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

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Project by rweitz posted 03-08-2010 09:52 AM 4024 views 7 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 2988 days

#1 posted 03-08-2010 02:45 PM

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


1622 posts in 3253 days

#2 posted 03-08-2010 03:06 PM

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…

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

View SPalm's profile


5317 posts in 3844 days

#3 posted 03-08-2010 03:16 PM

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


323 posts in 3391 days

#4 posted 03-08-2010 03:17 PM

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 (online now)


1506 posts in 3426 days

#5 posted 03-08-2010 08:15 PM

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 (online now)


1506 posts in 3426 days

#6 posted 03-09-2010 12:30 AM

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


18241 posts in 3638 days

#7 posted 03-09-2010 04:13 AM

Great idea, thanks.

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

View jm82435's profile


1285 posts in 3704 days

#8 posted 03-09-2010 06:11 PM

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


11643 posts in 3051 days

#9 posted 09-16-2010 11:16 PM

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


20923 posts in 2766 days

#10 posted 08-19-2012 12:22 PM

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

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

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