oak pedestal for table

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Forum topic by ewinger posted 07-31-2013 08:30 PM 1002 views 0 times favorited 4 replies Add to Favorites Watch
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21 posts in 1474 days

07-31-2013 08:30 PM

I will be the first to admit I am not good at geometry
My wife wants to convert a coffee table back to a dinning room table and I need to built a 8-sided pedestal to do this and I cannot come up with the angular to cut the piece to make the octagon ship come someone help

Bill Ewinger
Burlington Iowa

-- Bill ewinger

4 replies so far

View Mark Kornell's profile

Mark Kornell

1057 posts in 1948 days

#1 posted 07-31-2013 09:01 PM

An octagon has 8 sides, so 360 degrees divided by 8 = 45. Since each side of the joint uses half the angle, 45 / 2 = 22.5. So, tilt your saw blade at 22.5 degrees from vertical.

-- Mark Kornell, Kornell Wood Design

View DS's profile


2145 posts in 1838 days

#2 posted 07-31-2013 10:07 PM

Check! Mark’s got it!

22.5 degrees. A router bit can also do the trick. They make one with 22.5 degree angle just for this purpose.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View RogerInColorado's profile


321 posts in 1372 days

#3 posted 08-02-2013 05:41 AM

I’ve done exactly what you are getting ready to do. The cut down table was my Mom’s, one of my sons wanted it as a dining table. The math above is right. I’d recommend building a prototype out of MDF or plywood to make absolutely certain your angle set up is dead on and that you have a good glue up strategy. I used the packing tape method and got perfect results, but it takes a little practice with 8 sides to get the pedestal dead square.

View rrww's profile


263 posts in 1531 days

#4 posted 08-02-2013 02:14 PM

We do around 1000 octagons a year, its real easy. Make sure wood is flat / square before you start. One bad piece will throw off the whole pedestal. Get a tiltbox or wixey and your miters will be perfect. Band clamps are the way to go for clamping!

Good Luck

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