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Michael -
The ring gear is a pretty simple device with a very low loading and very
little use... with several hundred teeth and only a half second of use,
typically, the chance the ring gear failing due to improper heat treatment
is very low.
The synchro rings, however, are very different. Not only are they
subjected to constant and repeated stress, the brass itself is a soft metal
that is put in the position of having to function through significant
amounts of friction. In this regard heat treatment is critical.
Cheers,
Alan
On Wed, Jan 21, 2015 at 1:01 AM, Michael Salter <michaelsalter@gmail.com>
wrote:
> I have found the comments on this topic to be very interesting with
> regards to the heating of the ring gear. I am no metallurgist so I tend to
> pay attention to manufacturers instructions regarding the heating of metal
> components very carefully.
> In the BN1 workshop manual instructions are given for shrink fitting new
> brass syncro cones onto the gears. The instructions read:
> *"The heating (of the syncro ring) can best be done by immersion in oil of
> 250 degrees Fahrenheit and then fitting by means of a hand press. After
> shrinking on, the unit should be immediately be quenched in water to
> prevent the heat softening the gear itself.*
> 250 degrees Fahrenheit is the equivalent of 121 degrees Centigrade.
> Well, if we are going to be heating the actual RING GEAR to 2 or 300
> degrees Centigrade should we not perhaps be a tad concerned about heat
> softening the ring gear??
> Just a thought....
>
> Michael S
> BN1 #174
>
>
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<div dir=3D"ltr">Michael -<div><br></div><div>The ring gear is a pretty sim=
ple device with a very low loading and very little use... with several hund=
red teeth and only a half second of use, typically, the chance the ring gea=
r failing due to improper heat treatment is very low.</div><div><br></div><=
div>The synchro rings, however, are very different.=C2=A0 Not only are they=
subjected to constant and repeated stress, the brass itself is a soft meta=
l that is put in the position of having to function through significant amo=
unts of friction.=C2=A0 In this regard heat treatment is critical.</div><di=
v><br></div><div>Cheers,</div><div><br></div><div>Alan</div><div class=3D"g=
mail_extra"><br><div class=3D"gmail_quote">On Wed, Jan 21, 2015 at 1:01 AM,=
Michael Salter <span dir=3D"ltr"><<a href=3D"mailto:michaelsalter@gmail=
.com" target=3D"_blank">michaelsalter@gmail.com</a>></span> wrote:<br><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex"><div dir=3D"ltr"><div style=3D"font-family:com=
ic sans ms,sans-serif;font-size:small">I have found the comments on this to=
pic to be very interesting with regards to the heating of the ring gear. I =
am no metallurgist so I tend to pay attention to manufacturers instructions=
regarding the heating of metal components very carefully.<br></div><div st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:small">In the BN1 wor=
kshop manual instructions are given for shrink fitting new brass syncro con=
es onto the gears. The instructions read: <br><i>"The heating (of the =
syncro ring) can best be done by immersion in oil of 250 degrees Fahrenheit=
and then fitting by means of a hand press. After shrinking on, the unit sh=
ould be immediately be quenched in water to prevent the heat softening the =
gear itself.</i><br></div><div style=3D"font-family:comic sans ms,sans-seri=
f;font-size:small">250 degrees Fahrenheit is the equivalent of 121 degrees =
Centigrade. <br>Well, if we are going to be heating the actual RING GEAR to=
2 or 300 degrees Centigrade should we not perhaps be a tad concerned about=
heat softening the ring gear??<br></div><div style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Just a thought....<br></div><div style=3D=
"font-family:comic sans ms,sans-serif;font-size:small"><br></div><div style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">Michael S<br></di=
v><div style=3D"font-family:comic sans ms,sans-serif;font-size:small">BN1 #=
174<br></div></div><div class=3D"gmail_extra"><br></div></blockquote></div>=
</div></div>
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