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5 Minute kerfmaker - how does it work

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Blog entry by George_SA posted 07-30-2012 07:17 PM 3437 reads 12 times favorited 5 comments Add to Favorites Watch

I ran into a problem while making my new box joint jig BJ2. My kerfmaker KM1 does not open wide enough for the kerf that I need to cut.

What to do? OK (sigh) This project will have to put on hold while I make a bigger kerfmaker :-(

Then a flash of inspiration hit me

After fiddeling with the kerfmaker and getting it right sometimes I finaly understand the principal behind it.
All that I need is a spacer that makes an allowance for the blade thickness on the one cut. Off to the scrap bin. Cut the block square. Screw in a flat headed screw until it protrudes the same thickness as the blade and there you have it :-)

How does it work?

The first cut

(that will be the left cut if your stop block is on the left of the blade or the right cut if your stop block is right of the blade)
Use the work piece you want to cut a kerf for as a spacer. (Basically the same procedure that you use to set the standard kerfmaker, you just use the work piece instead of the kerfmaker for a spacer.) For this cut you don’t take the blade thickness into account.

The second cut
Use only the kerfmaker as a spacer and flip it around to take the blade thickness into account.

Now just nibble out the waste between the cuts.

How to micro adjust for a perfect cut:

Use the micro adjuster screw and turn it out to make the kerf smaller and turn it in to make the kerf larger.

This should only be necessary the first time. Thereafter it will work fine.

After adjustment: a perfect fit!

I hope the above makes sense. Feel free to ask if you don’t understand and I will try to answer.

-- There are some things that money can't buy - Manners, morals and integrity



5 comments so far

View Alexandre's profile

Alexandre

1417 posts in 858 days


#1 posted 07-30-2012 07:28 PM

George, Where do you get your wood from in SA?
Also, Which province do you live in?

-- My terrible signature...

View George_SA's profile

George_SA

197 posts in 880 days


#2 posted 07-30-2012 07:39 PM

Hi Alexandre
I live in the FreeState province in a small town called Reddersburg which is 60km to the south of Bloemfontein. I have been living here for about 2 and a half years. Before that I lived in Potchefstroom in the North West Province.

Most of my wood is ods and ends picked up here and there or given to me. When I do purchase I buy from a wood merchant or from the DIY hardware store or from Builders Warehouse if I need pine or meranti. I have not purchased any wood here in Bloemfontein yet, but in Potchefstroom there is a nice wood merchant dealing with hardwoods. I see in the yellow pages that there is also a hardwood merchant in Bloemfontein, but I have not had a chance to go there yet.

-- There are some things that money can't buy - Manners, morals and integrity

View Alexandre's profile

Alexandre

1417 posts in 858 days


#3 posted 07-30-2012 09:38 PM

Isn’t builders warehouse damn expensive?

-- My terrible signature...

View George_SA's profile

George_SA

197 posts in 880 days


#4 posted 07-31-2012 05:34 AM

Sometimes they are, but I watch for their specials.

-- There are some things that money can't buy - Manners, morals and integrity

View rance's profile

rance

4135 posts in 1827 days


#5 posted 07-31-2012 05:51 AM

Well, I was gonna suggest my Disposable KerfMaker but I think you’ve come up with a great solution yourself.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

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