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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Fixing broken bandsaw blades
--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--- |
#2
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
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 ----------------------- 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? |
#3
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
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. |
#4
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
"Pete C." wrote in message ... 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 |
#5
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
Ed Huntress wrote:
"Pete C." wrote in message ... 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. |
#6
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
Pete C. wrote:
Ed Huntress wrote: "Pete C." wrote in message ... 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. I'm not sure about that. I think Ernie welds them. See http://tinyurl.com/22cx2p Grant -- Posted via a free Usenet account from http://www.teranews.com |
#7
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
A friend of mine found out I had a blade welder and asked me to make some
specials for him from his stock. I told him I didn't have much experience at blade welding, but I would give it a go. I took one of my old ones and made the joint crooked intensionally, and then welded it so that you couldn't uncoil the blade. When I handed it to him, he made a face, but was trying to be polite. I told him that little bump wouldn't be too noticeable. :-) Great fun. "steamer" wrote in message ... --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--- |
#8
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
Grant Erwin wrote:
I'm not sure about that. I think Ernie welds them. See http://tinyurl.com/22cx2p I've certainly TIGged them sucessfully. 0.040" tungsten and small (0.030" ?) SS MIG wire seems to work. Pete -- Pete Snell Department of Physics Royal Military College --------------------------------------------------------------------- We dance round in a ring and suppose, But the Secret sits in the middle and knows. Robert Frost (1874-1963) |
#9
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
Grant Erwin wrote:
Pete C. wrote: Ed Huntress wrote: "Pete C." wrote in message ... 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. I'm not sure about that. I think Ernie welds them. See http://tinyurl.com/22cx2p Grant -- Posted via a free Usenet account from http://www.teranews.com Dunno, that doesn't seem to be the thread I recall. Perhaps I'm confusing a TIG brazing and a TIG blade welding thread. |
#10
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
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? Ernie was recommending welding the blades with ER80-S-B2. My (limited) experience has been to get as small a filler rod as you can find. I got some 0.045 and would like it thinner. Here are a couple of pictures of a jig that I made a few years ago: http://www.metalworking.com/dropbox/...jig_readme.txt http://www.metalworking.com/dropbox/bsaw_blade_jig1.jpg http://www.metalworking.com/dropbox/bsaw_blade_jig2.jpg Bob |
#11
Posted to rec.crafts.metalworking
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Fixing broken bandsaw blades
On 05 Feb 2008 16:26:19 GMT, 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? I made mine out of a 18" length of scrap 3" channel with two 6" lengths of 1& 1/2" L bolted to the web, 1/4" above the flange with a couple cap screws to act as clamping screws. Then I cut a 1" gap in the flange midway between the clamping pieces to act as a working area for the propane torch. Gerry :-)} London, Canada |
#12
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Fixing broken bandsaw blades
On Tue, 5 Feb 2008 12:51:24 -0500, "Ed Huntress"
wrote: "Pete C." wrote in message ... 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. To do the scarf, I put the two ends together, apply vice grip and hit the bench grinder to give about a 30 deg. bevel. Doing both ends together will ensure that the bevel is close to the same on both ends. Don't worry about matching teeth. Gerry :-)} London, Canada |
#13
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Fixing broken bandsaw blades
--Very neat; very simple. Thanks for the photos! Mine's a little
more complex; will post photos tomorrow. -- "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--- |
#14
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Fixing broken bandsaw blades
steamer wrote:
--Very neat; very simple. Thanks for the photos! Mine's a little more complex; will post photos tomorrow. Thanks, I'll take a look. Bob |
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