[TheForge] spirialstairs

[R.C.Mundt]

Hello Dan;
 I heard of someone else making auger flights this way, must have been
pretty huge, they rolled it then stretched it out w/ a crane.  I think this
would work good for a spiral stair railif the rail made  a full turn or 2
full turns etc.
The rail I'm currently working  only makes  about a quarter turn, the curve
isn't uniform therfore the twist isn't uniform.
I don't have a roller but bend  the curves in a press, making a bunch of
small bends, I usually run a piece through the press 3-4 times ( if the
curve i s uniform) then a little hammer work, the curves really go pretty
good. It's the twisting that gets to be time consuming. I guess the real
problem is that of measuring the twist or knowing how much to twist it. On
the press I use an adjustable stop so each bend is the same, if it is not
enough I move the stop and run it through again.
Randy Mundt
----- Original Message -----
From: <DanCruzan@aol.com>
To: <theforge@mailman.qth.net>
Sent: Sunday, January 26, 2003 8:50 AM
Subject: Re: [TheForge] spirialstairs


> I've never made a spiral stair rail, but I have made a few pieces of
reverse
> spiral flighting to go around other flighting to make mixing augers. I did
it
> by computing the length of material needed for one revolution using
> A(squared) +B (squared) = C(squared). In terms for the stairs, A=
> circumference of the centerline if the handrail for 1 revolution, B= the
rise
> for 1 revolution and C= the length if handrail for 1 revolution. Take C
> length of handrail and bend it the hardway into a circle. This circle will
> have a larger radius that the desired finished radius of the rail of
course.
> Now here is is the neat part. Stand the circle up vertically and pull the
two
> ends of the material in opposite directions being careful to redirect your
> pull frequently so that the pull is perpendicular to the plane that the
> circle of material was originally standing in. Also be careful the
material
> is not unduly influence by pulling it "against" the floor. When the two
ends
> have been pulled apart sufficiently to equal the rise of one revolution
the
> radius will be what you need for the rail. When making auger flighting I
> hooked one end of the material to a tractor and the other end to a
forklift
> using a come-along to do the pulling. Also of course we did several
> revelations at once simply by rolling the material in a continuous piece
so
> that several circles were together. It might not work for a spiral rail
but I
> think it would and it worked well when I made that flighting.
>
> Dan Cruzan
> From the real NJ
>
>
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