Introduction: Stepped Gooseneck Splice (Koshikake Kamatsugi)
Here's another Japanese architectural joint for you to try.
The Stepped Gooseneck Splice is used in groundsills to join sections.
The video might help you assimilate the written instructions better.
Step 1: Initial Preperation & Start Marking Out the Male Part
Square the sections to be joined
Mark the length of the joint to be about 1½ times the section width
Mark in the 'neck' width, and gauge it to the end
Measure for dovetail shoulders at the halfway point
Mark in the shoulders, and join up the head of the gooseneck
Mark the waste material
(Use the proportions in the photo's to size the joint to your work)
Step 2: Marking Out the Male Part Continued
Square in the verticals
Add a step half way down the sides
Mark all the waste areas
Knife in all the lines to cut
Step 3: Cutting the Male Part
Saw the lower half away, below the dovetail head (I've left the step portion remaining for the time being, but you don't need to)
Saw down the sloped sides of the dovetail head, and continue to the main joint shoulder line, before sawing the waste away to the shoulder line
Saw the shoulders of the dovetail head, and then pare away the waste to reveal the straight neck
The final photo shows me removing the step portion
Step 4: Layout of the Female Part
Place the male part in position above the other section, and mark around it.
Knifing the outline should improve accuracy
Mark in the waste, then transfer the step down to the halfway point, gauging round a line
Step 5: Cutting the Female Part
Saw down the neck lines, until the blade reaches the edges of the marked in waste
Now use chisels to chop and pare away the gooseneck socket
Finally saw off the step section
Step 6: Finishing Up
Test the fit - don't force it, since you will find it impossible to remove, if it jams, without damaging it
Make any adjustments for a good fit
In a groundsill application, gravity, together with the structure built upon it, should hold the parts together
In other applications, apply glue to the socket before assembly
That's all there is to it!
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