I wish Id thought Of that.

----- Original Message ----- 
From: "Dale Hardy" 
To: 
Sent: Tuesday, June 08, 2010 12:28 AM
Subject: Wire Strength


> 
> 
> 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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