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