How to mark a compound miter

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Forum topic by RobH posted 05-08-2009 01:54 AM 1350 views 0 times favorited 3 replies Add to Favorites Watch
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465 posts in 4905 days

05-08-2009 01:54 AM

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 Hix, King George, VA

3 replies so far

View sandhill's profile


2128 posts in 4780 days

#1 posted 05-08-2009 02:19 AM

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

View a1Jim's profile


118136 posts in 4433 days

#2 posted 05-08-2009 05:53 AM

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


View TopamaxSurvivor's profile


19576 posts in 4532 days

#3 posted 05-08-2009 07:33 AM

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 :-))

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

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