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hand made Surival Knife

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vivanicola

Joined
Mar 15, 2016
Messages
2
SURVIVAL tool PROJECT: hello everybody, I am trying to make knife with a drop point double edged blade, but on the straight edge I would like to have a double tooth saw. (as in the picture
300-401_2.png
)

does anyone know which kind of tool or machine would I need to have that result? or can suggest a video link? maybe it's not even feasible in a home shop..

thanx in advance!

Nicola
 
This would probably be better discussed in the Shop Talk sub-forum. Interestingly, I wanted to try the same thing early on on my knife making endeavors. It could probably be done on a CNC machine but you're probably not ready for that kind of investment. I think it's doable with small files... a lot of tedious work, but I think it's possible. Good luck:)
 
Agree with Ben, small files should do the trick. You also have to consider that for the saw to work properly, the teeth need clearance. Do a full flat grind, cut in your teeth in to your desired length, then do your second grind between the last tooth and the point to create a dagger section.

If you grind a double edge for the full length of the blade, you won't be able to have saw teeth. The best you could hope for is a serrated edge. Hope this helps. Peter
 
thanx for answering my question, I thought maybe there was some knife making trick (a special file or such) to make what I think is an indispensable tool in a survival bushcraft tool.

I thought about a CNC machine, but besides the cost of the machine, the result would be at best a serrated edge, just slightly better than if made by hand.
these double tooth saws are more sophisticated than they look, are very sharp too, and have different lenghts.
to achieve the same result with a CNC machine would require an incredible effort in terms of programming, which is not our hobby!

thanx again, may I'll follow your tip and repost in a shop section.
 
Hi Nicola, I am a saw and tool guy. As a previous response suggested you need clearance for the teeth. On a saw like that clearance is obtained by grinding a reverse bevel on the blade, that is to say that the spine of this blade is narrower than the cutting edge. It's probably about a 2 1/2 degree bevel on both sides or 5 degrees inclusive.

The teeth on that saw were ground in with a finely pointed grinding wheel, it could be done on a tool and cutter grinder. Files made for saw filing are triangle files, they have 60 degree angles on them. A similar saw to yours pictured could be made using triangle files but the points would not be quite as acute. The angles in the gullets of your saw appear to be about 30 degrees.

There is lots of information on the web about filing saws, Google "saw filing" and you will get a basic idea of how it can be done. Saw filing is becoming a lost art, not many people doing it these days.

As you seem to have surmised, not very many of the "saws" we see on survival knives these days are actually useful for sawing, the geometry is just not right (it is right in your example) The best one can hope to do with most survival knife saws is worry something in half, it's best to just chop it in half with the cutting edge. But, those saws do look cool on the back of the blade.

Good luck, have fun, Mark
 
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