Marking the centre line of a knife edge

Hi to all my followers :).

The post is actually need to be called:

Marking the centre line of a knife edge prior to establishing the bevel.

It’s been some time now that I wanted to post a little trick about how I improved my method of marking the blank blade edge prior to grinding the bevel.

The original trick was to improve a known technique (the one that using a drill bit inscribing against the edge of the knife to mark the centre line) . the old technique was working well but, it is nuisance on your fingers and a lot of time the centre line turn to be crooked.

So my ‘brilliant’ idea was simply to clamp it to the base surface, to avoid the needs of using my fingers to hold the drill bit (you may say Dhaa.. and rightly so). For me however it was enlightenment and it worked. Knife edge center line marking

The thing is, that it is not the best technique out there and there are lot of ingenious gadgets that one can see on the internet.

But then I had a divine revelation. For some reason (which I won’t bore you with), I accumulated a lot of discarded unfinished blades. Most of my knives are either 4 or 5mm in thickness. Its mean that I use 4 or 5mm drill bit for marking the centre line.

And here is the thing.

Way not taking the tang bit of a blade, and use it for marking? It is flat, it is exactly the thickness that I need and it is harden able steel.  Marking knife edeg

So all I had to do is take one 4mm peace of steel and one 5mm peace. Grind one end to give it a 45 degrees edge and give it a proper heat treatment. As I want it hard as possible I didn’t bother with tempering.

Marking knife edgeMarking  knife edge

Now we talking. It is flat so it didn’t wiggled while scribing and do as good job as any high tech gadget out there. knife edge center line marking

It is not important to establish precise symmetrical hedge.   If it’s not symmetrical, inscribed one line on one side, then flip the blade over and inscribed another line on the reversal side of  the blade.  You will get a double line that marking the centre. Marking the edge of a knife

That is good, as you anyway want to leave some thickness to the cutting edge of the blade, for the heat treatment process . If the double line are too wide, then you can always grind a little bit more to close the gap.

That it.


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