Marking Knife From Old File

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Introduction: Marking Knife From Old File

About: Open to learn new things. every time try something new.

It was a very simple and quick project.

I need a new marking knife to be able to mark something flat with a surface. That's why i decided for a design without a wooden handle.

I also choose dual bevel design because i find it simpler to be able to mark on both side or it goes both way.

Step 1: Marking and Cutting a File

For marking i use a simple marking tape and draw a simple design over it.

Than i follow the lines to cut the rough shape of it.

First i cut outer straight lines.

Than i rough cut rounds. and than i grind them to shape with grinding disk.

After the shape was OK, i start to grins the edge. and also grind off file teeth on the tip. Otherwise the blade would have teeth.

Step 2: Hardenind

I have to admit, this step was more of attempt of hardening than real hardening. My torch was not even close of hot enough. Only the tip of knife got cherry red. So i hope the most important part of knife is little harder :)

The theory is to heat it up till cherry red or till metal looses magnetism (magnet don't stick to it), than quickly put it in to water. And try to put it as straight as possible. That stress in metal don't pull it one way and bend the knife.

Step 3: Shapening

Final step was grinding on bench grinder for course grind. Don't forget to cool the knife. Bench grinder produces a lot of heat.

After that it was time for water stone. I used 1000 grit and polishing on 3000 grit.

Step 4: The Knife

It turned quite nice. it has some grinding marks that could be polished away, but already tested on stairs that i was doing, and it works like a charm.

I recommend a marking knife for all of you that are playing with wood.

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    4 Discussions

    Thanx for advice. i know that for drilling, i did't know for bench grinder. Thank you.

    Yeah, it's near impossible to get a blade up to critical temp with a regular torch. Nice job on the knife. Looks good.

    1 reply

    i see, you are talking form experience :) thank you.