[TheForge] shrink fit techniques

Fri Feb 1 13:01:01 2002

You could probably get away with a dry ice/alcohol bath, and observe the
obvious fire hazard.
If you are shrinking small stuff, liquid nitrogen is also an option.
Ray

-----Original Message-----
From: RW [mailto:[email protected]]
Sent: Friday, February 01, 2002 11:46 AM
To: [email protected]
Subject: Re: [TheForge] shrink fit techniques

Ray, is dry ice in a zylene bath something readily doable in a small one-man
shop?  What precautions should one take?    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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