What is the best techniques to make the hole in the board ? I need a 10 cms deep for a 13 cms board …
I have a router with bits but small like 3/4 cms … electric jigsaw , circular saw , TNT ?
I saw a square knife hot wire but I don’t have one !!!
It’s quite easy, just use a 8mm metal drill and grind down the head to make it flat.
Works like a charm.
I’ve used two metal rods as a guide rail for the router to get consistent depth.
Just check out my build:
