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Thread: Is there a 'best' way?
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8th Nov 2019, 07:37 PM #16
Hi Michael,
I didn't realise that you called it a resistance welder ! Because the machine that he used had a pair of cables that went down to a transformer sat on the floor. He used a foot switch to operate it.
I didn't see anything that I would call complex about it. Two cams clamping the blade to a pair of copper blocks and another cam pressing them together, all on a 8 X 6 piece of Tufnol or Paxolin board.
I would have thought that it would be very easy to copy.
Butt Welder.png
Just three cams, two clamping the blade and one pressing the ends together. The brown is the Paxolin insulator and the blue is the support. The two power cables from the transformer are shown by the orange dots in the copper blocks. Only one side actually moved to force the blade ends together. The gap between the copper blocks was about 1/2" to 3/4" of an inch.
The grinding jig, if you can call it that was just a curved steel section of a circle, probably of about two foot diameter and about the same length, about 50 mm wide, 1/8" flat bar. After welding and annealing, he just put the blade over it and held it down with his foot, ground it, flipped it over and did the other side.
If I ever break a blade I would be very tempted to build a device like this, and I've got an old welding transformer to do it with !
Oh I can feel another project coming on......Last edited by BaronJ; 9th Nov 2019 at 02:23 AM. Reason: Added Picture and information.
Best Regards:
Baron J.
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8th Nov 2019, 08:17 PM #17Most Valued Member
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The ancient Thiel bandsaw I picked up a while back has a separate blade welder mounted to the side. No grinder though.
As Baron says, it looks pretty simple. It's all contained on and in a metal box maybe 200x125x125 from memory.
It's currently sitting in the back of the workshop at work until I sort out space/time for it at home.
Happy to look more closely at it and grab some photos etc if you are interested in it's construction.
Steve
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8th Nov 2019, 09:45 PM #18Most Valued Member
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Found this simple looking device for grinding the weldment. For someone as skilled as you, it's a easy peazy job.
https://www.youtube.com/watch?v=X8PcY7Fz7qk
KrynTo grow old is mandatory, growing up is optional.
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8th Nov 2019, 09:55 PM #19Philomath in training
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I haven't seen that but yes, that was the plan - something like the device featured (see option 2...)
I would hope that anything I made would have a smoother feed action than that though.
Those resistance welders are not all that complex, but I can do the welding bit. For me, the pain is the grinding. Even if I made up a resistance welder, I'd still have to grind it.
Michael
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8th Nov 2019, 10:11 PM #20Most Valued Member
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If you were to use a couple of the runners that you sold off, they would give you a smooth action, or make up a system like BJ did for his Tool and Cutter grinder using bearings, (all the same size though). Sorry BJ couldn't resist that one.
KrynTo grow old is mandatory, growing up is optional.
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9th Nov 2019, 01:02 AM #21
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9th Nov 2019, 01:04 AM #22
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9th Nov 2019, 10:08 AM #23Most Valued Member
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Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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10th Nov 2019, 08:46 PM #24Most Valued Member
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Found this on Google, a bandsaw blade welder in PDF format.
file:///C:/Users/Kryn%20Buitendyk/Do...e%20Welder.pdf
NoTo grow old is mandatory, growing up is optional.
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10th Nov 2019, 09:02 PM #25Philomath in training
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10th Nov 2019, 09:15 PM #26Diamond Member
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That link doesn't work because he linked it to a file on his computer.
Here are some instructions for a bandsaw blade welder, not sure if it is similar to Kryns or not.
http://pdfstream.manualsonline.com/b...1378d5a62f.pdf
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10th Nov 2019, 09:17 PM #27
Hi Michael,
Grinding Stand.png
This is the sort of thing he used to grind the flash off the weld. Its about four feet tall and the part circle is about two feet across.
It was just a long piece of angle Iron screwed to a wooden bench leg with the flat bit supporting the ends of the round bit level with the bench top.Best Regards:
Baron J.
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10th Nov 2019, 09:19 PM #28Diamond Member
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This one has a grinder built in.
https://www.dakecorp.com/uploads/pdf...ated-front.pdf
Here is a Video.
https://www.youtube.com/watch?v=48ibSP-K2Pk
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12th Nov 2019, 02:38 PM #29Member
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I MIG mine back together then use a cutoff wheel to gently dress the weld. It is easier with a cutoff wheel to avoid undercutting the band than it is with a grinding wheel. Technically not meant to axially load a cut off wheel but if your gentle...