Originally Posted by cabinetman
On long glue ups, using multiple biscuits, that the time needed to cut the slot, apply the glue, insert and set the biscuits, could cut into your "open time" for the glue. Biscuits can get skewed and stuck off alignment to the point that they can prevent a good tight closure under clamping.
+1. biscuits don't really have a place in edge glueing. Plywood face frame, yeah maybe but not great there either.
Simple long grain glue-ups joints are far stronger than the surrounding wood and the lumber will crack and fail prior to the glue letting go. It's important to have good fitted jointed pieces.
Originally Posted by bob sacamano
1 more thing about glueing up a top..............it DOESNT matter which way you orient the end grain on the boards - just arrange the boards for the best aesthetics
There's a novel idea... Why not do both? Alternating growth rings and aligning run-out are important but not the end all be all.
If you intend to hand plane the top aligning run-out is very important.
If you plan on having a flat table stay flat, choosing good lumber thats stable with short minimally curved growth rings and alternating the growth rings is indeed quite important... If they have any curve to them.
4r sawn, you say?... No need to alternate that...
Do you follow? The lumber dictates whether or not these rules have to be followed.
Good luck on your shelf and table!
~tom "Ignorance is not a lack of intelligence - it's a lack of know-how"