Does anyone know the formula for figuring out the bevel angle on a sloped miter (eg. crown moulding) as a function of both the slope angle and the miter angle? I’m pretty sure I’ve got it for the case where the miter is 90 degrees (or 45 if you prefer) but not sure otherwise.
Thanks
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Try this site? I haven't been there for a while but I got all kinds of Math from it.
I don't know if it's still active, but I'm going to see after I send it to you.
Josephfusco.org
Yea that's the place, go to articles and then go to crown molding. At the end of the article is a angle guide and a calculator.
Edited 7/3/2006 7:15 pm by ClaysWorld
Visited site, formula's exactly what I was looking for. Thanks
The accompanying chart was useful also.
This Square Tail Fascia Calculator will also solve crown molding angles.
Diagrams, Formulas and how to enter values in the calculator.
The above works where the crown molding follows the plane of a wall or ceiling. If your crown negotiates a turn and follows a slope (for example, a vaulted ceiling) the equations get a little more complicated. I have a Javascript calculator that will crunch the numbers for a transition piece but it's still under construction. (It does return the miter and bevel angles and if you really need it I can post a link).
Joe Bartok
Edited 7/5/2006 1:07 pm ET by JoeBartok
Thanks Joe, great site, I'm going to have a better look around when I have more time. I'm not acutally doing crown moulding, we're building some tapered columns for an Arts & Crafts porch front which is a similar situation.
Thanks again
Jeff
Lets example a 12/12 roof pitch..you need cornice or crown.
You are aware that 1/2 of that 90 is 45 but yer crown is "sprung " at 38 ...I am on my LT cannot do the degree thingy.
So for a top miter set the saw at 1/2 of the spring angle ( 17.5) and the rake is still 45..so leave the fat on the cut ...not a cope type slice...clear as mud?
The spring angle is mostly 38, some bed mouldings are 45..
I cut the old way even with a compound slider, upside down and back wards...the same way I teach.
Spheramid Enterprises Architectural Woodworks
There is no cure for stupid. R. White.
"upside down and back"
It's the way I see the world and the only way to OZ.
If you're able to visualize it done on the saw table and fence, the cutting will only be an inconvenient process.
See something complete before it's begun.
"Live backwards."
Merlin
Man we gotta talk...I like that.
Spheramid Enterprises Architectural Woodworks
There is no cure for stupid. R. White.
While your at it build one of these jigs. They are prettty nice.
http://www.taunton.com/finehomebuilding/pages/hvt034.asp
All the girlies say that I'm really kind of fly for a white guy. Uh huh, uh huh.