Creator of Sawdust
Join Date: Aug 2007
Location: St. Augustine, FL
Biscuit joinery alignment problem
Woodnthings - the pic of your set up; i.e. the dewalt BJ, the sheet stock as a base and clamping down the work piece is exactly the way I'm doing it with exactly the same BJ. On shelf trim which is typically only 3/4 to 1 inch thick, I don't typically reference off the top of the piece, mostly because the surface area of the top is not sufficient to stabilize the biscuit joiner. The way you have it pictured is far more stable to getting a good parallel biscuit slot into the piece.
I must be screwing something up between the two surfaces for them not to be aligned. Theoretically, referencing from the same surface on both pieces the alignment should be perfect.
Thanks for the tips to all. At least I know that the procedure I'm using is correct; it's just me that's messing it up.
BTW, I was able to correct the problem with a flush trim bit and running the piece through on my router table. So the project came out well.
Happy New Year to all.
Stay safe in the shop.