I really wish

[Mike Armstrong]

people wouldn't talk about "hex barrels" when they mean octagon barrels. There really aren't many hexagonal barrels out there. And "hex" means "witch" (I've had barrels that seemed "hexed" but none of them was hexagonal....).

I know--picky, picky, picky.

 

[Pat-inCO]

"Hex" is also short hand for hexagonal, or six sided.

Found this interesting (at least to me) definition of how it is formed.

 

[blume357]

Off topic I know but is there a way to draw out a 9 sided one... I actually need that for my work...
You cut out a nine sided like above... cut the radius of one of the points to the center and then fold one of the 9 sections under and you have an 8 sided lid for a round chimney cap... It's easy to do 8 which then folks in to 7.
Hex was also the Northern European word for different star symbols put on buildings to ward off evil.

 

[Selena]

Off topic I know but is there a way to draw out a 9 sided one... I actually need that for my work...
You cut out a nine sided like above... cut the radius of one of the points to the center and then fold one of the 9 sections under and you have an 8 sided lid for a round chimney cap... It's easy to do 8 which then folks in to 7.
Hex was also the Northern European word for different star symbols put on buildings to ward off evil.

Unfortunately Gauss proved it's only possible to draw polygons that are multiples of 2 with a compass and straightedge. The trick would be to draw a "flower of life"(6 points), trisect it (18 points) then draw to every other point.(9 points)

 

[427mach1]

Unfortunately Gauss proved it's only possible to draw polygons that are multiples of 2 with a compass and straightedge. The trick would be to draw a "flower of life" then trisect it.

When I was young, my mother's cousin wrote a paper on "How to trisect an angle using only a straight-edge and compass." He tried to get it reviewed by mathematicians but I don't believe he was ever successful. At the time, I hadn't hadn't taken enough math courses to understand it; I was probably still in junior high school. Having two engineering degrees, I could probably force my way through it now to disprove it, if only I could find a copy of it!

 

[Dan in MI]

360/9 = 40. Mark every 40* from a center point.

edit --Ok re-thinking without actually drawing you may need 10 points for nine sections, then it would be 36*.

 

[Selena]

Unfortunately Gauss proved it's only possible to draw polygons that are multiples of 2 with a compass and straightedge. The trick would be to draw a "flower of life" then trisect it.

When I was young, my mother's cousin wrote a paper on "How to trisect an angle using only a straight-edge and compass." He tried to get it reviewed by mathematicians but I don't believe he was ever successful. At the time, I hadn't hadn't taken enough math courses to understand it; I was probably still in junior high school. Having two engineering degrees, I could probably force my way through it now to disprove it, if only I could find a copy of it!

OK, "flower of Life" is using the compass to start at some point on the circle then use that point to draw another circle the same radius, then continuing wherever the circles intersect. Continue with the "outer circles" until you have a figure with 18 points. From there you can use every other point to draw 9 lines to the center. Drawing a circle the size of your work-piece you can use the lines to draw your nonogram for a template to cut the cap. You aren't really trisecting the angle as cutting an expanded series of circles into 6 segments.

 

[coach]

So much easier to draw any multi sided figure using autocad.

 

[Mike Armstrong]

So "sometimes you're the bug, and sometimes you're the windshield.' And sometimes you get a free geometry lesson!

Those star-like signs the people all over the world used to put on buildings (and sometimes on themselves) were and are associated with witchcraft, it's true. But you gotta remember that in the old times, and still in many places, the word "witch" can mean someone who uses magic for evil or for good. And sometimes one person's evil is another's good!

OK, so now explain why so many of us gun people regularly write "repo" for "repro" as in the "Uberti 1885 is a repo of the original Winchester design by John Browning"? (I briefly worked as a repo man in the 1960s and was lucky to live long enough to repro....).

 

[caryc]

One of the neatest books I ever bought at a garage sale was a 1090 page book on "Sheet Metal Pattern Layout". It was printed in 1942.

It shows how to draw a flat pattern for almost anything you can think of. Here are a few pages from it. It shows you a picture of the item and then explains how to draw the flat pattern for it. At the end of the book it has a whole section on "Geometric Problems and Mensuration" In the last picture you see an example of how to draw tangent circles tangent to two inclined lines, then explains exactly how to do it.

 

[Mega Twin]

Most days I have trouble drawing my name

 

[Dan in MI]

That book is COOL. Need to start looking for that. My FiL was a metal model maker, he knew all that stuff.

 

[Colonel Daddy]

Most days I have trouble drawing my name

AHHHHHH!! Something I can finally relate to

 

[blume357]

One of the neatest books I ever bought at a garage sale was a 1090 page book on "Sheet Metal Pattern Layout". It was printed in 1942.

It shows how to draw a flat pattern for almost anything you can think of. Here are a few pages from it. It shows you a picture of the item and then explains how to draw the flat pattern for it. At the end of the book it has a whole section on "Geometric Problems and Mensuration" In the last picture you see an example of how to draw tangent circles tangent to two inclined lines, then explains exactly how to do it.

Damn Caryc, I don't suppose you'd want to pass that book on?

 

[caryc]

One of the neatest books I ever bought at a garage sale was a 1090 page book on "Sheet Metal Pattern Layout". It was printed in 1942.

It shows how to draw a flat pattern for almost anything you can think of. Here are a few pages from it. It shows you a picture of the item and then explains how to draw the flat pattern for it. At the end of the book it has a whole section on "Geometric Problems and Mensuration" In the last picture you see an example of how to draw tangent circles tangent to two inclined lines, then explains exactly how to do it.

Damn Caryc, I don't suppose you'd want to pass that book on?

Sorry guys, someone already email me wanting to own that book and I promised it to him. If you do an Amazon search on "Sheet Metal Pattern Layouts" you can find examples of the book. It the Audels book with the big black cover. Mine was printed in 1942. I guess it was also reprinted after that. Prices can be a bit expensive though.

 

[Colonialgirl]

A lot of the old Pennsylvania Dutch Barns in that state USE to have HEX symbols on them to ward off evil and promote good luck.