[TheForge] shrink fit techniques

Fri Feb 1 11:31:00 2002

Ray, makes sense.
RW
----- Original Message -----
From: Miller, Ray (GEAE) <[email protected]>
To: <[email protected]>
Sent: Friday, February 01, 2002 11:24 AM
Subject: RE: [TheForge] shrink fit techniques


> 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
> >
> > _______________________________________________
> > http://mailman.qth.net/mailman/listinfo/theforge
> > theforge mail list group photo site is
> > http://www.photoaccess.com
> > Login:  [email protected]
> > password:  anvil
> > ___________
> >
> > _______________________________________________
> > http://mailman.qth.net/mailman/listinfo/theforge
> > theforge mail list group photo site is
> > http://www.photoaccess.com
> > Login:  [email protected]
> > password:  anvil
> > ___________
> >
> >
> >
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  [email protected]
> password:  anvil
> ___________
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  [email protected]
> password:  anvil
> ___________
>
>
>