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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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Help soldering broken bandsaw blade
"Artemus" wrote:
Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller |
#2
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Help soldering broken bandsaw blade
Wes wrote:
"Artemus" wrote: Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller Ill come in here, Ive silver brazed my band saw lades for 40 yrs. as linked, the scarf joint needs to be minimum 3/8ths in long, you do this scarfing on the top wheel of a band sander set up vertically. Jig as also described, but bend the lower blade end up a little and he top blade down a little. You need to use a 50% if you can get it silver solder in foil form, 5 to 10/1000 in thick. cut a piece exactly to size, place between the 2 blade ends. mx up some easyflo flux paste preferrably s/steel grade, apply arround the joint area. heat gently till the flux goes clear, continue to heat till the joint goes a dull red under the flux and the silver solder flows to wet the scarf area. allow to cool clowly. Remove from jig, fftle up and grind both sides of blade so that the thickness is the same overall, as you said .025 thick. dont over tension the saw blade. Hope this helps. Ted. Dorset UK. |
#3
Posted to rec.crafts.metalworking
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Help soldering broken bandsaw blade
Ted Frater wrote:
Wes wrote: "Artemus" wrote: Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller Ill come in here, Ive silver brazed my band saw lades for 40 yrs. as linked, the scarf joint needs to be minimum 3/8ths in long, you do this scarfing on the top wheel of a band sander set up vertically. Jig as also described, but bend the lower blade end up a little and he top blade down a little. You need to use a 50% if you can get it silver solder in foil form, 5 to 10/1000 in thick. cut a piece exactly to size, place between the 2 blade ends. mx up some easyflo flux paste preferrably s/steel grade, apply arround the joint area. heat gently till the flux goes clear, continue to heat till the joint goes a dull red under the flux and the silver solder flows to wet the scarf area. allow to cool clowly. Remove from jig, fftle up and grind both sides of blade so that the thickness is the same overall, as you said .025 thick. dont over tension the saw blade. Hope this helps. Ted. Dorset UK. If you don't have foil, a clean hammer face and anvil surface can make some foil for you with a blow or two. Wes |
#4
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Help soldering broken bandsaw blade
"Ted Frater" wrote in message ... Wes wrote: "Artemus" wrote: Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller Ill come in here, Ive silver brazed my band saw lades for 40 yrs. as linked, the scarf joint needs to be minimum 3/8ths in long, you do this scarfing on the top wheel of a band sander set up vertically. Jig as also described, but bend the lower blade end up a little and he top blade down a little. You need to use a 50% if you can get it silver solder in foil form, 5 to 10/1000 in thick. cut a piece exactly to size, place between the 2 blade ends. mx up some easyflo flux paste preferrably s/steel grade, apply arround the joint area. heat gently till the flux goes clear, continue to heat till the joint goes a dull red under the flux and the silver solder flows to wet the scarf area. allow to cool clowly. Remove from jig, fftle up and grind both sides of blade so that the thickness is the same overall, as you said .025 thick. dont over tension the saw blade. Hope this helps. Ted. Dorset UK. That's kind of what I was thinking to make the scarfs. Thanks. I don't have an OE torch. Can I use propane with the 50% silver solder? Mapp? Mapp/oxy? Art |
#5
Posted to rec.crafts.metalworking
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Help soldering broken bandsaw blade
Artemus wrote:
"Ted Frater" wrote in message ... Wes wrote: "Artemus" wrote: Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller Ill come in here, Ive silver brazed my band saw lades for 40 yrs. as linked, the scarf joint needs to be minimum 3/8ths in long, you do this scarfing on the top wheel of a band sander set up vertically. Jig as also described, but bend the lower blade end up a little and he top blade down a little. You need to use a 50% if you can get it silver solder in foil form, 5 to 10/1000 in thick. cut a piece exactly to size, place between the 2 blade ends. mx up some easyflo flux paste preferrably s/steel grade, apply arround the joint area. heat gently till the flux goes clear, continue to heat till the joint goes a dull red under the flux and the silver solder flows to wet the scarf area. allow to cool clowly. Remove from jig, fftle up and grind both sides of blade so that the thickness is the same overall, as you said .025 thick. dont over tension the saw blade. Hope this helps. Ted. Dorset UK. That's kind of what I was thinking to make the scarfs. Thanks. I don't have an OE torch. Can I use propane with the 50% silver solder? Mapp? Mapp/oxy? Art For a piece that small your propane torch should work . Dad silversoldered that way - though not bandsaw blades . Bigger pieces he put on mom's gas range plus the torch . -- Snag "90 FLHTCU "Strider" '39 WLDD "PopCycle" BS 132/SENS/DOF |
#6
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Help soldering broken bandsaw blade
On Fri, 11 Jun 2010 03:59:19 +0100, Ted Frater
wrote: Wes wrote: "Artemus" wrote: Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller Ill come in here, Ive silver brazed my band saw lades for 40 yrs. as linked, the scarf joint needs to be minimum 3/8ths in long, you do this scarfing on the top wheel of a band sander set up vertically. Jig as also described, but bend the lower blade end up a little and he top blade down a little. You need to use a 50% if you can get it silver solder in foil form, 5 to 10/1000 in thick. cut a piece exactly to size, place between the 2 blade ends. mx up some easyflo flux paste preferrably s/steel grade, apply arround the joint area. heat gently till the flux goes clear, continue to heat till the joint goes a dull red under the flux and the silver solder flows to wet the scarf area. allow to cool clowly. Remove from jig, fftle up and grind both sides of blade so that the thickness is the same overall, as you said .025 thick. dont over tension the saw blade. Hope this helps. Ted. Dorset UK. Here's a source of 56% silver solder in foil form: http://www.brownells.com/.aspx/pid=5..._SILVER_SOLDER This alloy flows freely at 1205F (652C), which is a dull red. If your propane torch will get your workpiece to red heat, it is sufficient. It's easy to overheat when silver brazing. Patience is a good thing. Get some "black flux" at a welding store. Other silver-brazing fluxes will work, but black flux tolerates overheating which most beginners do because they get impatient. |
#7
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Help soldering broken bandsaw blade
On Thu, 10 Jun 2010 23:03:07 -0500, "Snag"
wrote: Artemus wrote: That's kind of what I was thinking to make the scarfs. Thanks. I don't have an OE torch. Can I use propane with the 50% silver solder? Mapp? Mapp/oxy? Art For a piece that small your propane torch should work . Dad silversoldered that way - though not bandsaw blades . Bigger pieces he put on mom's gas range plus the torch . I have been using a propane "Turbo Torch" for silver brazing for many years. I think that the largest Item I ever did was a 4" brass drain elbow joined to a toilet floor flange - I had to cut both pieces to reduce the cover (concrete floor) over the top of the pipe to less than an inch. The home owner had attempted to instal the toilet on top of the stub left by the original construction contractor then brought home another bag of "sack crete" every night to raise the floor up to support the toilet - WHAT A F * * * *D UP MESS ! Gerry :-)} London, Canada |
#8
Posted to rec.crafts.metalworking
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Help soldering broken bandsaw blade
On Fri, 11 Jun 2010 03:59:19 +0100, Ted Frater
wrote: Wes wrote: "Artemus" wrote: Obviously I'm doing something wrong here as my joints are brittle and don't hold worth squat. I ground the ends of the blade to about 45 degrees and cleaned the ends with sandpaper. I put on plenty of flux and wedged a small piece of silver solder in the scarf joint. Silver solder (low silver content) or silver braze (high silver content)? Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller Ill come in here, Ive silver brazed my band saw lades for 40 yrs. as linked, the scarf joint needs to be minimum 3/8ths in long, you do this scarfing on the top wheel of a band sander set up vertically. Jig as also described, but bend the lower blade end up a little and he top blade down a little. You need to use a 50% if you can get it silver solder in foil form, 5 to 10/1000 in thick. cut a piece exactly to size, place between the 2 blade ends. mx up some easyflo flux paste preferrably s/steel grade, apply arround the joint area. heat gently till the flux goes clear, continue to heat till the joint goes a dull red under the flux and the silver solder flows to wet the scarf area. allow to cool clowly. Remove from jig, fftle up and grind both sides of blade so that the thickness is the same overall, as you said .025 thick. dont over tension the saw blade. Hope this helps. Ted. Dorset UK. I've also silver brazed my blades for many years but slightly differently. The 30 deg bevelled blades are held in a simple open jig with small G clamps. An 0.005" feeler gauge (subsequently withdrawn) spaces the two ends to provide a proper capillary gap. The gap is covered with a thick wodge of flux. A very short snippet of silver solder wire is embedded within this flux - only enough solder volume to slightly overfill the 0.005" nominal gap With the blade horizontal (flux + solder on top) the UNDERSIDE is heated with a propane or MAPP gas torch. This gives complete visual control of the heating process without danger of under or overheating. As the temperature rises the flux, while still covering the solder, melts and becomes transparent. You can then observe the exact moment when the solder melts and flashes into the joint. This consistently produces clean reliable joints which require little or no dressing after brazing. Jim |
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