blade center?

W

willy m

Joined
Nov 27, 2007
Messages
255
would somebody please tell me an easy way to mark the centerline on the blade edge for a reference for getting even and straight cutting edges? i have been stacking copy paper till i got the entire thickness then using half the number of sheets as a scribe guide. it kind of works but is a real pain.
thanks,willy:)
 
I use the hardened points of my caliper. Set it a little off from the center so that I get
two lines about .02 apart down the edge.
 
Take a piece of brass bar, scribe a line in it, take a compass or divider, set that to 1 inch, put one point in your centerpunch, with the other find equidistant points on the line. Put 1/8 inch holes with 1/8 inch pegs in them on those holes, drill your initial centerpunch, affix a point in it, with each peg touching a side of the blade your point will be centered. Gets a bit hairy at the end, but you can make a variation on this tool to suit your needs once you're comfortable with this.
Somebody sells this exact device in anad in Blade Mag I think, but why buy something you can make in two minutes from scrap

-Page
 
You can also use a drill bit the same size as the thickness of your steel. Just make sure to get a pointy one. I find that cobalt ones work well, though they are kind of expensive.
 
I also use something like what James Muehlner said. First i color the edge with a sharpie, then use a drill bit the size of the blade and scratch a line in.
 
uncle al (uncleal.com?) a knife maker and machinist in arkansas sells a little do hicky for about 10 dollars that marks the center line on the edge of a piece of steel. it is a real simple tool that works like a router guide.
 
I'm with Dan,
Caliper is quick, easy, and accurate. If you do not have one you should anyhow. They're cheap buy one.
Matt Doyle
 
Yep Caliper does all kinda things,scribe lines.check thickness along blade,just a good tool to have.by the way I scribe 2 lines about .020 apart on thin blades and gride to that.
 
Dyechem, 4x18x18 granite surface plate, calculator and a height gage very accurate and easy.

Spencer
 
SAR said:
Dyechem, 4x18x18 granite surface plate, calculator and a height gage very accurate and easy.

Spencer
Click to expand...

I agree here, but it can be kind of expensive for the first time knife builder. There are other methods as described above that will get the job done without the added expense. Just my 2 cents worth.
 
SAR said:
Dyechem, 4x18x18 granite surface plate, calculator and a height gage very accurate and easy.
Click to expand...

I may switch to that since I picked up a used height gauge at Ashokan last
fall. Then I realized I don't know how to use a vernier gauge :o

The caliper is so easy and works so well that I don't have much motivation
to switch. Of course the granite surface plate is useful for so many other things that I use it constantly.
 
dlpierson said:
I may switch to that since I picked up a used height gauge at Ashokan last
fall. Then I realized I don't know how to use a vernier gauge :o

The caliper is so easy and works so well that I don't have much motivation
to switch. Of course the granite surface plate is useful for so many other things that I use it constantly.
Click to expand...

Some quick googling: http://www.physics.smu.edu/~scalise/apparatus/caliper/ I had wondered about that one, too!
 
Scrounge up an engine valve. Grind a bevel on the edge,chuck it into yer drillpress, adjust height. Run the profile edge against hte turning bevel. Flip it over , repeat and you have 2 center lines which you grind to.
 
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