Monday, February 3, 2014

Navy K-610 Knife Mod Project Complete

For the first post on this project click here. Cold weather was trying to get me down as I don't have a heated place to make cancer causing resin dust fly and temps outside have been hanging out in the 20s and below. Finally this weekend I said, no more waiting, got things to do. I turned on a little space heater two feet away, pointed at myself and started grinding. There is work yet to be done but the images are of a pretty much finished product. I can't specifically say why, but right now the pivot screw bottoms out inside the pivot which isn't completely threaded inside. I guess I understand why. The dimensions have been exactly determined at the factory; the standoffs are so wide, the blade + bushings are the same, handle scales + liners + standoffs is all the more threading you'll need in the pivot. Fine. It would be cool to get a little wiggle room and I made my scales very close to the same thickness as factory, but I did countersink both the pivot screw and pivot itself which was apparently just enough that the screw is now too long. A little grinding should help. But that doesn't solve all the problems. The original scales had a small section milled out for the lock bar to over travel slightly and I am starting to think that relief is necessary for proper function. The blade is too stiff. It opens fine and is usable but it's not smooth and fast like it should be. I don't really know how I'm going to remedy the problem because I don't have a good way to create that very small relief.

It's actually exactly the width of the RAT 1.
You will recall from the last post that the tip of the blade contacted the lanyard tube in the closed position. That problem is as we theorized. The blade had been peened in an attempt to make it hit the stop pin sooner - it didn't work. I removed the peened steel which of course didn't help but nothing would have. I would have to add material so the bottom line is that the detent has to keep the blade where it should be and I can live with that. We're just lucky the problem wasn't reversed where the blade hits the stop pin in the open position. I am also seeing where the blade is leaving a mark on the stop pin. This makes me question the quality of the pin (which is a threaded pillar) and the overall quality of the knife. It's a shame because I like the shape and feel but it would appear that it's not quite the level of the Enlan brand. I might take a shot at a second one just to see if I got a loser, but so far I haven't found a model in all the Chinese brands that I really love.

For one more downside, I cannot find screws that fit this knife. After much toil and trouble I was able to find a reliable source for M2 and M2.5 screws with Torx heads in a variety of lengths, but neither of those work here. Only the pocket clip screws had thread locker and all the screws are in pretty good shape, so it's not as if the screws had to be replaced anyway.
Note the flat spot on the standoff. The liner has a mate to it for anti-rotation, a nice feature. I did polish the washers and I believe I would have a silky smooth folder with a little more work.

navy k610 acid washed blade
I kept working on the blade to see what would happen and I eventually got this fairly smooth gray. It's just darker than everything else. The pocket clip took a nice smooth wash though.
Here you see the slab of paper micarta I used for the backspacer and the matching red liner.

how to make micarta
The scales rough cut early on in the process.
440C stainless steel, Sypderco Tenacious knock off
The finished product!

custom paper micarta liners, every day carry
There are some blade centering issues that I can't seem to overcome. Here you can also see how huge that pocket clip is. I should cut it down before I destroy something with it.

home made micarta, paper micarta backspacer
I finished the scales with 80 grit paper. It takes some doing to get an even look with paper that rough, but it leaves a soft, dry feeling to the scales that makes it feel good and secure in hand.