Shelves of 3/4 ply, need to have dividers every 2"
The supply store did not have anything like traditional 1/4 HB for the
dividers, I ended up buying some 3/16 ply to use. Maybe a mistake.
How would you cut a 3/16 groove in the 3/4 boards? (I need them every 2",
making a total of 32 slots)
My sawblade is 1/8, my smallest router bit is 1/4 <sigh>
Most (all?) dado sets will only give you 1/4" w/ two outside cutters so
buy a 3/16" router bit is probably the most effective choice.
Otherwise, you'll have to double-pass on the saw which is twice the
work; twice the chance to make an error.
Alternative is use 1/8" grove and rabbet the top/bottom of the panels to
If you have a sled, you could drill a 1/8" hole in the base (not all the
way through) near the fence at a point 2" from the blade, then drop a
short piece of 1/8" rod in the hole so that it protrudes up from the
sled surface a short distance (somewhat less then the depth of your dado
cuts). Position the board against the pin, make a cut, then reposition
the board such the pin protrudes up into the slot you just cut, then
repeat as necessary. Drill another hole close to the first one, but
1/16" further away from the blade, reposition the pin in that hole, then
repeat the process, making sure to snug the board up against the pin
each time (since the new slot will now be 1/16" wider than the pin).
Test the positioning of that second hole on some scrap first; you may
need to reposition the pin by drilling a different hole if the width of
your dado is incorrect.
If it ain't perfect, improve it...
But don't break it while you're fixin' it!
On Sun, 27 Sep 2009 17:44:42 -0700, "Markndawoods"
When your fence is parallel to the body of the blade, the blade will
cut 1/8". If you make the fence unparallel to the blade, the blade
will make a wider cut.
I suppose, but that's a pretty bizarre technique. Probably not so good
either if you're looking for a really clean cut with perfectly straight
sides (which may not matter in this case), but an interesting suggestion
"Even if your wife is happy but you're unhappy, you're still happier
than you'd be if you were happy and your wife was unhappy." - Red Green
There's two ways to make pieces fit in grooves: Either enlarge the size
of the groove, or reduce the size of the piece. I'll leave this to your
determination as to it's usefulness, but you could possibly reduce the
size of the piece to the 1/8" required for your dividers. I'd only do
the edges of the ply that go in the groove.
This is probably a more viable technique for larger dividers where the
reduction is sorta like a dado & tongue and groove.
"The potential difference between the top and bottom of a tree is the
reason why all trees have to be grounded..." -- Bored Borg on
Make your slots 1/8" wide with your blade. Them with a straight router bit
shave 1/16" off of one side of the 3/16" plywood the depth of your slot.
I do this all the time, did it last week to make a so called 1/4" plywood
panel fit in a tight slot.
Or use a 1/6" spacer between your work and the fence. Make a pass, remove
the spacer and make the pass again.
Plastic laminate will probably work.
I just did this for a shoe storage unit. I needed 96 3/16" wide 3/16"
deep 16" long dados. I made a jig to use with my router which had a
1/8" downspiral bit and a 3/8" collar installed. My jig would make 3
dados before I had to reposition it.
Worked like a champ.
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