Sandeggo, I made the knives all week, but am posting the pics that I saved during that time. Still, it was a lot to do in the time I had!
Jeremy, I keep digital calipers and sometimes a micrometer by the grinder. I hold the blade stock, at least small pieces, on a heavy welding magnet while grinding it on the platen. I keep checking the edges and center of the piece until I'm within .002", then go the rest of the way on granite by hand with paper. As long as you are careful at the grinder, measuring the stock and envisioning what pressure to apply and where when flat grinding, you can get pretty close. A disc is also handy for after the platen, but mine currently needs work.
The spacer was not yet profiled, and had one side hand-flattened on the granite slab. I grabbed a chunk of scrap iron in the milling vise, milled the top of it flat, and lightly sanded it. Thus, the top of the block was roughly trammed to the quill. I then tacked the micarta piece to the top of the iron block with a couple drops of super glue, and having already measured the thickness, I located the surface of the micarta with the end mill, did the math of how many thou to raise the knee, and milled the top off with the knee raised the correct amount to yield actually .192" now that I think about it. Just .002" to dust off on the surface block, or a little more should I get the blade polished and etched and find out that it plus the washers added up to less. In this case, .190" was the finished number. A bit of tapping got the micarta back off the mounting block.
I went back out and took a couple pics of my lock grinding setup, which I made out of scrap and odds and ends. I was asked about it recently and found I had no good pics of it. It gives a 4" hollow ground lock face at 8 degrees.
I used a protractor and scribe to make a 98 degree angle template out of some scrap mild steel.
Then, I used the old tracking wheel from my square wheel grinder for a contact wheel, since it's all steel and I wanted a hard contact wheel with a crisp edge. I use a 400 grit belt, start to finish. The angle plate is put on the tool rest, and adjusted until the relation of wheel to tool rest fits the guide.
With the lock face ground, I scribed the lock location on the liner, then cut out the lock bar.
The hunter blade after etching and a little bit of sanding. My new torch in circle mark for damascus blades, and irregular mark locations. This didn't etch quite at deep as normal, due to a new batch of ferric chloride that I have to tweak a bit.
Again, a lapse in continuity- here's the hunter all glued up and clamped overnight. The scales were scribed to the tang and routed on the mill.
The next morning, I roughed the handle and guard to shape.
All I can say is watch out for that stab maple burl, it can be crumbly inside. I opted for a super glue finish to toughen and seal the surface. I've had good results with Gorilla brand super glue, which penetrates ok and cures quickly.
Over to the grinder, I held the assembled knife without scales or bolsters up to the side of the platen, and flexed the lock bar out by hand, grinding until it engaged when pushed in. It's got a little angle to match the lock face. I ground the lock bar thinner toward the end, for relief of the detent ball when open. Then I bent the lock bar over, making sure to achieve a mild radius rather than a kink.
I drilled the detent ball hole, and then through that into the hardened blade a little past closed to make the detent. Ken Onion was nice enough to give me several #53 and #54 carbide twist drills last time I visited him- I've used other methods for the detent, but this is by far the smoothest in my opinion.
I pressed the ball in. Also, note here that the corner of the lock bar face is ground off a bit toward the spine side, so that only 40-50% engages the blade tang lock face. This is to reduce any feeling of rock that might happen in the open/locked position. I think Bob T. might even have ground off a bit more in his book.
Ready for handle shaping.
Stay tuned! Next time we'll finish them.