[TheForge] shrink fit techniques

Fri Feb 1 10:44:11 2002

My experience with shrink fits is in steam and gas turbine assembly
techniques. 
In my experience the practice was always, make the dowel bigger than the
hole, depending on the shrink fit desired, and then shrink the dowel with
dry ice in a zylene bath and slip the dowel in before it warms back up. Once
its in, its in, and any errors require drilling.

Heating a hole to expand it never works reliably, because if you are not
careful where you start heating, you will actually shrink the hole.

Ray Miller
Cincinnati

-----Original Message-----
From: RW [mailto:[email protected]]
Sent: Friday, February 01, 2002 10:15 AM
To: [email protected]
Subject: [TheForge] shrink fit techniques

I'm having varying degrees of success attaching metal parts together by the
use of drilled holes filled with metal dowels using heat and a quench as the
"adhesive".  If I heat 1 1/2" solid and insert a cold 1/4 or 3/8" dowel and
quench, the result is a tight secure joint.  But when I insert this piece
(cold) into another  "hot hole" and quench, the second joint is not as tight
as the first joint .  I really like this approach for many applications and
would like to perfect the "shrink fit technique".  Any knowledge and
experience with this technique is most welcome and appreciated.
RW

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