Re: ATM Re: string spiders

["rguinamard" <rguinamard@infonie.fr>]

I have also noticed that guitar string seems more resistant than the
standart steel I've used once (it was in a roll). The standart steel 0.01"
broke much more easily than the 0.01" guitar string.
I think guitar string is not stainless 304 or 316L. I've been told that it's
a special steel like the piano string, a steel with high resistance.

I don't know the steel 18-8 you are speaking about. Does anyone knows the
equivalence in europe?

Raphaël Guinamard
----- Original Message -----
From: Daniel Fundo <fundo@bellsouth.net>
To: rguinamard <rguinamard@infonie.fr>
Cc: <atm@shore.net>
Sent: Tuesday, October 23, 2001 3:26 PM
Subject: Re: ATM Re: string spiders


> << In order to test the minimum diameter of the guitar string for my 3"
> secondary (rebuilding of my 13" f/4.5) , I've tried strings of 0.008" ,
> 0.010" and 0.012".
> Both the 0.008" , 0.010" broke. It seems the 0.012" is the limit to
> avoid breaking of the wires for my 550 g mirror, but I'm pretty sure the
> 0.010" could be use for a 10" or less telescope >>
>
> Raphael, I had the same problem when I used some 0.010" wire of unknown
> type.  There are several different strengths out there. Stainless type
> 304V has a tensile strength of only 135,000 pounds per square inch,
> Stainless 316V is 220,000 Lbs/sq.in.,  Stainless spring wire 17-7 PH is
> around 335,000 Lbs/sq.in., and stainless 18-8 (what I use) is 282,000+
> Lbs/sq.in. (All of these numbers are from the Small Parts Inc. catalog
> #18.  You can get the 18-8 in 30 ft. coils for $1.95. (standard
> disclaimer)
>
> I don't know what type is used for guitar strings, but once you start
> handling them, they begin to weaken.
>
> Someone mentioned once about painting or dulling the wires.  All you
> have to do is get a little human sweat and body oil on them and they
> will dull very nicely!!!
>
> *****-----
> Dan F.
> Secretary/MAS
> Memphis, TN
>
>
>