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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 1191 views 0 times favorited 6 replies Add to Favorites Watch
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Dagobah

71 posts in 657 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

EarlS

1027 posts in 2342 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

Woodknack

11601 posts in 2374 days


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

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

-- Rick M, http://thewoodknack.blogspot.com/

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Loren

10373 posts in 3642 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

Ocelot

1974 posts in 2632 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?

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Dagobah

71 posts in 657 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.

Thanks!

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MrRon

4758 posts in 3237 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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