[TheForge] eliptical rings on a cone mandrel?

[Bruce Freeman]

It's not a bad idea.  You'd be limited in the shorter dimension of the
ellipse, but not in the longer.
Bruce
NJ

>>> feorge at kc.rr.com 11/18/2006 10:17 AM >>>
couldn't you just use the appropriate  sized pipe or round tubing.... 

a cylinder and fid your pitch on there for the size(length) of the  
inside of your elipse and form it around that....

feorge


On Nov 17, 2006, at 6:06 PM, Rick wrote:

> You could form half, the turn it around and form the other half.   
> That should work.
>
> |8^)>
> Rick Crawford at Rafter Lazy C
>  Home of Smoky Forge and Lem the Wonder Mule
>   In the middle of Northern Illinois
>
>    http://www.smokyforge.com 
>     rick at smokyforge.com 
>
>
>
>
> ----- Original Message ----- From: <wmullett at bright.net>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Friday, November 17, 2006 3:23 PM
> Subject: Re: [TheForge] eliptical rings on a cone mandrel?
>
>
>> The ellipse formed by a cone is not symmetrical.
>>
>>>
>>> From: "Bruce Freeman" <FREEMAB at pt.fdah.com>
>>> Date: Fri Nov 17, 9:45 AM
>>> To: <theforge at mailman.qth.net>
>>> Subject: [TheForge] eliptical rings on a cone mandrel?
>>>
>>> I don't happen to have a cone mandrel, so can't try this myself.  

>>> I'm
>>> hoping someone can give it a quick try and let the rest of us  
>>> know how
>>> it works:
>>>
>>> Those of you who suffered through algebra are aware of the "conic
>>> sections" - shapes that can be derived mathematically from a  
>>> cone.  The
>>> circle, for example is a horizontal slice through a cone.   
>>> Blacksmiths
>>> make use of this by using a cone mandrel to make perfectly
circular
>>> rings.
>>>
>>> What is not so obvious is that the elipse, the parabola, and the
>>> hyperbola are all also conic sections.  If look at a cone from  
>>> the side,
>>> it's a triangle.  (Mathematically, it's two triangles, one upside 

>>> down
>>> atop the other, but we don't have to bother about that.  One  
>>> "half-cone"
>>> will do.)  Draw a horizontal line through this triangle (i.e., of 

>>> the
>>> cone), and, as I said above, you've got a circle on the cone. 
Draw
>>> vertical line through this triangle and you have a parabolic  
>>> curve on
>>> the cone - interesting, but probably not too useful.  (And the  
>>> hyperbola
>>> is even worse.)
>>>
>>> But an elipse is also possible.  An elipse arises from an angle  
>>> between
>>> horzontal and vertical.  And they're really cool shapes.
>>>
>>> So, make a ring.  Round it up on the cone.  Then take it off the  
>>> cone
>>> and hammer it from the side to make it somewhat oblong.  Put it  
>>> back on
>>> the cone and hold it at an angle (say, 30 to 60 degrees from  
>>> horizontal)
>>> and "elipse" it up on the cone.  Got that?
>>>
>>> If some interested folk could try this out and report back, I'd  
>>> like to
>>> hear about it.
>>>
>>> (I suspect the trick to make this practical might be to make it
>>> narrower than wanted on the anvil, as the thing will tend back to 

>>> round
>>> on the cone.  It also may be necessary to take it off the cone
>>> occassionally to flatten the plane of the ring against the anvil.)
>>>
>>> Bruce
>>> NJ
>
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