KM-1 "like" Kerf Maker

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Project by ScottM posted 08-07-2017 01:59 PM 1237 views 14 times favorited 8 comments Add to Favorites Watch

This project is modeled after the Bridge City Tool Works KM-1 Kerf maker. It’s a tool designed to cut precise notches, dadoes, grooves, etc in wood without all of the guesswork and repetitive “sneaking up” on a cut. I won’t go into all of that here. Google is your friend to see how it works.

I got the idea to build this after seeing a few here on LJ but especially this one posted by Jerry. Not sure what it was but I thought I’d give it a shot. He provided some basic measurements and from those I made a Sketchup and went to work.

My wife just kept asking, “why don’t you just buy one” even after I told her how much they cost but I thought I’d give it a try.

It is made from some scraps of spalted maple and Angelique that I got from Woodcraft a couple of years ago. Instead of brass I used some bar aluminum that I got from Lowes. It can use up to a 1” kerf blade and accommodate up to about 4 1/4” groove. Much more than I’ll ever need or be able to use since my saw can’t hold a dado stack that wide. I tried it out with my regular thin kerf ATB blade and it made a nice tight notch. I sprayed it with two coats of satin lacquer to keep it from getting all stained up.

8 comments so far

View Upgrayedd's profile


77 posts in 1021 days

#1 posted 08-07-2017 02:14 PM

First – very nice kerfmaker! Well done.

Kerfmakers are nice, but I prefer this method:

Creating a custom spacer block for the exact material you will insert into the dado is my go to method. It works whether you use a single blade or any combination of dado blades.

On this project,

since I was making dado’s and rabbet dado, I set the dado stack to 3/8” and made 2 passes using my custom spacer block. Works great.

-- Upgrayedd - spelled thusly, with two Ds, for a double dose of this pimping.

View ScottM's profile


565 posts in 1985 days

#2 posted 08-07-2017 02:41 PM

Right, this jig does the exact same thing except the blade kerf is adjustable. You don’t have to have a separate spacer block for every size dado stack or blade that you might use. Gauge your blade, gauge your material and off you go.

View GR8HUNTER's profile


2966 posts in 551 days

#3 posted 08-07-2017 02:57 PM



View helluvawreck's profile


29192 posts in 2705 days

#4 posted 08-07-2017 05:51 PM

You did a really nice job on this kerf maker and it be a nice project to have for your shop. Congratulations.

helluvawreck aka Charles

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View handmadewithashley's profile


21 posts in 136 days

#5 posted 08-08-2017 01:43 AM

Very nice! I could use a little jig like this.

-- Ashley, Alabama, Instagram - @handmadewithashley,

View  woodshaver Tony C   's profile

woodshaver Tony C

5552 posts in 3192 days

#6 posted 08-08-2017 01:49 AM

Looks good Scott!

-- St Augustine FL, Experience is the sum of our mistakes!

View Charlie's profile


22 posts in 159 days

#7 posted 08-08-2017 11:29 AM

Nice job! Handy little gadget!

-- Charlie

View ScottM's profile


565 posts in 1985 days

#8 posted 08-08-2017 11:47 AM

Thanks guys and gals. Now I have to find something to make with it.

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