When you are working with two different thicknesses you will want to set everything up and use the screw length for the thinner thickness of the two. For example if you are drilling your holes in a 2X4 and attaching it to a 3/4" piece you will want to set the jig and the depth collar for the 3/4" setting and use a 1 1/4" screws. If you are going the opposite way and drilling your holes into the 3/4" piece and joining it to the 2X4 you would set everything up the same, but you can use a little bit longer screw to give you some more strength.
Now when you are choosing which thread you will need to use, it will be determined by the piece you are joining to. For example: if you drilled your holes into a piece of plywood but you are attaching an oak piece you will want to use a fine threaded screw since the majority of the threads will be in the oak piece.
Hopefully this made some sort of sense lol.
If I am joining a 2x4 and a 1x3 (3/4 stock), does it make a difference if I am starting the screw in the 2x4 as opposed to the 1x3?
I use the jig and drill bit settings for the piece where I am starting the screw.
But for the screw length, do I select that according to the receiving piece thickness?
I don't quite remember who originally postedd this, but it may help when deciding which screw size to use. I believe the sizes outside the grid are the "whole" pieces and the sizes inside the grid are the "screw into" pieces.
This is a wonderful chart! And one I will certainly hang in the workshop. I want to make clear... which is the receiving lumber? The horizontal numbers? The vertical numbers have the pocket holes?
Dan said:I don't quite remember who originally postedd this, but it may help when deciding which screw size to use. I believe the sizes outside the grid are the "whole" pieces and the sizes inside the grid are the "screw into" pieces.