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Sam,
It's a good practice to make sample test pieces from scrap material, of equivalent material thicknesses---
double check your settings and screw length---
before attemping the final joining of your finish pieces.
You want it to be clear in your mind that the results are satisfactory.
PS---I've used 1-1/2" long screws, for joining 3/4 stock to 2-1/2" stock---
the joints were solid.
I agree with Ken (as usual). If the 3/4" pieces fit flush with the face of the thicker piece, then you'll need to go back to a standard (1 1/4") screw. If there's an offset, though, that allows you to drive in a longer screw.
I would drill a pocket hole in a piece of scrap 3/4" stock, and then drive in a screw, letting it protrude from the end/edge of the board. Then hold it up against the thicker stock in it's approximate position, and see where the screw lands.
As Ken said, it's always a good idea to test/experiment when you're joining pieces of different thicknesses.
Even with short screws, you'll get great strength in your assembly as you draw all the parts together.
KregRep
PS---
The greater quantity of screw threads that engage into the workpiece, the greater holding power.
Longer shanks resist pullout and ensure maximum engagement.
I strive for all the screws threads to engage into the work-piece.
If only the leading tapered end of the screw is engaged, the screw will lose its holding power---
and "strip-out", with minimal torque.
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