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How to mark a compound miter

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Forum topic by RobH posted 1937 days ago 766 views 0 times favorited 3 replies Add to Favorites Watch
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RobH

465 posts in 2681 days


1937 days ago

Hey all,

I have finally put up the swing bar on the boys’ playground in the back yard, and I want to put in a couple of braces between the 4×6 beam and the 4×4 supports. I plan on laying the support board flat on the 4×4 support and running it at an angle up to the 4×6 beam. This, of course, will result in a compound angle at the beam. Since I am not sure of the angles the supports make with the beam or the angle at which I will be sloping the support up to the beam, I cannot mathematically figure out the compound angle. Does anyone know how to mark out the compound miter one the swing set? If I can figure this out I will mark it out and then cut to the layout lines.

Thanks again for the help,
Rob

-- -- Rob Hix, King George, VA


3 replies so far

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sandhill

2118 posts in 2555 days


#1 posted 1937 days ago

Sounds like 22 degrees? Then 0 – ~ from the 90 degree verticals

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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a1Jim

112014 posts in 2208 days


#2 posted 1937 days ago

Hey Rob
I can’t figure out why you need a compound angle instead of just an angle on each end

-- http://artisticwoodstudio.com Custom furniture

View TopamaxSurvivor's profile (online now)

TopamaxSurvivor

14724 posts in 2307 days


#3 posted 1937 days ago

If the brace can’t be marked as DaveR suggests, you could stretch a string along where one edge of the beam will be. Use a framing square to do your layout of the angles. Once you have one side of the square on the line, you read where it tounchs in inches and fractions. layout one angle, then the other and follow it around the beam. Repeat for the other end. Easier than it sounds :-))

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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