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

[Stephen Offiler]

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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