Philip Poburka on mon 28 oct 02
Casting...
Find a 'welder' as may know his Trade.
Should one heat the pieces to be
welded ( or Brazed, which may be a better choice here) there
is no reason it may not be done
well.
If you have a kiln, maybe the 'welder' fellow ( or someone
more knowledge-able and in-the-mood) might make a
house-call and you can heat the Castings up to a nice deep
red heat for him to Braze as he may, you can work together
maybe...let 'em cool slow...everyone
did these things back when, no nig deal...a fine and durable
repair may be so made...
Or do such yourself...if you like...as, if you are going to
heat it anyway, you are half way there. Figure out a way to
keep the pieces in their proper place(s) as with sturdy Iron
wire or other...
So...If you did want to do it yourself, you may obtain
Brazing Flux at any Welding Supply Store, and use about any
Brass as is convenient...Brass Screws, Brass Wire, Brass
anything slender and easy to 'feed' works fine...Brass
fileings...whatever.
If it did not come out 'right' no harm has been done, and
you may try again.
Clean the Parts well beforehand...and even boil 'em in some
'draino' or other after a decent solvent cleaning...
Then scrubbing soap-and-water well, to remove Caustic-Draino
residues and scum...
And say an Acid wash ('Muriatic' works well) afer that...
Then lastly, any Acid residue neutralized with a Baking
Soda and Water basteing and clean Water wash...dry with
heat, and keep ready for the Brazeing operation in some dry
place.
Keep hands safe...eyes too...from the 'draino' (Caustic) and
the Acid business...
Keep a little breeze behind you when Brazeing or leaning
over it...or hold yuor breath as you may too...so as not to
be breathing the fumes as have Zinc in them...(Brass beinf
Zink and Copper and all...)
Be fine...
The Old Time Religion...or close enough...
Phil
Las Vegas
----- Original Message -----
From: "vince pitelka"
To:
Sent: Sunday, October 27, 2002 4:05 PM
Subject: Re: Gearbox transfer case for Bluebird 750 SV
> Does anyone have a good transfer case for this model? My
auger jammed and
> broke all the mounts off the gearbox case. Local welder
doesn't think he
can
> weld them back on being it's cast iron. The strainer disk
which is bolted
on
> with 2 allen bolts to the auger broke off and jammed the
blades. Motor
then
> torqued itself off the frame. Anybody has any ideas I'd
love to hear them.
Scott -
What you are looking for is not a transfer case. It is just
a normal
industrial-duty gear-reduction box. Is yours integral with
the motor - what
is normally known as a gearmotor? Or is a separate unit,
with a flexible
coupling or a belt drive from the motor to the gearbox, and
a chain drive
from the gearbox to the auger shaft? Or is it mounted
directly on the auger
shaft? Bluebird has used a lot of different systems over
the years. The
best situation is when it is a separate unit driven by a
flexible coupling
or belt, with a chain drive to the auger shaft, because then
you can adapt
any similar-size gearbox.
Your welder apparently does not have the necessary skills,
but you are
probably still best-off getting the mounting flanges welded
back on the
case. If you have not already done so, what you need to do
is completely
strip down the gearbox case - remove all the gears and
bearings, clean out
the case with paint thinner, and then bolt the case back
together so it
doesn't warp when it is welded. Take it to a good
old-school welder who
really knows about welding cast iron. There is a good
chance he will decide
to braze it, because a properly prepared and executed braze
joint on cast
iron is stronger than one done with cast iron arc welding
rod, which tends
to be very brittle. A good old-school welder will know what
to do.
Purchased new, industrial-duty gear reduction boxes are
EXPENSIVE, so if the
gearbox is okay inside, it will be worth your while to get
the flanges
properly welded back on.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/
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