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Daniel Rohde (D-Vision)
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« on: November 18, 2015, 08:43:21 PM »

Hey guys!

On Chat last night we started talking a bit about torches and some cool modifications you could add to them, well since I don't have a torch this is how I heat just the edge of my blades

And Ed requested a picture: So this is made of a half a soft fire brick with a 1" hole in it(the small chamber allows the little plumbers torch to heat the space very well) the hole is positioned

very close to the top so I have a slot cut into the top which allows the blades edge to slide in and only that gets heated. With practice you can control the hardening line very well. I have

several of these little "forges" with different width of slot cut in the top and different length and I have a couple burners for the longer ones. There is also a little bar to control the depth of

hardening line


here is a video of the hardenigs(VERY boring but shows what I'm doing a little bit) The colors in the video aren't very accurate to what it looks like in person
https://www.youtube.com/watch?v=zhaXi9L8pvU&feature=youtu.be

Here's what they looked like after the first quench( I did two quenchs on all but one that I'm using as a test blade


I would really like to figure out a burner that could run off of a 5 gallon propane tank and and adjustable rest would be nice.

But this has workded very well and I really like it and there's deffinatly room for improvment

What are your thoughts?

DR....    

« Last Edit: November 18, 2015, 08:51:52 PM by Daniel Rohde (D-Vision) » Logged

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TomWhite
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« Reply #1 on: November 18, 2015, 11:00:12 PM »

You have made this to replace a torch, nessicty the mother of invention. Your hardness lines are seemingly perfect. Does this little forge give results from only one direction with the heat? My hat is off to you sir. Certainly, those that are best at what they do will fine a way to do it.  Thank you, I didn't know this was possible. Maybe I won't have to buy a welding rig if I can figure it out.
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Daniel Rohde (D-Vision)
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« Reply #2 on: November 19, 2015, 03:34:52 AM »

Quote
You have made this to replace a torch, necessity the mother of invention. Your hardness lines are seemingly perfect. Does this little forge give results from only one direction with the heat? My hat is off to you sir. Certainly, those that are best at what they do will fine a way to do it.  Thank you, I didn't know this was possible. Maybe I won't have to buy a welding rig if I can figure it out.
Thank you Sir!
Quote
Does this little forge give results from only one direction with the heat?
Yes, This one only has a burner on one side. I have tried one from both sides but with such a small chamber it didn't work well( in this small one anyway). I haven't seen any ill effects of it though. I have two burners on the lower edge heating forge that I use for kitchen knives and hopfull it's good enough to do a 1/4" bowie I'm working on...we'll see
Quote
I didn't know this was possible. Maybe I won't have to buy a welding rig if I can figure it out.
Me either but I gave it a go and it worked! I would have gotten a A/O torch like Ed but I can't afford a 1k Setup and the acetylene is expensive so that's out for now. It's really not that hard to use, the burner head I'm using is really nice for this and the little bottles will do probably 20 knives before they need changing(there about $3 each).

I want to add that I harden all blades that are up to 1/8" thick at full thickness, I don't grind a bevel on them, I feel you might get some over heating on the thinner blade stock if your pre ground them. 5/32" and up had been fine with pre ground bevels(just leave som thickness in the edge)

Hope it will help someone,
DR...
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Ed Fowler
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« Reply #3 on: November 19, 2015, 03:04:02 PM »

That looks like a great way to achieve differential hardening. Very precise and repeatable, the propane tip should provide a soft flame and that is what is needed.

When you etch the blades do you see any difference from one side to the other?

I thank you for sharing it with us, you are doing very well.

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Daniel Rohde (D-Vision)
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« Reply #4 on: November 19, 2015, 05:29:07 PM »

Quote
That looks like a great way to achieve differential hardening. Very precise and repeatable, the propane tip should provide a soft flame and that is what is needed.

When you etch the blades do you see any difference from one side to the other?

I thank you for sharing it with us, you are doing very well.
Thanks Ed!
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When you etch the blades do you see any difference from one side to the other?
no I haven't, but that is one reason I etch just about all my blades, that, and I really like the look of a hardening line

I just finished hardening a big bowie that is 1/4" thick and it worked very well, better than I was anticipating.
« Last Edit: November 19, 2015, 05:32:03 PM by Daniel Rohde (D-Vision) » Logged

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Daniel Rohde (D-Vision)
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« Reply #5 on: November 19, 2015, 08:35:02 PM »

Here at two that I'm finishing up: Nice clean hardening lines
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TomWhite
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« Reply #6 on: November 20, 2015, 12:08:04 AM »

Thanks again,  you have inspired me to beat some steel, it looks well, I just need to harden it. Sorry, I haven't figured out how to post pictures. 3.5 inch regular Ed knife. Wish me luck. This was the easy part so far. Will continue as time allows.
Sometimes  these projects go on for months. Making knives is always an inspiration for me and thanks for sharing.
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Daniel Rohde (D-Vision)
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« Reply #7 on: November 20, 2015, 02:21:10 AM »

Quote
Thanks again,  you have inspired me to beat some steel, it looks well, I just need to harden it. Sorry, I haven't figured out how to post pictures. 3.5 inch regular Ed knife. Wish me luck. This was the easy part so far. Will continue as time allows.
Sometimes  these projects go on for months. Making knives is always an inspiration for me and thanks for sharing.
Your very welcome! I'd love to see your blade if you can figure out how(if you need any any help just let me know!)  I have a forged blade I'm working on myself I don't do many but it's turning out very well! I'm starting to build a forge and anvil for my home shop so I'm pretty excited.
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« Reply #8 on: November 21, 2015, 10:54:23 PM »

I still have to sand down and get my hardening thickness right.  The steel still seems slightly hard, maybe not a perfect anneal, I don't know. Good steel is usually pretty tough anyways. I will be attempting the modified Price grind Ed uses. I like its aggressive cut on a pull stroke and the strength it provides to the point of the blade.
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« Reply #9 on: November 25, 2015, 04:56:00 AM »

very nice setup Daniel!!

one thing I noticed in the video is that it really seems to heat the blades up pretty fast. have you tried lowering the temp and see if that makes a difference in the amount of time it takes to heat fro the quench as far as performance?
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Daniel Rohde (D-Vision)
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« Reply #10 on: November 25, 2015, 01:44:54 PM »

Quote
very nice setup Daniel!!

one thing I noticed in the video is that it really seems to heat the blades up pretty fast. have you tried lowering the temp and see if that makes a difference in the amount of time it takes to heat fro the quench as far as performance?
Thanks Joe!

No, I haven't toyed with it a whole lot, though it doesn't seem to work out as well if I turn it down. Those where 1/16" thick so they heat up alot faster than 3/32"
 
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John Silveira
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« Reply #11 on: November 29, 2015, 03:17:11 AM »

PS.
Like your makers marks
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Daniel Rohde (D-Vision)
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« Reply #12 on: November 29, 2015, 06:24:56 PM »

Thanks John!
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Daniel Rohde (D-Vision)
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« Reply #13 on: December 02, 2015, 09:11:18 PM »

Here's another one
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John Silveira
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« Reply #14 on: December 03, 2015, 07:53:52 AM »

Yup - that's cool
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