Dave;
You might try aluminum "tooling plate"-- it is made specifically for
maintaining dimensional stability after machining. It is a special grade of
stress-relieved cast aluminum plate.
Regards, Neil Tucson, AZ
-----Original Message-----
From: Dave Dahlgren [mailto:ddahlgren@snet.net]
Sent: Saturday, December 14, 2002 11:56 AM
To: Rick Byrnes
Cc: Paul Bland; Twin Jugs Cycle; lsr; Clay, Dale; "Chris \"Dad\" Land";
gary baker
Subject: Re: Cryogenics
The real success or failure of the investment will be on the first rebuild.
If
the cylinders are still very round and the line bore good and no cracks then
a
good investment. If not money for nothing. I have been looking into the same
subject to see if i can stress relieve aluminum before machining.. I have
had
some billets that machined perfect and others that curled up like a banana
when
making a housing for a slide throttle. All the metal was from a US company
and
not a re-pour. Seems the best parts are made out of stock that has been in
the
rack for years either mine or the supplier. A large high volume distributor
gives me the worst and a small low volume place the best. Metals as
manufactured
have a lot of stress in them and removing it is a big deal to hold shape as
well
as fatigue strength. As you get rid of the stress in the material parts can
and
are made lighter and stronger. I have heard that when Carrillo makes a set
of
rods there are many stress relieving steps between machining operations. I
also
suspect that is one of the differences between copies and the original
parts.
The copies are cheap but are all the stress relieving steps taken. Might
look
the same but be completely different parts.
Dave
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