Thanks for all the sites, pictures and info, GUYS. If I get some time I =
may try modifying my Lehman with the wire or flexure hinge replacement =
(as opposed to the current steel ball bearing). There is so much good =
info coming from this group (in the past, Roger Sparks was a tremendous =
help to me concerning the building of his "C Spring" seismometer). =
http://www.fairpoint.net/~sparksite/CSpring%20Seismometer.html=20
If I start this project i'm sure I will be needing your help too. =
Thanks again, Ed. =20
----- Original Message -----=20
From: Barry Lotz=20
To: psn-l@.................
Sent: Sunday, June 06, 2010 10:57 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=20
"standard" Lehman. Ed.
----- Original Message -----=20
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 =3D> 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
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more =
information.
=
-------------------------------------------------------------------------=
-------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.437 / Virus Database: 271.1.1/2920 - Release =
Date: 06/05/10=20
18:25:00
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with=20
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more =
information.
=20
-------------------------------------------------------------------------=
-----
No virus found in this incoming message.
Checked by AVG - www.avg.com=20
Version: 8.5.437 / Virus Database: 271.1.1/2921 - Release Date: =
06/06/10 06:25:00
Thanks for all the sites, pictures and =
info,=20
GUYS. If I get some time I may try modifying my Lehman with =
the wire=20
or flexure hinge replacement (as opposed to the current steel ball =
bearing).=20
There is so much good info coming from this group (in the past, =
Roger=20
Sparks was a tremendous help to me concerning the building of =
his=20
"C Spring" seismometer). h=
ttp://www.fairpoint.net/~sparksite/CSpring%20Seismometer.html
If I start this project i'm sure I will =
be=20
needing your help too. Thanks again, Ed.
----- Original Message -----
From:=20
Barry=20
Lotz
Sent: Sunday, June 06, 2010 =
10:57=20
PM
Subject: Re: Wire =
Strength
Hi Ed
Here is one possibility shown =
on my=20
website. It is taken from the Sprengnether design.
http://www.seismicvault.com/images/HINGE_12H.jpg It's =
a=20
little hard to see but the wire is between the two small =
aluminum=20
blocks. There are two scribe points to provide some additional =
vertical=20
adjustment.
Regards
Barry
http://www.seismicvault.com
---=20
On Sun, 6/6/10, Edward Ianni =
<edwianni1@...........>=20
wrote:
From:=20
Edward Ianni <edwianni1@...........>
Subject: Re: =
Wire=20
Strength
To: psn-l@..............
Date: Sunday, June 6, =
2010,=20
4:49 AM
How would the "wire" actually be setup =
or=20
configured physically in the
"standard"=20
Lehman. Ed.
----- Original Message =
-----=20
From: "Brett Nordgren" <brett3nt@.............>
To: <psn-l@..............>
Sent: Sunday, =
June 06,=20
2010 11:03 AM
Subject: Re: Wire Strength
>=20
Geoff,
>
> Try http://www.smallparts.com/ and=20
search for "17-7 PH Spring Wire"
>
> As sold, in=20
"Condition C" it has a yield strength of over 190,000 =
psi
> and=20
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=20
that. The 17-7
> material we use for leaf springs =
gets a=20
yield strength close to
> 300,000 psi after=20
baking.
>
> The material property you want to be =
looking=20
at is yield
> strength. As defined by AK =
Steel
>=20
corp.
> http://www.aksteel.com/pdf/markets_products/stainless/prec=
ipitation/17-7_PH_Data_Sheet.pdf
>=20
it is the stress level at which the material will permanently=20
stretch
> by 0.2%. You could stress a wire to half =
that=20
value reasonably safely.
> In some places yield stess is =
defined=20
at 2% or even 5% permanent
> stretch, so you should be =
aware of=20
which one is being used. In any
> case, working at =
40-50%=20
of yield is likely to be OK.
>
>=20
Brett
>
>
> At 02:30 AM 6/6/2010, you=20
wrote:
>>Does anyone understand wire strength=20
?
>>
>>I will look at this=20
way.
>>
>>HY80 steel has the ability to =
stand up=20
to
>>80,000 lb/in^2 so you just =
translate
>>say the=20
area of a given steel wire
>>what it would be if =
whatever=20
weight
>>was on that area as translated =
to
>>the=20
area of the wire guage then if it is
>>like 1/2 the =
yield=20
strength 40,000 lb/in^2 you should be ok =
??
>>
>>5=20
lb on a 28GA wire might translate to
>>Diameter =
=3D>=20
2*SQR(weight/(PI * 40000))
>>Where HY80 type steel is =
the=20
wire steel ?
>>Maybe 28 or less AWG steel wire. (you =
need an=20
AWG table)
>>
>>If it were piano wire it =
might be=20
HY160
>>or something better than plain steel=20
?
>>
>>IS there such a thing as stainless =
steel=20
wire
>>or something that will not corrode/rust=20
?
>>
>>Does any of that sound right=20
?
>>
>>I think like a LAYMAN and not Lehman=20
:-)
>>
>>Thanks ahead of=20
time,
>>geoff
>
>
>=20
=
__________________________________________________________
>
>=
;=20
Public Seismic Network Mailing List (PSN-L)
>
> To =
leave=20
this list email PSN-L-REQUEST@..............=20
with
> the body of the message (first line only):=20
unsubscribe
> See http://www.seismicnet.com/maillist.html for =
more=20
=
information.
-------------------------------------------------=
-------------------------------
No=20
virus found in this incoming message.
Checked by AVG -=20
www.avg.com
Version: 8.5.437 / Virus Database: 271.1.1/2920 =
-=20
Release Date: 06/05/10=20
=
18:25:00
_____________________________________________________=
_____
Public=20
Seismic Network Mailing List (PSN-L)
To leave this list =
email=20
PSN-L-REQUEST@.............. with =
the body of=20
the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for =
more=20
=
information.
No virus found in this incoming message.
Checked by AVG =
-=20
www.avg.com
Version: 8.5.437 / Virus Database: 271.1.1/2921 - =
Release=20
Date: 06/06/10 06:25:00