The Naiad Voyages

Mark Austen

2016.08.18 - Making Scarf Joints

it has taken me 3 hours to join four battens together to give me two longer battens. Read the scintillating story, with pictures, below.

Two pieces of wood that will form the sides of the jig with the slope marked on the side of one and two holes drilled on the lower line right through both pieces of wood.


Like this.


Long screws put in each hole pointing inwards as shown here.


The base plate rests on these screws.


Two more holes are drilled in the sides now I know where the base plate sits.


And shorter screws used to fix the base plate in position.


The long screws were left in place although I could have removed them.


Another piece of wood screwed at the bottom of the jig for stability and to stop the sides from being squeezed together when the jig is mounted on the workbench.


Two battens on the bottom of the slider to guide it along the jig.


Like this…


…and this.


Battens added to the top of the slider to stop the router from going too far and cutting the wrong bit or falling off.


And finally a slot to allow the router bit to poke through.


A test cut.


And a second one. This was a little skewed as I forgot to clean the shavings off the jig when I clamped the second piece in place and it was not level as a result.


Only a 5:1 taper but good enough.


Now for the acid test.


Not a bad fit at all. The battens will be planed after gluing up so a small mismatch will not matter.


The four battens with scarfs cut lined up ready to be glued. Resorcinol this time, not epoxy.


And now clamped up hard. I'll see how they have stuck on Sunday evening.