[TheForge] shrink fit techniques

Fri Feb 1 11:25:59 2002

Sounds wrong, I know, but let's say you have a 1" thick plate with a 1" hole
drilled in it.
AS you start heating the hole, the metal will expand. The cold metal around
the outside of the heated area isn't going anywhere, so the only path of
expansion of the hot metal is into the hole, closing up the diameter. 
Ray

-----Original Message-----
From: RW [mailto:[email protected]]
Sent: Friday, February 01, 2002 11:20 AM
To: [email protected]
Subject: Re: [TheForge] shrink fit techniques

Ray, how could heating a hole shrink it?  RW

----- Original Message -----
From: Miller, Ray (GEAE) <[email protected]>
To: <[email protected]>
Sent: Friday, February 01, 2002 10:41 AM
Subject: RE: [TheForge] shrink fit techniques

> 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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