How to cut a dado for a bottom panel when one side of the box is angled?

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Forum topic by Dagobah posted 08-14-2017 05:17 PM 1523 views 0 times favorited 6 replies Add to Favorites Watch
View Dagobah's profile


80 posts in 1550 days

08-14-2017 05:17 PM

I’m building a box that has one angled side. Typically I would cut a dado to fit the bottom panel, but since one of the sides is at a 18 degree slant, the dado wouldn’t match up to the other 3.

Imagine the side profile of the box looking like this: | _ \

What options do I have to put a bottom panel on the box?

6 replies so far

View EarlS's profile


4015 posts in 3235 days

#1 posted 08-14-2017 05:23 PM

If you cut the bottom panel edge at 18 deg to match the angled side then measure the length of the cut you should be able to set a dado for the side piece that will match the angled cut on the bottom piece. Hopefully my explanation makes sense.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View Woodknack's profile


13504 posts in 3267 days

#2 posted 08-14-2017 05:28 PM

Cut the dado at an angle, unless I’m misunderstanding.

-- Rick M,

View Loren's profile


10725 posts in 4534 days

#3 posted 08-14-2017 05:31 PM

If the bottom rim of the box is flat you
can dry-assemble it and cut a groove
for the bottom on a router table with
a bearing guided 1/4” slotting bit. The
corners of the groove can be squared
up with a chisel. The groove in the
angled end will also be shallower unless
you switch bearings.

View Ocelot's profile


2622 posts in 3525 days

#4 posted 08-14-2017 05:47 PM

Why not just tilt the blade on the table saw. single pass with Dado stack. do a test on scrap first. Am I missing something?

-- I intended to be a woodworker, but turned into a tool and lumber collector.

View Dagobah's profile


80 posts in 1550 days

#5 posted 08-14-2017 06:26 PM

Hah! I hadn’t even thought to use the table saw!

I’d been planning on using the router table to make all the dados, as two of them need to be stopped (the box needs to be joined using butt joints). But the angled piece will have it’s edges hidden, so the table saw will work. I’ll just need to make a few test cuts on scrap to make sure the router cut dados match up to the table saw cut ones.


View MrRon's profile


5943 posts in 4130 days

#6 posted 08-14-2017 06:36 PM

Cut the dado at the 18° angle and bevel the bottom panel 18°.

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