Kerfmaker - Thanks for the idea

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Project by SimonSKL posted 07-31-2009 10:47 PM 19777 views 166 times favorited 19 comments Add to Favorites Watch

I hope you are not tired of looking at another kerfmaker. There has been a few in the last few days. My version is exactly the same as Bobthebuilder’s as I thought his is the most simplified version with blade adjustability. My only change was to move the wingnut hole up as close to the arm as possible to allow me to cut wider dadoes, up to 2 1/2”.

My first dado was a hair loose. After I tightened the screw a little, the fit was perfect. This tool will definitely have a place in my tool drawer. I want to thank all those who posted this great device and ideas.

-- Simon, Danville, IL

19 comments so far

View Scott Bryan's profile

Scott Bryan

27250 posts in 3823 days

#1 posted 07-31-2009 10:54 PM

Simon, this is another nice interpretation of the kerf maker. This looks like a nice addition to your shop. I may even have to get on the band wagon and do one of these as well. It sure beats simply running test pieces or calipers to determine the dado’s width.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View a1Jim's profile


117095 posts in 3578 days

#2 posted 07-31-2009 10:59 PM

I agree with Scott , well done

-- wood crafting & woodworking classes

View BeachedBones's profile


201 posts in 3403 days

#3 posted 08-01-2009 12:22 AM

This has got to be the largest shared/copied idea ever. So nice when a simple and useful project like this is posted. Thanks to everyone contributing!

P.S. I also made one.

-- You know.... I think that old wood needs to be furniture.

View ChuckM's profile


608 posts in 3667 days

#4 posted 08-01-2009 01:59 AM

Got to make one after my vacation. Btw, would you please share with us the measurements of the pieces so we could make a duplicate of yours more quickly? Also what’s the size of the bolt / wing nut? Thanks.

-- The time I enjoy wasting is not time wasted

View bobthebuilder647's profile


128 posts in 3253 days

#5 posted 08-01-2009 02:33 AM

Great job.

I realized the placement of the bolt could be problem with mine today. I was trying to avoid that knot in my piece, but I think I will move the nut to the other side like yours. Lots of great minds working together, I love it!

-- Rick, Pa. Courage is what it takes to stand up and speak; courage is also what it takes to sit down and listen.

View SimonSKL's profile


185 posts in 3240 days

#6 posted 08-01-2009 06:26 AM

The bolt and wing nut are 1/4”. The bolt is 1 1/2” long. I also used a lock washer to keep the bolt from turning when I tighten the wing nut. Hope it helps

Here is a Sketchup drawing of my kerfmaker.

-- Simon, Danville, IL

View hootr's profile


183 posts in 3347 days

#7 posted 08-01-2009 12:53 PM

thanks for the pics and sketchs

-- Ron, Missouri

View SPalm's profile


5320 posts in 3883 days

#8 posted 08-01-2009 12:55 PM

Sweet. Very nice.

When you go look at the original compared to this, the difference in simplicity is amazing. And yours even looks nice too. We all have to ban together and do the same treatment to some other shop jigs.


-- -- I'm no rocket surgeon

View ChuckM's profile


608 posts in 3667 days

#9 posted 08-01-2009 06:30 PM

Great sketches. If anyone still wondered if it was a good idea to be a LJ, the thread on the Kerfmaker should remove any doubt once and for all. Where else could one come across so many generous ideas and woodworking buddies? My favorite saying again: “There are no hard times for good ideas.”

-- The time I enjoy wasting is not time wasted

View Dovetail's profile


27 posts in 3114 days

#10 posted 11-24-2009 08:30 PM

I assume the screw at one end of the jig is an adjustable spacer for the saw blade thickness?

I added this to my favorites. I’ll make it when I have some free time. It looks to be a very useful device.

-- Dovetail

View SimonSKL's profile


185 posts in 3240 days

#11 posted 11-24-2009 09:09 PM

Dovetail, you are exactly correct. By adding an adjustable screw you can pretty much use the kerfmaker with any blade thickness.

-- Simon, Danville, IL

View Dusty56's profile


11819 posts in 3689 days

#12 posted 11-27-2009 05:37 AM

How did I ever miss this one ?? LOL
Great job and simple enough to make with your excellent sketchup plans : ) Thank you !

-- I'm absolutely positive that I couldn't be more uncertain!

View Grumpy's profile


23928 posts in 3852 days

#13 posted 11-30-2009 12:40 AM

Great jig Simon. Simple & practical.

-- Grumpy - "Always look on the bright side of life"- Monty Python

View abie's profile


874 posts in 3771 days

#14 posted 12-24-2009 05:54 PM

Simple Simon.
Had to say that.
Made three so far and Your pictures helped explain the screw in the end.
Now to test them.

-- Bruce. a mind is like a book it is only useful when open.

View Glen's profile


116 posts in 3078 days

#15 posted 12-25-2009 07:36 AM

Nice and simple. I’m going to make one of these. Nice clear pictures showing it at work and sketch-up drawing. Thanks Simon.

-- Glen

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