Kerfmaker 9000!!! - a.k.a. simplest kerfmaker ever

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Project by rweitz posted 1627 days ago 3041 views 6 times favorited 10 comments Add to Favorites Watch

I used my own “poormans” version of a Kerfmaker to make the new dados on the framing for my table saw router table extension. The hardboard is about the thickness of my 1/8” blade’s kerf. I can tighten or loosen the dado by adding and removing layers of masking tape. First I use the “kerfmaker” to make a cut. Then a cutoff from the stock that’s going in the dado to step off the second cut – and nibble away the rest for a perfect fit. The photos above should show what’s going on.

Thanks to all on this site for the info on how to use this idea and to Bridgetown for their great product which is still on back order or I would not have had to make this one!!!

-- You cannot build a reputation on what you are going to do. - Henry Ford

10 comments so far

View Chase's profile


448 posts in 1652 days

#1 posted 1627 days ago

I see what you have going on here. They might be too thick, but try using playing cards as shims to get that last little bit on the kerf. Just a suggestion, i like how simple the jig is!

-- Every neighborhood has an eccentric neighbor. I wondered for years "who was ours?" Then I realized it was me.

View JJohnston's profile


1577 posts in 1916 days

#2 posted 1627 days ago

This demonstrates that you know the concept behind the kerfmaker, not just that you can copy someone else’s work. I never could get my brain around the concept. Maybe if I study this bare-bones example…

-- "Sorry I'm late. Somebody tampered with my brakes." "You should have been early, then."

View SPalm's profile


4783 posts in 2507 days

#3 posted 1627 days ago

I like it a lot. It looks like it is easier to set up the first cut. This seems more like a technique than a jig, which is really cool. It would work for for larger and odd shaped pieces too.

Good job,

-- -- I'm no rocket surgeon

View dusty2's profile


312 posts in 2054 days

#4 posted 1627 days ago

Neat solution.

To facilitate micro adjustment, I have been using the sample credit cards, gift cards and the like that I get unsolicited in the mail. For a long time, I shredded those but then realized they could be useful. I keep a plastic cup on the work bench to store them.

I also use the see through document protectors for micro-shims. They are durable and measure about .003” or less and are virtually indestructible..

-- Making Sawdust Safely

View AaronK's profile


1396 posts in 2090 days

#5 posted 1626 days ago

yes. YES. YES!!!.

making a kerfmaker has been on my to do list since i first saw them pop up here. but this is something i can do TONIGHT and in about 2 minutes. sweet. thank you.

View AaronK's profile


1396 posts in 2090 days

#6 posted 1626 days ago

awesome. i just did this in the 2 minutes i thought it’d take. I used a scrap piece of thin polycarbonate that I thickened with glossy scotch tape to get a snug fit in a single blade kerf. then using your method i got a perfect dado in seconds. thanks again!

View TopamaxSurvivor's profile


14721 posts in 2301 days

#7 posted 1626 days ago

Great idea, thanks.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View jm82435's profile (online now)


1260 posts in 2367 days

#8 posted 1626 days ago

That is a pretty slick trick. I use calipers and an indicator – kind lacks the panache of your method though.

-- A thing of beauty is a joy forever...

View mafe's profile


9483 posts in 1714 days

#9 posted 1434 days ago

Thats a quite clever idea!
You can give it new names after the layers of tape – kerfmaker 9004 – and then name your sawblades…
But it’s not as sexy as a kerfmaker…
Best thoughts,

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View Roger's profile


14318 posts in 1429 days

#10 posted 732 days ago

Super simple. Very nice. Playing cards serve big purpose in my shop for shims n such also

-- Roger from KY. Work/Play/Travel Safe.

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