Hi all,

Basic question for anyone who has used one or more of the below....Assuming
"it's
a ~ manageable thickness ~, can "it", be cut with hand shears (?), or would
it require
a power shear (sheet metal brake) unit or service ?

Take care, Meredith

On Wed, Sep 3, 2008 at 5:21 PM, Charles R. Patton  wrote:

> Some years ago I got some Elinvar from Hamilton Precision metals.
>
> A quick search of the PSN discussions found probably the best summary by
> Karl Cunningham 20 Oct 1998.-----
> There are several alloys that exhibit near zero temperature coefficient of
> modulus of elasticity, at least over the range near room temperature.
> According to the Machinery Handbook, 22rd edition, they are:
>
> Elinvar (Trade name of Society Anon. de Commentry Fourchambault et
> Decazeville, Paris, France) -- The first constant-modulus alloy used for
> hairsprings in watches. Variations are known by Elinvar Extra, Durinval,
> Modulvar, and Nivarox.
>
> Ni-Span C (Trade name of International Nickel) -- Very popular
> constant-modulus alloy. Useful up to 60K - 80K psi stress.
>
> Iso-Elastic (Trade name of John Chatillon & Sons) -- Useful to 40K to 60K
> psi. Used in dynamometers, instruments, and food-weighing scales.
>
> Elgiloy (Trade name of Elgin National Watch Co) -- Also known as 8J Alloy,
> Durapower, and Cobenium. NON-MAGNETIC alloy useful up to 75K psi stress.
> Used in watches and instrument springs.
>
> Dynavar (Trade name of Hamilton Watch Co) -- Also NON-MAGNETIC. Similar
> characteristics and uses as Elgiloy.
>
> Regards,
> Charles Patton
>
>
Hi all,

Basic question for anyone who has used one or more of the below....Assuming "it's
a ~ manageable thickness ~, can "it", be cut with hand shears (?), or would it require


a power shear (sheet metal brake) unit or service ?

Take care, Meredith 

On Wed, Sep 3, 2008 at 5:21 PM, Charles R. Patton <charles.r.patton@........> wrote:


Some years ago I got some Elinvar from Hamilton Precision metals.



A quick search of the PSN discussions found probably the best summary by Karl Cunningham 20 Oct 1998.-----

There are several alloys that exhibit near zero temperature coefficient of

modulus of elasticity, at least over the range near room temperature.

According to the Machinery Handbook, 22rd edition, they are:



Elinvar (Trade name of Society Anon. de Commentry Fourchambault et

Decazeville, Paris, France) -- The first constant-modulus alloy used for

hairsprings in watches. Variations are known by Elinvar Extra, Durinval,

Modulvar, and Nivarox.



Ni-Span C (Trade name of International Nickel) -- Very popular

constant-modulus alloy. Useful up to 60K - 80K psi stress.



Iso-Elastic (Trade name of John Chatillon & Sons) -- Useful to 40K to 60K

psi. Used in dynamometers, instruments, and food-weighing scales.



Elgiloy (Trade name of Elgin National Watch Co) -- Also known as 8J Alloy,

Durapower, and Cobenium. NON-MAGNETIC alloy useful up to 75K psi stress.

Used in watches and instrument springs.



Dynavar (Trade name of Hamilton Watch Co) -- Also NON-MAGNETIC. Similar

characteristics and uses as Elgiloy.



Regards,

Charles Patton