[TheForge] Spiral staircases

Fri May 16 00:19:00 2003

I brought this up once before but never posted it, I got this info from the
hammers blow summer 1992. I'll see if I can type in the formulas in a manner
that make sense.
.
lerngth=sqrt[(2pi RN)sqrd+h sqrd]

radius of bend=( Rsqrd+ [h divided by2pi N]sqrd) divided by R

twist, degrees/ ft. or inch, or whatever units you use=57.3h divided by[R
sqrd+(h divided by 2pi h)sqrd]2pi N

N= no. of turns eg. 450degres =1.25 turns

h= height

R= radius of the rail

So cut the material to length, bend it to the calculated radius, which is
larger than the radius of the stair, then twist, when the twist is right the
rail will fit onto the steps perfectly.
I've used this on 3 spiral stairs and several spiral whatnots and it works.

Randy Mundt
----- Original Message -----
From: "gblacksmith" <[email protected]>
To: <[email protected]>
Sent: Thursday, May 15, 2003 9:59 AM
Subject: [TheForge] Spiral staircases

Thought I have yet to do one, I am interested in building spiral staircases.
What is a good method of calculating the length of material needed for, and
the manner of bending the hand rail on these?

Also, any info on constructing spiral staircases would be helpful.  Thanks.

                                Grant Marcoux

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