Okay so today, we're going to show roughly how I make a knife from blank steel, up to
the finished product.
Okay, so now we're, obviously we've ground the blank. We're going to do the heat treatment
now so, this is my heat treat oven. I'm going to preheat this up to 500 degrees before I
put my blank in. It's just a matter of flicking this on. So I'll pop that on, now that will
preheat up to 500 degrees where it's ready for the blank.
Alright so, the oven's up to temperature now. 500 degrees. So we're going to pop the blank
in and get it up to 800 degrees for the heat treat. So it's just a matter opening the oven
up and popping the blank into there. Popping the blank in. Close the door. We're just going
to turn this up to 800 degrees and then once it's got to temperature we'll pull out the
steel to soak. There we go.
Alright so the knife's now been in there having a good soak at 800 degrees and we're now going
to quench it in the oil and that will be the heat treat all complete.
Alright so we transfer it from here straight into the oil, quick as possible.
Just hold it in there for awhile just to let the steel cool down.
And there we go. That's the blade heat treated. That's the blade quenched in the oil, so I
actually use old engine oil just obviously it's easy to come by and it cools the steel
down really quickly. You can use like a brine solution but it can get quite a bit of spit
back from that which obviously, coming at high temperatures, can be quite dangerous.
Engine oil has also got its downsides. It can flare up and stuff like that, but it's
just a matter of being careful and taking precautions. So now that this is quenched
we are actually going to temper it slightly, take some of the hardness out of it and just
make it less brittle and then it will be on to the handling after that.
Right. Now I'm going to temper the steel, basically just to soften off the stress points
on the knife. So, across here. Obviously you've got a tube that's going to go through there
and thin the steel. Going to de-stress it there along the spine of the blade. Heat it
with a blow torch then dunk it straight into the water and that will cool it down. So,
we just heat that up with a blow torch.
As it comes up to temperature you'll actually start to see a colour change in the steel.
And on there now you can actually see, it's going up into the spine of the blade slightly.
That's it. So now, that is ready now to put a handle on.
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