That is true if you have jointed the faces, but closer biscuiting is useful
when you haven't.
Sure, that more a recommendation for proper wood preparation than for
biscuits, but when your wood is wider than your jointer...
Time for my 2 cents worth. I have done a couple hundred panels, using
biscuits on every one. Most were cherry, but I also used walnut,
myrtle, maple, alder, hickory, and oak. I never had any bulges, or dips
from the biscuits. I place them 6 to 8 inches apart. On one table top
that was 2 inches thick, I did a double layer. Biscuits do help
reinforce a joint. I remember an article in Fine Woodworking that
compared failure tests on joints. A butt joint was the weakest, but
only slightly. Doweled, and biscuited, were a bit stronger, and mortice
and tenen were the strongest. They may not be necessary, but they do
add some integrity to the joint. I would never use them instead of a
mortice and tenon.
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