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How to achieve large angles on a Miter Saw

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Forum topic by Bradley Mitchell posted 08-10-2012 11:56 AM 5200 views 1 time favorited 11 replies Add to Favorites Watch
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Bradley Mitchell

5 posts in 1448 days


08-10-2012 11:56 AM

I cannot for the life of me figure out how to achieve a 150 degree angle using a miter saw. I’m just too stupid to figure it out. Please inform the dumb.


11 replies so far

View CampD's profile

CampD

1217 posts in 2241 days


#1 posted 08-10-2012 11:59 AM

150 – 90 = ?

-- Doug...

View ksSlim's profile

ksSlim

1012 posts in 1645 days


#2 posted 08-10-2012 12:55 PM

Or 180-150=? Miter saw bed is 180 degrees side to side. Blade is normally set at 90 deg to bed.

-- Sawdust and shavings are therapeutic

View Doss's profile

Doss

779 posts in 1019 days


#3 posted 08-10-2012 03:08 PM

What shape are you trying to cut?

From how it appears mathematically (board stock completely across), you can use either 60° if your saw allow that or 30°. The saw itself will not allow 150° as a direct cutting option due to its design (would most likely interfere with the fence getting cut or the saw mount rotating into the saw base) and the impracticality of such a cut.

-- "Well, at least we can still use it as firewood... maybe." - Doss

View 404 - Not Found's profile

404 - Not Found

2544 posts in 1724 days


#4 posted 08-10-2012 03:12 PM

Look at Rembo’s project, he made a great jig for this type of cut. You have to turn the piece perpendicular to the fence.
http://lumberjocks.com/projects/59225

View a1Jim's profile

a1Jim

112943 posts in 2332 days


#5 posted 08-10-2012 03:15 PM

You can do it if you set your miter up this way.
http://lumberjocks.com/projects/47426
or from that same post
http://www.sawdustmaking.com/Radial%20Arm%20Saws/radial_arm_saws.html

-- http://artisticwoodstudio.com Custom furniture

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Doss

779 posts in 1019 days


#6 posted 08-10-2012 03:30 PM

I guess I’m just having trouble visualizing what Bradley is trying to do. Here’s what I am thinking:

Are we talking about something entirely different?

-- "Well, at least we can still use it as firewood... maybe." - Doss

View Fred Hargis's profile

Fred Hargis

2058 posts in 1248 days


#7 posted 08-10-2012 03:54 PM

I’m thinking you need a right angle fence.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Bradley Mitchell's profile

Bradley Mitchell

5 posts in 1448 days


#8 posted 08-10-2012 08:21 PM

Thanks for the replies. Here is what I’m building: http://www.appropedia.org/Hexayurt_H13_Plywood

And here is a picture of the angled blocks:

It looks like I’d need to set my saw to 30 degrees to achieve the 150 degree block. But this is a bit confusing because I also need to create several blocks at 120 degrees. I thought to achieve this, I’d need to do this: 120-90=30. So if I set my saw at 30 for a 150 angle block, what should I set it at to get 120?

So confusing.

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Doss

779 posts in 1019 days


#9 posted 08-10-2012 09:11 PM

Let me know if this is confusing:

When I say flip over, I mean literally flip it over (not rotate).

-- "Well, at least we can still use it as firewood... maybe." - Doss

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Bradley Mitchell

5 posts in 1448 days


#10 posted 08-10-2012 09:29 PM

Yes that helps a great deal. Thank you so much and my apologies for my ignorance.

View Doss's profile

Doss

779 posts in 1019 days


#11 posted 08-10-2012 09:57 PM

It’s not a problem. Hopefully you can read that image. From the looks of it that is what you were trying to accomplish right?

The center is the 150° angle. Yellow = 30°. And Orange (though it looks like red… there should be one right next to each yellow) is 60°.

The difference on the 120° is the Yellow is now 15° and the Orange is 75°. That give you 120° in the middle.

-- "Well, at least we can still use it as firewood... maybe." - Doss

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