[AT] OT: Rosebuds! The oxi-acetylene kind...

Recentjester at aol.com Recentjester at aol.com
Fri Nov 15 05:48:21 PST 2013 

heating and pulling a gear off a shaft like that. soak it with  penetrating 
oil...clean it very well shiney on the shaft, have the key up heat  the 
outside lightly I think a rosebud is overkill unless its a huge gear. we  used 
to boil cam gears in old oil in a cut 55 gallon drum smoked but gear would  
slip on or in your case off.
 
 
In a message dated 11/15/2013 7:17:10 A.M. Central Standard Time,  
soffiler at gmail.com writes:

Thing  is, gears are case-hardened.  If you re-heat them (the BBQ fire in
the  tranny) to the point that you damage the case hardness, what you've
done is  converted the surface microstructure to a less desirable, softer
form of  carbon steel, but the surface is still carbon-enriched.  A second
heat  treatment would have to be done with care.  Some of the carbon  from
the original case hardening is going to want to diffuse further into  the
base material, meaning your second heat-treat process is going to need  to
be a case-hardening process again, in order to get the surface  hardness
back up, BUT, the case depth is going to increase, and this is  likely to
make the gear teeth brittle and prone to  fracture.

SO



On Fri, Nov 15, 2013 at 7:19 AM, charlie  hill 
<charliehill at embarqmail.com>wrote:

> Possibly Tom.   I really don't know for sure about that.  Just
> know what I've  seen done and what I've done.  As for the
> effect on the temper of  the steel and the metallurgy, I won't
> argue with you about that.   You may well be correct.
> However, they can be heat treated  again.
>
> Charlie
>
> -----Original  Message-----
> From: Tom
> Sent: Friday, November 15, 2013 1:03  AM
> To: Antique tractor email discussion group
> Subject: Re:  [AT] OT: Rosebuds! The oxi-acetylene kind...
>
> Only one problem,  Charlie, the gear teeth will be the first to heat.
> So they will lose  their temper before the hubs will be hot enough to
> free on the  shafts.
>
> Tom
>
>
>
>
>
>  >________________________________
> > From: charlie hill  <charliehill at embarqmail.com>
> >To: Antique tractor email  discussion group 
<at at lists.antique-tractor.com>
> >Sent:  Friday, 15 November 2013 12:43 PM
> >Subject: Re: [AT] OT: Rosebuds!  The oxi-acetylene  kind...
> >
> >
> >Tom I  don't think you have to get them that hot in terms of max temp.
>  >You just have to get enough heat into the mass of metal to make the  
metal
> >expand and break the joint loose.  When you have a big  mass of metal it
> >takes
> >a lot of BTU's.
>  >
> >Charlie
> >
> >-----Original  Message-----
> >From: Tom
> >Sent: Thursday, November 14,  2013 6:27 PM
> >To: Antique tractor email discussion group
>  >Subject: Re: [AT] OT: Rosebuds! The oxi-acetylene kind...
>  >
> >One would have to wonder how hard the gears & shafts were  after that
> >experience!
> >
> >Tom
>  >
> >
> >
> >
> >
>  >>________________________________
> >> From: Mike  <meulenms at gmx.com>
> >>To: Antique tractor email discussion  group 
<at at lists.antique-tractor.com
> >
> >>Sent:  Friday, 15 November 2013 12:05 PM
> >>Subject: Re: [AT] OT:  Rosebuds! The oxi-acetylene  kind...
> >>
>  >>
> >>Interesting that you would bring that up Charlie, I  was watching RFD-TV
> >>the other night and they were interviewing  a guy that had restored 
Power
> >>Horse tractors.. Parts are  apparently very hard to get for those
> >>tractors, you either  need to make them or have a parts tractor. Anyway,
> >>he said  when he got it the transmission gears were seized up, so he
>  >>filled the transmission with charcoal briquets and let it burn,  same
> >>type of idea. Those are neat little tractors by the way,  made to be
> >>controlled just like a horse using reins to control  the tractor via two
> >>levers.
> >>Mike M
>  >>
> >>On 11/14/2013 7:22 AM, charlie hill wrote:
>  >>> Dave if the part is such that you can do it without messing  
something
> >>> else
> >>> up
>  >>> you might find you have better success, and cheaper, by just  
building a
> >>> big
> >>> fire and throwing the  part in the bed of coals for a while.
> >>>
>  >>> Charlie
> >>>
> >>> -----Original  Message-----
> >>> From: Dave Johnson
> >>>  Sent: Thursday, November 14, 2013 12:31 AM
> >>> To:  at at lists.antique-tractor.com
> >>> Subject: [AT] OT: Rosebuds!  The oxi-acetylene kind....
> >>>
> >>> I'm  pretty ok with cutting & brazing, but have never used a rosebud 
to
>  >>> heat
> >>> something, and my experience today has  me scratching my head.
> >>> The project at hand is freeing up  a cast iron wheel hub, stuck on a
> >>> keyed
>  >>> 1"
> >>> shaft. This is on an old Gilson / MW  garden tractor transmission....
> the
> >>> idea is to  liberate a set of 4 of these hubs to make dual adapters 
for
>  >>> use
> >>> on another tractor with a FEL.
>  >>>
> >>> I have soaked it for quite some time and  have a puller tensioned on 
it,
> >>> but
> >>>  it's not moving.... so now it's time for a little heat.
>  >>>
> >>> I bought a new victor 8-MFA rosebud and lit  it off as I would the
> torch,
> >>> but
>  >>> when I try to get a blue flame, it flames out with a pop!
>  >>>
> >>> What's going on here? Do I not want a hot  blue flame, or do I simply
> >>> need
> >>>  to
> >>> feed a lot more of both gases to the torch? Or??   Any insight into
> these
> >>> things would be  appreciated!
> >>>
> >>>     btw,  I'm on digest, so it'll take a day for me to respond (:<((
>  >>>
> >>>
> >>> Dave in Gilroy,  CA
> >>> webguydave at yahoo.com
> >>>  _______________________________________________
> >>
>  >>
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