This episode shows the detailed instructions to cut half-blind dovetails on the Leigh D4R jig.On half-blind dovetail joints, only one side shows. The D4R has specific scales to create these in three steps:
- Space the fingers to suit your taste – creating the joint design
- Route the tails using a suitable router bit, and with the board arranged vertically
- Route the pins with with the same router bit as was used to route the tails, and with the pin board clamped horizontally
Fine-tune the tail / pin fit by adjusting the bit height in the router, typically moving up just a few thousands of an inch. This will make the pins a little narrower, loosening the fit ever so slightly.
When I first started using my D4, this was the one adjustment that took me about an hour to master. The adjustment of the router bit is very small, to obtain the best fit!It IS truly this simple with the D4R!
I have used my old D4 for several years; by recording all the settings when I make a new box, I can return to the same setting(s) in just two minutes or less; in addition, I keep the old setup pieces I used when making the original adjustments for each router bit and wood thickness. I recommend you follow the same practice, and you will be quite happy with the results, no matter how much time passes between projects requiring half-blind dovetails.