LumberJocks

birdsmouth router bits

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Blog entry by haskins posted 01-07-2015 12:35 AM 2281 reads 1 time favorited 5 comments Add to Favorites Watch

I recently discovered on YouTube these bits that are called birds mouth router bits. They make 6,8,12 sided boxes by cutting a notch of a certain angle in the board down its length. Once routed, the board is cut to length dependent on the shapes diameter. The interlock makes glueing and clamping incredibly easy. I got a set of three for $40

-- father son woodworks



5 comments so far

View patron's profile

patron

13535 posts in 2801 days


#1 posted 01-07-2015 02:20 AM

they look like a simple way to make polygon boxes or columns

one square edge
the other flat against the bit
make a longer board and just cut the pieces to length

still building a shop here
but one of these days
i’ll get some

welcome to LJ’s !

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View shipwright's profile

shipwright

7164 posts in 2258 days


#2 posted 01-07-2015 03:29 PM

Birdsmouth joints are too easy to make on a table saw and you aren’t limited in the thickness of your material.
I guess the bits are nice but if you have a TS, you don’t need them.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View haskins's profile

haskins

124 posts in 698 days


#3 posted 01-08-2015 06:01 AM

Tablesaw makes a lot of sense. We only just got ours. A month ago we were trying to cut angles for octagons on our bandsaw. Anything has to better than that approach. The bits came with no instructions. We did do the math to come up with a height adjustment for the bit. Still setting the fence by eye/trial and error. We came up with the height to the notch to be .5 the board thickness for 6 sided and .293 for 8 sided. As the video we found said you have to leave a very small top non angled piece of the board or it will not go well when it hits the trailing fence. Found that out the hard way.

-- father son woodworks

View shipwright's profile

shipwright

7164 posts in 2258 days


#4 posted 01-08-2015 11:25 PM

Set the TS for 180 divided by the number of sides you want. Run the boards through flat. Reset the height and fence if necessary and then run them through on edge. ...... Done
A bungee cord makes a great clamp.
You do need to leave that little flat for the edge cut to run on though.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View haskins's profile

haskins

124 posts in 698 days


#5 posted 01-09-2015 05:21 AM

Thanks for the measurement detail, shipwright. That is pretty simple. Really learning a lot here.

-- father son woodworks

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