plus side of the one is it's on your computer in case the internet fails, kinda common around here. Thanks

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Re: Frustum of a cone

Post by Bushman » Wed Nov 06, 2019 12:44 pm

I have a program called Rhinoceros that I use it allows me to make a 3D model which I can calculate the volume. From here I can do a roll-out that will lay it out in 2D with both the top and bottom. What it doesn’t do is add the tabs. I have done several layouts for other members along with my own build. It’s not a really high end software but is a bit expensive for just our use. I was given the software from the company as I used to do training for teachers in our state. I also used it for my dephlagmater and converted to CNC code to cut the parts.

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