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Thanks BC.
Another FF. I think I've got it now.
Another FF. I think I've got it now.
That's not a Knife
- Thread starter 7.62marksman
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Help Support Prospecting Australia:
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Just finished. Friction folder evolution. My own design, using the same angles in my makers stamp, translated to all parts of the knife. This one is a prototype. There are a couple of angles I am going to change ever so slightly to the order of perfection, plus I am going to taper the thickness of the thumb lever for a perfect fit. That being said, I love this knife and I am seriously thinking of keeping it instead of selling it.
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Patrick1 said:
What does that look like mate? Photos?
Baz
this i think
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While showing a quick video of how my latest knife works, I thought I'd have a quick play around with a free video editor and chuck in the intro clip. I need to learn all the tricks of a full version video editor, but that's a way off yet.
Whaddya reckon?
Baz.
[video=480,360]https://youtu.be/qTcEreEX5gA[/video]
Whaddya reckon?
Baz.
[video=480,360]https://youtu.be/qTcEreEX5gA[/video]
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There's a few things about my new design that I'm not quite satisfied with. So, I've broken it apart to make changes, as well as use it to make a template for more. I'm pretty excited about this one. When you hold it in your hand or slip it in your pocket, you just know it's going to become a well used tool.
shakergt
Moderating Team
Look what you guys have gone and done. Got me knife making now. I have wanted to give it a go for ages. This is my second attempts the first one I stuffed up. Anyway this started life as an old edger blade. It has been heated and quenched twice. I want to get the edge a bit better before the final heat and oil quench. As I don't have a polisher what do you guys recomend for the finish off. Any advice will be greatly appreciated.
Get a pack of wet and dry sheets from the internet, Ebay maybe.
Go from 120 to 3000 grit, and use it to polish the blade steel and you can even use it to form the edge and sharpen it.
Lots of YouTube vids on that.
Get a cheap Bench grinder and a buffing pad with compound too, an angle grinder can do in a pinch.
We all have to start some where.
I am collecting solid chainsaw bars and concrete cutting blades at this time.
Go from 120 to 3000 grit, and use it to polish the blade steel and you can even use it to form the edge and sharpen it.
Lots of YouTube vids on that.
Get a cheap Bench grinder and a buffing pad with compound too, an angle grinder can do in a pinch.
We all have to start some where.
I am collecting solid chainsaw bars and concrete cutting blades at this time.
Ship of fools
Mat. T
Sandbagger said:
Very Dramatic!
Matt T
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shakergt said:
Here's a few tips for you mate.
Edger blade - unknown qualities, plus it is likely to have hit rock and concrete very hard multiple times, so is likely to have fractures in it.
Heat treating - you need to leave the cutting edge about 1mm thick to survive the heat treating process without buckling, bending and cracking.
The 1mm edge should have the grind lines going length ways down the blade, while the sides of the knife should have them going across the knife. This stops stress risers and a potential crack from forming and continuing all the way over.
1075 is a high carbon steel, which is readily available through Gameco Artisan Supplies. It is cheap and the industry standard. 40 bucks should get you a bar of about a metre to make some reasonable knives out of.
You can also get Rynowet sandpaper from Gameco, which lasts three times longer than that Bunnings crap.
Getting your steel too hot in the heat treat before quenching in warm canola oil, can be just as bad as not getting it hot enough. You only need to bring it up to the non-magnetic, critical temperature and no further. For 1075, that is 815 degrees. Watch you don't get the tip and the edge too hot. Put it in and out of the heat, watching the thin material, and let the thicker parts of the blade creep up to temperature slowly. When you quench, get it straight out of the heat and straight in the oil. Milliseconds count. Gently wave the knife in the oil, like you are slicing it, to break up the steam-jacket that may slow the rate of cooling. Side to side is a big no-no, as you may cool one side of the blade faster than the other and get a bend.
Stick it in the oven for two hours at 210 degrees Celcius for tempering. Any clean parts of the blade should come out a golden, straw yellow. If it turned blue, you've got too hot and you need to go all the way back to heat-treating again.
After heat treat, then you can do the post-heat treat grind to refine your geometries and bring the bevel and edge down to zero, ready for sharpening. All the while you are doing this finishing grind you must constantly dunk it in water every grind, so you don't cook the blade. If you turn any part of the blade blue, you need to go back to heat treat, but if the edge is now zero, you need to grind it off to 1mm again or it will split warp and buckle in the HT.
If you finish your grind to 100 grit or better, then you can clamp your blade to a block of wood, wrap some rynowet at 120 grit around a piece of aluminium bar stock and sand length-ways to get the scratches out. It's hard work and every knifemaker hates it, but it's the last 5% that makes 80% of the difference. Progress up through the grits, finishing on at least 320 grit, but you can go higher for a mirror finish if you want.
I hope this helps.
Baz.
shakergt
Moderating Team
Take 3. The first two did not work out. I guess that's what I get from not using steel that I dont know what it is. This time around I purchased some proper knife steel and so far I am happy with it.
I was surprised how quickly the blade got sharp just from sanding to get the satin look. Yes I got bit now I use gloves when i get to the sanding stage.
shakergt
Moderating Team
Take 3. The first two did not work out. I guess that's what I get from not using steel that I dont know what it is. This time around I purchased some proper knife steel and so far I am happy with it.
I was surprised how quickly the blade got sharp just from sanding to get the satin look. Yes I got bit now I use gloves when i get to the sanding stage.
shakergt
Moderating Team
Tempering done. Now for the final sand and polish. Then the handle.
shakergt
Moderating Team
Sandbagger said:
Thank you the info Baz. I have gone with steel and info from Gameco. My blade went peacock purple. Is that bad? This knife will be used as a skinner.
shakergt
Moderating Team
Getting there
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shakergt said:
What kind of steel is it?
Did you harden it first, before tempering? How?
How long and at what temp did you temper it at?
Baz.
