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Compound Angles for Box Sides

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Forum topic by FlWoodRat posted 2354 days ago 4026 views 1 time favorited 7 replies Add to Favorites Watch
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FlWoodRat

732 posts in 2514 days


2354 days ago

Topic tags/keywords: question tablesaw

Hello fellow LJ’s. My daughter in law asked me to build her a trapzoidal “cube” to keep our 10 month old grand daughter’s small toys in. I am looking for suggestions on Side Angles (Slope from horizontal) and table saw blade angle and corresponding Miter angle. The box is limited to 18×18 x 18 at the top. Tips on technique are most welcome. Thanks. Bruce S. AKA Florida Wood Rat.

-- I love the smell of sawdust in the morning....


7 replies so far

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GaryK

10262 posts in 2594 days


#1 posted 2354 days ago

Well, a square angle is 90 degrees. To make thing come out even all angles will need to total 90.

For example the standard miter is 45 degrees. Add both miters and you get 90 degrees.

If you make one 30 degrees the other must be 60 degrees.

That will work as long you are making a four sided box and opposite corners have the same angles.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

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FlWoodRat

732 posts in 2514 days


#2 posted 2354 days ago

Gary,

Thanks for the response…. I should have made my question clearer. I know that a ‘square’ box has 4 corners of 90 degrees. That’s fine as long of the sides of my box are vertical. The box she has asked for has tillted sides on all four sides, and the base is narrower than the top. Basically, it will be an 18 inch square at the top, 14 inch square at the base and be 18 inches tall. My goal is to miter the corners so that no end grain of the plywood shows. I will keep working on it.. Just dont want to produce a lot of scrap. Thanks again

-- I love the smell of sawdust in the morning....

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GaryK

10262 posts in 2594 days


#3 posted 2354 days ago

That would be a compound miter cut.

Your blade would be set to 45 degrees and your miter gauge should be set at about 84 degrees.
83.66 degrees is the actual number so I just rounded it up.

Make a very small example to make sure that your angles are correct.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

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FlWoodRat

732 posts in 2514 days


#4 posted 2354 days ago

Thanks Gary… btw, I have enjoyed looking at your projects.

-- I love the smell of sawdust in the morning....

View Ampeater's profile

Ampeater

390 posts in 2353 days


#5 posted 2353 days ago

Try this site.

http://www.betterwoodworking.com/compound_miter.htm

-- "A goal without a plan is a wish."

View Tim Pursell's profile

Tim Pursell

494 posts in 2388 days


#6 posted 2353 days ago

Ampeater, I like that chart! I printed it out & it’s going in my shop file. I was going to sugest drawing up the plan is Sketch Up and use the protractor to figure the angles, but your way is simpler.

————————————————————- K.I.S.S.————————————————

-- http://www.etsy.com/shop/tpursell?ref=si_shop

View gene's profile

gene

2184 posts in 2489 days


#7 posted 2352 days ago

See if this free download will help you? It is not used just for crown molding.
http://www.perfectcuts.com/index.asp
God bless

-- Gene, a Christian in Virginia

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