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Yet Another Kerfmaker

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Project by Greg Wurst posted 08-07-2009 04:20 AM 36660 views 24 times favorited 11 comments Add to Favorites Watch

Nothing you haven’t seen a half-dozen times now. I made this today out of some maple scrap. Extremely quick and easy to build. I made the rabbets on the jointer and used an 1 1/4” carriage bolt and a wingnut with a large fender washer to hold it together.

Works pretty-well, but if you can see in the crappy cell phone picture an ATB blade is not the best choice here. I’ll need to get a flat-bottom blade if I plan to use this for anything other than cross lap joints where you don’t see the bottom of the kerf.

Since I cut the one piece to match the saw blade kerf I’ll either need to get a thicker blade or create an adjustment feature with a screw or such as other have done.

EDIT: You can get a couple Sketchup files I made with an alternative no-rabbet design here:

http://cid-258899c12334cc4d.skydrive.live.com/browse.aspx/Kerfmaker%20Clone

-- You're a unique and special person, just like everyone else.





11 comments so far

View Sawdustonmyshoulder's profile

Sawdustonmyshoulder

286 posts in 2414 days


#1 posted 08-07-2009 04:52 AM

OK. OK. Enough!!! I will make one this weekend. Just quit posting them!!!! AAAAAHHHHHH!

Nah, great work, Greg. Yes, I’ll have to have one since all the other folks have one.

I think I will make mine to use with a stacked dado. I will just have to add an adjustment screw that will extend to say 1/4 inch or 3/8 inch.

What do you all think?

-- Makin' Sawdust!!!

View Scott Bryan's profile

Scott Bryan

27251 posts in 2608 days


#2 posted 08-07-2009 04:53 AM

Greg, you are right this is a pretty versatile jig and certainly is not a complicated build at all.

Nice job.

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

View a1Jim's profile

a1Jim

113012 posts in 2363 days


#3 posted 08-07-2009 04:59 AM

well done another great Kerfmaker

-- http://artisticwoodstudio.com Custom furniture

View Bureaucrat's profile

Bureaucrat

18330 posts in 2438 days


#4 posted 08-07-2009 06:46 AM

I missed something. What are these things for?

-- Gary

View Jimmy's profile

Jimmy

44 posts in 2126 days


#5 posted 08-07-2009 07:15 AM

i am a new woodworker and the build confuses me even though it is simple. looks like a great tool. any chance of getting a how to? i know myself and many other new woodworkers could reallly use one. thanks and may you create many piles of sawdust

-- 20 year old new woodworker. advice and tools much appreciated.

View Greg Wurst's profile

Greg Wurst

783 posts in 2619 days


#6 posted 08-07-2009 02:39 PM

Jimmy – Here are some pictures that should help you if you want to make one like mine:

If you use a 1/4” carriage bolt like I did drill the 1/4” hole very close to the edge of the lip 1 1/2” from the top. Drill a 1/2” counter bore on the back to recess the head.

If you don’t want to cut the rabbets you can do what SPalm did and just glue a 1/4” piece on top of square stock:

Click for details

I also cite SPalm’s description for cutting the saw blade kerf on the piece with the bolt hole:

To compensate for the exact width of the blade, I came up with a technique. Cut both sticks to the same length by closing the device all the way shut. Cross cut through both sticks to make them flush. Now the stick without the end piece on it needs to be reduced by a saw thickness. Clamp and cut a piece of scrap on the right hand side of a miter gauge. Slide this stick right up to this scrap and cut. Exactly one thickness will be removed.

I’ve added a link to my Sketchup files in the original post if you want to download them. Let me know if you have any questions.

For usage instructions you can refer to the video for the original product:

You basically just flip the kerfmaker once you’ve cut one side of the dado.

-- You're a unique and special person, just like everyone else.

View Greg Wurst's profile

Greg Wurst

783 posts in 2619 days


#7 posted 08-07-2009 05:16 PM

I’m using Sketchup6 free version. I assume you mean the hole in the laminated version? I drew a rectangle on top of the original piece and did an intersect with model to get the circle transferred to the rectangle. It then got the lines in it once I pushed it through the piece. It was a quickie so I let it go.

-- You're a unique and special person, just like everyone else.

View Greg Wurst's profile

Greg Wurst

783 posts in 2619 days


#8 posted 08-07-2009 05:32 PM

I have version 7 and played with it a bit, but all the cool features I wanted were in the pro version. In the short time I have used it I didn’t see anything new that really grabbed my attention. Anything special you’ve noticed that might sway my opinion?

-- You're a unique and special person, just like everyone else.

View ChuckM's profile

ChuckM

505 posts in 2453 days


#9 posted 08-08-2009 08:10 AM

Keep it comin’. Let’s make this one of the most popular projects!

-- The time I enjoy wasting is not time wasted

View SPalm's profile

SPalm

4974 posts in 2668 days


#10 posted 08-08-2009 02:28 PM

Sweet.
Keep ‘em comming.

Steve

-- -- I'm no rocket surgeon

View Greg Wurst's profile

Greg Wurst

783 posts in 2619 days


#11 posted 08-08-2009 03:51 PM

I was very interested in the dynamic components in 7, but it’s onlyin the pro version and I’m cheap.

I’m going to play with 7 some more. There was some reason I didn’t stick with it but I can’t remember what it was.

-- You're a unique and special person, just like everyone else.

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