A good source of foil is from "Feeler Gauges", as used to set spark plug
gaps in engines, very cheap and a range of thicknesses to select from.



-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Geoffrey
Sent: Monday, 7 June 2010 9:23 AM
To: psn-l@..............
Subject: Re: Wire Strength

Where the heck do you guys get your stuff ?
I see like 1/4 inch thick Aluminum bent
professionally on a break of some kind
which is beyond the capability of any
amateur known to myself ??


----- Original Message ----- 
From: "Barry Lotz" 
To: 
Sent: Sunday, June 06, 2010 3:57 PM
Subject: Re: Wire Strength


Hi Ed
Here is one possibility shown on my website. It is taken from the
Sprengnether design.
http://www.seismicvault.com/images/HINGE_12H.jpg It's a little hard to see
but the wire is between the two small aluminum 
blocks. There are two scribe points to provide some additional vertical
adjustment.

Regards
Barry
http://www.seismicvault.com

--- On Sun, 6/6/10, Edward Ianni  wrote:

From: Edward Ianni 
Subject: Re: Wire Strength
To: psn-l@..............
Date: Sunday, June 6, 2010, 4:49 AM

How would the "wire" actually be setup or configured physically in the
"standard" Lehman. Ed.


-----
 Original Message ----- 
From: "Brett Nordgren" 
To: 
Sent: Sunday, June 06, 2010 11:03 AM
Subject: Re: Wire Strength


> Geoff,
>
> Try http://www.smallparts.com/ and search for "17-7 PH Spring Wire"
>
> As sold, in "Condition C" it has a yield strength of over 190,000 psi
> and if you want to bake it for an hour at 900 F you can raise that to
> 260,000, and it will possibly get even higher than that. The 17-7
> material we use for leaf springs gets a yield strength close to
> 300,000 psi after baking.
>
> The material property you want to be
 looking at is yield
> strength. As defined by AK Steel
> corp.
>
http://www.aksteel.com/pdf/markets_products/stainless/precipitation/17-7_PH_
Data_Sheet.pdf
> it is the stress level at which the material will permanently stretch
> by 0.2%. You could stress a wire to half that value reasonably safely.
> In some places yield stess is defined at 2% or even 5% permanent
> stretch, so you should be aware of which one is being used. In any
> case, working at 40-50% of yield is likely to be OK.
>
> Brett
>
>
> At 02:30 AM 6/6/2010, you wrote:
>>Does anyone understand wire strength ?
>>
>>I will look at this way.
>>
>>HY80 steel has the ability to stand up to
>>80,000 lb/in^2 so you just
 translate
>>say the area of a given steel wire
>>what it would be if whatever weight
>>was on that area as translated to
>>the area of the wire guage then if it is
>>like 1/2 the yield strength 40,000 lb/in^2 you should be ok ??
>>
>>5 lb on a 28GA wire might translate to
>>Diameter => 2*SQR(weight/(PI * 40000))
>>Where HY80 type steel is the wire steel ?
>>Maybe 28 or less AWG steel wire. (you need an AWG table)
>>
>>If it were piano wire it might be HY160
>>or something better than plain steel ?
>>
>>IS there such a thing as stainless steel wire
>>or something that will not corrode/rust ?
>>
>>Does any of that sound right ?
>>
>>I think like a LAYMAN and not Lehman :-)
>>
>>Thanks ahead of time,
>>geoff
>
>
>
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