Isn't there going to be a problem getting the biscuit joiner flush against
the bottom of your dados? Nevertheless, gluing with your dados should be
sufficient. A properly glued up joint is stronger than the wood itself.
You're wasting your time for something that just isn't necessary.
Providing your cabinets have an attached back panel, the biggest issue with
biscuits "being strong enough" may be concerns about inherent strength of a
butt joint/biscuit jointing the shelves to the end panels if the shelves are
to carry heavy loads.
A simple method that may alleviate your concerns, and provide a good deal of
support, is to use both biscuits to reinforce the butt joint, and "ledger
strips", attached to the end panels and under each shelf end, to add
additional support to the shelves.
This is a very common practice/method of affixing shelving to utility
cabinets quickly and easily, and should provide all the strength you need.
Almost certainly yes.
I build a roll-around cabinet for my "benchtop" 16-speed drill press to
sit on. The drill press weighs a lot. The cabinet and three drawers
are all made of 3/4" MDF using butt joints and biscuits. The cabinet
top sits on the sides, which in turn sit on the base.
I made it as an experiment to see how it would hold up, and so far a
year later it's as solid as ever.
Ok.. If I'm understanding you, you aren't really asking about ADDING a biscuit
to a dodo, but replacing it with biscuits??
I'm not a "fine" woodworker, especially for things in my shop.. Guys like Ken
Vaughn build jigs that are nicer than most of the furniture in my house, and I
envy that attention to detail, I think..
For my shop(s) I do butt joints with biscuits and they seem to work and hold up
Most have backs for added rigidity and are wall mounted, so for my use, I don't
see a need for fancier joinery..
Most are pretty much plywood boxes with shelves and/or doors, no carcass
The dado center support is probably a good idea, but might be ok with a butt
joint and biscuits..
It would seem that a dado would be pretty easy and could be done with either saw
OTOH, I'm pretty much a turner and NOT good at flat work, so YMWV
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