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Posted by steamer on February 5, 2008, 11:26 am
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--Well I bit the bullet and made an alignment jig but I'm not sure
I've got all the fiddly bits set up right. Has anyone got photos of one
they've made up somewhere?
What prompted the build: a pal came by with a blade that was broken;
I ground the ends and butted them together on a corner of the welding table
(awkward), then whipped out the tig torch and voila! Poof! No blade! So I
needed a nice brazing jig. I guess grinding at an angle is not recommended
either, yes?
--
"Steamboat Ed" Haas : The impeachment process
Hacking the Trailing Edge! : exists for a reason...
www.nmpproducts.com
---Decks a-wash in a sea of words---
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Posted by spaco on February 5, 2008, 11:44 am
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I'd say that grinding at an angle is recommended. I think it's called a
"scarf". Your alignment jig needs only to hold the two ends together
"out in space" so the heat won't sink away too fast. I use a silver
solder that melts at about 1200° F.
I align the ends, overlapping at the scarf by, maybe 1/4" and sprung
slightly so the ends lie firmly together. I cut about 1/4" of silver
solder off the roll and smash it flat, so it's about 1/32" thick. Do
this on a clean plate so you don't add any crud to the solder. Add some
brazing flux between the ends (too much is better than too little), and
poke the piece of solder in between the ends. Heat gently with a
torch. Unless your blades are much wider than 1/2", a propane torch
will do. Just as color comes (in a dimly lit area), solder melts and
is squeezed as joint pulls together, back torch off and let cool.
Pete Stanaitis
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steamer wrote:
> --Well I bit the bullet and made an alignment jig but I'm not sure
> I've got all the fiddly bits set up right. Has anyone got photos of one
> they've made up somewhere?
> What prompted the build: a pal came by with a blade that was broken;
> I ground the ends and butted them together on a corner of the welding table
> (awkward), then whipped out the tig torch and voila! Poof! No blade! So I
> needed a nice brazing jig. I guess grinding at an angle is not recommended
> either, yes?
>
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Posted by Pete C. on February 5, 2008, 12:08 pm
Please log in for more thread options steamer wrote:
>
> --Well I bit the bullet and made an alignment jig but I'm not sure
> I've got all the fiddly bits set up right. Has anyone got photos of one
> they've made up somewhere?
> What prompted the build: a pal came by with a blade that was broken;
> I ground the ends and butted them together on a corner of the welding table
> (awkward), then whipped out the tig torch and voila! Poof! No blade! So I
> needed a nice brazing jig. I guess grinding at an angle is not recommended
> either, yes?
>
> --
> "Steamboat Ed" Haas : The impeachment process
> Hacking the Trailing Edge! : exists for a reason...
> www.nmpproducts.com
> ---Decks a-wash in a sea of words---
I believe Ernie had posted a detailed TIG brazing procedure for bandsaw
blades some time ago. You might try searching for it. If I run across it
I'll repost it.
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Posted by Ed Huntress on February 5, 2008, 12:51 pm
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> steamer wrote:
>>
>> --Well I bit the bullet and made an alignment jig but I'm not
>> sure
>> I've got all the fiddly bits set up right. Has anyone got photos of one
>> they've made up somewhere?
>> What prompted the build: a pal came by with a blade that was
>> broken;
>> I ground the ends and butted them together on a corner of the welding
>> table
>> (awkward), then whipped out the tig torch and voila! Poof! No blade! So I
>> needed a nice brazing jig. I guess grinding at an angle is not
>> recommended
>> either, yes?
Grinding at an angle is the way to go if you're going to silver-braze the
blades, which is the traditional method. I've been using it for over 30
years and I much prefer it to home-welded blades. The brazed joint is much
stronger than the parent metal and the finished joint is smooth.
However, I don't doubt that someone who's really good at TIG can do a fine
job. It's just that it isn't necessary.
--
Ed Huntress
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Posted by Pete C. on February 5, 2008, 2:35 pm
Please log in for more thread options Ed Huntress wrote:
>
> > steamer wrote:
> >>
> >> --Well I bit the bullet and made an alignment jig but I'm not
> >> sure
> >> I've got all the fiddly bits set up right. Has anyone got photos of one
> >> they've made up somewhere?
> >> What prompted the build: a pal came by with a blade that was
> >> broken;
> >> I ground the ends and butted them together on a corner of the welding
> >> table
> >> (awkward), then whipped out the tig torch and voila! Poof! No blade! So I
> >> needed a nice brazing jig. I guess grinding at an angle is not
> >> recommended
> >> either, yes?
>
> Grinding at an angle is the way to go if you're going to silver-braze the
> blades, which is the traditional method. I've been using it for over 30
> years and I much prefer it to home-welded blades. The brazed joint is much
> stronger than the parent metal and the finished joint is smooth.
>
> However, I don't doubt that someone who's really good at TIG can do a fine
> job. It's just that it isn't necessary.
The technique was TIG brazing, not welding.
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> I've got all the fiddly bits set up right. Has anyone got photos of one
> they've made up somewhere?
> What prompted the build: a pal came by with a blade that was broken;
> I ground the ends and butted them together on a corner of the welding table
> (awkward), then whipped out the tig torch and voila! Poof! No blade! So I
> needed a nice brazing jig. I guess grinding at an angle is not recommended
> either, yes?
>