How do you miter a corner that is 144 degrees?

beewill

I am driving my self nuts trying to figure out how to miter a corner that is 144 degrees. Since my saw does not go to the 72 degrees needed what do I need to do? Thank you in advance for any tips.

BigJim

Cut you a long 27° wedge and set your saw on a 45° lay your trim against the long angle and there you go. Be sure to hold the board very tight and be safe.

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Jim

oberkc

Without knowing the tools available to you, my first inclination would be to fabricate an 18 degree wedge and place it against the fence of a miter saw. Set the saw at 90 degrees, place the wedge between the fence and workpiece, and cut.

BigJim

Yep, that will work also.

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Jim

WirelessG

Strike a line and use your circular saw.

akilez

And make sure you have plenty of money to spend when the cuts you make are "just a bit off" LOL

WirelessG

If you know what you are doing your cuts don't end up "just a bit off".

akilez

Wow, I never meant that as an attack. So my suggestion is if you are that confident in your cutting, why let a simple caveat like mine throw you into such a tizzy?

My apologies once again if I offended some sensibilities I was otherwise unaware of.

WirelessG

You didn't throw me into a tizzy, nor did you offend my sensibilities. You simply made an ignorant statement and you continued with your last statement.

akilez

You are absolutly right. Thanks for pointing it out.

hrjrkr

I would like to chime in here. I'm not Norm Abrams but I would like to see a perfect cut done with a circular saw that would be better than a chop saw.

tpolk

hold piece at 90 to rail set saw to 36 or it may be 8 dont have saw in front of me

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DrHicks

I know I've never done it. I just built a hearth, mantel, bookshelves and installed all the trim in a new room. It would have been virtually impossible to do without my 12" compound miter slide DeWalt.

Of course, there are a LOT of people who are a lot better than I am.

DrHicks

I'm probably missing something here, so please pardon my probable error and general ignorance...

When you're talking about a 144 degree angle, you're speaking of one like this sketch, right?



Why couldn't you set your miter saw at 54 degrees and back-cut it?

Augie Dog

Pictures are worth a thousand words.

This angle measures 53 degs when measured with a Swanson Speed Square. That could be considered 127 degs but not normally the way it is called in the carpentry world.



Here is the trick;

Take the 53 and subtract it from 90. That leaves 37. Divide that by 2 and you have the magic number for the fixture angle of 18 1/2 degs.

Cut a fence block at your 18 1/2 and move the saw back to 90. Clamp it down and nibble a little of the long point off. That will be handy for a couple things, one is it gives you the exact location of the cut line to line up a mark on your work piece if you are cutting it to finished length with this cut.



Find a way to hold your piece down safely against the fence and cut.



You may need to make a slight adjustment to get a great fit. But that is one way to get it done.