Simple Cone Layouts

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PyroJoe
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Simple Cone Layouts

Post by PyroJoe » Fri Sep 10, 2010 3:49 pm

This is a simple method to layout cone sections. It is not new and can be found in various sites on the internet.
It is not a highly precise or accurate method, but should provide a general method for producing cone sections with limited resources.

One requirement is to start with a large piece of paper.
Draw your cone on the lower left corner with the base parallel and near the bottom of the sheet. As shown below:
Attachments
paper.JPG
paper.JPG (11.15 KiB) Viewed 5851 times

PyroJoe
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Re: Simple Cone Layouts

Post by PyroJoe » Fri Sep 10, 2010 3:52 pm

Next use a compass to draw a circle the same diameter as the base.

http://en.wikipedia.org/wiki/Compass_(drafting)

Math can be used to calculate the circumference.

If the math is not a option then a reasonable small easily shaped wire can be layed upon the circle and trimmed as precisely possible to fit the circle(circle#1).

The goal here is to create a wire the length of the circumference of the circle.
Attachments
cone1.JPG
Last edited by PyroJoe on Fri Sep 10, 2010 4:19 pm, edited 1 time in total.

PyroJoe
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Re: Simple Cone Layouts

Post by PyroJoe » Fri Sep 10, 2010 4:02 pm

Next draw line#1 and line#2 with a straight edge, make sure to look down the edge to insure it is straight!
This should create point#1.

Then Draw arc#1 and arc#2 with a compass.

Fit precisely as possible the wire onto arc#2 (use tape if needed of the type that won't tear the paper when removed). Then place a dot at the end to the right where the wire ends.

Draw Line#3 from point#1 to the dot with straight edge.
Attachments
cone2.JPG
Last edited by PyroJoe on Fri Sep 10, 2010 5:59 pm, edited 3 times in total.

PyroJoe
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Re: Simple Cone Layouts

Post by PyroJoe » Fri Sep 10, 2010 4:06 pm

This should create a template (shown shaded) to construct the cone section.
Attachments
cone3.JPG

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Re: Simple Cone Layouts

Post by PyroJoe » Fri Sep 10, 2010 5:40 pm

Generally compass are to small to make these type arcs, so what I will do in a pinch, is take a thin piece of wood and drill a slightly undersized hole, then hammer a nail in one end.

Then drill 2 small holes to match the arc radius needed.

Looks something like this:
Attachments
comp.JPG

WebPilot
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Re: Simple Cone Layouts

Post by WebPilot » Sun Sep 19, 2010 7:40 am

  1. the geometric construction of a truncated cone may be found in a sheet metal worker's handbook and
  2. use ps as a drawing tool.
Image

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Re: Simple Cone Layouts

Post by PyroJoe » Mon Sep 20, 2010 3:58 pm

This topic is generally dedicated to "simple" and "limited resources".
As a challenge can anyone provide a simpler solution with fewer resources?

Thinking about it, if the sheet metal was large enough, the paper could be omitted.

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Re: Simple Cone Layouts

Post by WebPilot » Fri Oct 29, 2010 1:00 pm

PyroJoe wrote:This topic is generally dedicated to "simple" and "limited resources".
Precisely why I chose and suggested PS.
Image

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Re: Simple Cone Layouts

Post by PyroJoe » Fri Oct 29, 2010 1:33 pm

Ok for the sake of thoroughness, I'll bite.

PS is a acronym for?

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Re: Simple Cone Layouts

Post by WebPilot » Fri Oct 29, 2010 2:07 pm

We discussed it some 10 mos. ago in the thread, patterns.

This is ¼ size.

Image

The "tools" are free and work on most OSes.
Image

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Re: Simple Cone Layouts

Post by PyroJoe » Fri Oct 29, 2010 2:30 pm

Ah, PostScript
10 months ago, Iv'e slept at least twice since then, ha

I made a couple presumptions in the above that many folks don't own a computer or printer.

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Re: Simple Cone Layouts

Post by PyroJoe » Tue Jul 26, 2011 1:42 pm

Instead of constructing a compass, a tape measure can be used to measure off POINT #1 marking dots on the measure of ARC#1 and ARC#2. Just connect the dots and you have it.

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Re: Simple Cone Layouts

Post by hinote » Tue Jul 26, 2011 4:41 pm

Here's my simple answer:

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

Also, a set of "trammels" is available from several sources such as this:

http://www.amazon.com/gp/product/B00004 ... CTBPJ6A7YW

I just clamp them to an aluminum ruler and adjust to size.

Hope this helps!

Bill

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