Hi Rick
I think I would find a strip that was not sheared.
I got some CRS strips that are rolled on all 4 sides.
I think it would not take much to true them up.
Keith
Deep Run Portage
Back Shop
" The Lizard Works"
--- On Sun, 1/2/11, Rick Sparber <rgsparber@aol.com> wrote:
From: Rick Sparber <rgsparber@aol.com>
Subject: RE: [gingery_machines] new article: Making it Dead Flat and Square
To: gingery_machines@yahoogroups.com
Date: Sunday, January 2, 2011, 7:54 AM
David,
I seem to recall that the Steinway Piano company leaves their castings
outside for many years before using them.
The strap I have was sheared into strips. Not sure what difference that
makes but I will find out soon enough.
Rick
-----Original Message-----
From: gingery_machines@yahoogroups.com
[mailto:gingery_machines@yahoogroups.com] On Behalf Of David Frantz
Sent: Sunday, January 02, 2011 6:36 AM
To: gingery_machines@yahoogroups.com
Subject: Re: [gingery_machines] new article: Making it Dead Flat and Square
Cast Iron is just as subject to internal stress as any other material.
Especially freshly cast iron. However like a lot of castings iron will age
and stress relieve over time. Locally some of the old tool manufactures
would literally throw the castings outside for the winter to allow the
extreme temperature changes to accelerate release of stress.
So don't assume that stress isn't there in cast iron. It amy behave
differently than cold rolled for example but it can cause you grief. The
older the casting the less residual stress and thus why some people make
straight edges out of old ways. It is also why buying an old machine that
is in good condition is often a good idea.
Dave
[Non-text portions of this message have been removed]
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