Basically it's like a box joint (finger joint seems very hard to reproduce by average home tools) but with much bigger teeth (about 60mm one tooth). So it's a box joint basically.
please read again my post on me not being very wood and engineer smart. :)
My thought process.... :D Whell, I did want to use screws, I wanted some kind of joint that would make a tight fit. So butt joint was out of the question. I have thought about through dado joint that I would make on a tablesaw, but in my limited knowladge and experience I thought box joint would be stronger solution. So that is not the case?
Does it play a role that my boards which I usually make stuff out of (pine, spruce) are 20mm thick?
So to dado it and to move away from the edge would be good at lease 5mm (more?), and then dado 10mm and leave another 5mm on the other side.
Would that be strong enough for such application)
Also somehow I had bad experience with dados (basically I made door panels for cabinets which do kind of fall into groove and tounge (dado) slot does it not), because it was hard for me to catch right thickness so that it would slide in just right, regarding how deep and how snug. You know what I mean? Maybe with practice I would get a hang of it.
The other problem is also I don't have dado blades, but making more passes obviously is not a bit deal, it is only the question of clean cut.
Thank you for helping me improve, I don't like this box joints too much because there is also so much work put into them.
This is how this cabinet looks like, these doors open upwards. My main time thing I would like to differentiate from is that side to top and bottom joint (which is on the picture in the first post)
Size is approx. 1000x400x370mm