[TheForge] eliptical rings on a cone mandrel?

[Bruce Freeman]

Dave,
Of course, I was pulling your leg.
As someone else pointed out, however, an elliptical cone WOULD have a
circular cross-section at one specific angle.  Accordingly, the use of a
lathe to turn one might be feasible.  But it would probably take some
sort of non-standard attachment or other to do it easily.
Bruce
NJ

>>> davesmucker at hotmail.com 11/20/2006 12:49 PM >>>
Bruce,

No lathe was used.  It has been a lot of years but my memory is that
Dad 
(and he did 90 percent of the work except final sanding and a finish
which I 
did) first cut a 4 sided shape on the table saw using a taper set up.  
It 
was a long piece of white pine that had a rectangular shaped base and
taper 
to a point at the top.  He then held the base in the vise and shaped
the 
tapered section using a block plane.  Working completely by eye.  I
then 
finished sanding it.  Last step was to cut it off at an angle so that
we got 
a circular base.  I got an A+ on the project.  (Teacher knew Dad did
most of 
the work, he just loved that someone was interested in such a thing.) 
Dad 
was a father, craftsman, and engineer in that order.  And he was a damn
good 
engineer.

Dave Smucker
----- Original Message ----- 
From: "Bruce Freeman" <FREEMAB at pt.fdah.com>
To: <theforge at mailman.qth.net>
Sent: Monday, November 20, 2006 9:52 AM
Subject: Re: [TheForge] eliptical rings on a cone mandrel?


> Your father machined this on his elliptical lathe, right?
>
>>>> davesmucker at hotmail.com 11/18/2006 5:02 PM >>>
> While on this subject here is an interesting variation.  You can make
a
> cone
> which appears elliptical in cross section when looking down on the
cone
> from
> above -- but cut at the correct angle its cross section will be a
> circle.
> With the help of my father who was a very good woodworker we shaped
> such a
> cone when I was in high school -- and presented it to my math
teacher.
> He
> loved it and always showed it to his advanced math classes.  Place
on
> this
> circular base the cone would sit at an angle.
>
> Dave Smucker
>
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