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Here’s one that stumped me for a bit this week.
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I was installing solid crown around an outside corner over the top fascia board. I had to make a 45* turn around the eve and up a 7/10 rake.
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After turning a couple of feet of this solid crown in to saw dust I finally came up with the right combination of angels.
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Eve 47 – ½*
Rake 47 – ½* / 24*
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Now I was a pretty good geometry student, but I can’t figure this one out and I hope I don’t have to.
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Has anyone out there come across some sort of chart for such a thing?
Replies
Normally the crown has to be a different profile to do that, I.e., two different profiles, or a short transition piece has to happen in there.
Sometimes it is easier to run the rake wild and carve it to match the face of the level run at the miter ( cheating, but it works)
Spheramid Enterprises Architectural Woodworks
"If you want something you've never had, do something you've never done"
I just play with the angles until it's as close as it can get and then round over any places that don't line up perfectly with a file.
Sure, that works fine and it's more or less what I did, but the angels I found worked in all the other spots I had the same thing.
The profiles matched perfect with the right combo.
So I'm thinking someone smarter than I already did the math and but together some sort of multiplication chart for this. Like an X,Y,Z sort of thing.
If :
x= 45*
y= 35*
set x and y = 47.5 * and make z = 24* (or whatever it may have been(it was a couple of days ago))
Ya know. Make a cheat sheet to keep handy and really dazzle the costumer.
Edited 10/6/2007 5:04 pm ET by builderhayes
Here's a link to a page I did some years back (like 6 or 7) that deals with this issue.http://www.josephfusco.org/Articles/Crown_Moulding/rakecrown.htmlIt's a bit of a hard read but works and can give you a bit of insight as to how the crowns relate to each other.http://www.josephfusco.org
http://joes-stuff1960.blogspot.com/
Joe,
I’ve spent the past hour or so looking over your site, and wow! I’m really starting to regret ever saying "I’ll never use this stuff" after calc class.
So, I’m starting to get a grasp on the whole compound / bevel thing , but now I have another question.
How do you deal with matching the detail as far as tooling goes?
If you’re working on a project with such corners, do you figure out the angels ahead of time a get custom knives made to mill your own molding? Or are there blades out there that can be shimmed?
It almost seems one could cut the same profile and alter the thickness of the stock behind it.
Builderhayes,Sometimes you get lucky and the profiles are the same and are incremented in sizes like 2-1/2" 3' and 3-1/2" and you can make it work. Most times it’s a matter of doing all the calculations first, picking a profile and then scaling it to produce the two sizes needed. This can become expensive since you will most likely have to have the cutters made for at least one profile.There is an alternative method of finding similar or like profiles of different sizes and using them as they come. When applying them you can roll them to get the best fit. Sometimes this approach works quite well, but it’s a true carpenters job of fit and finish.http://www.josephfusco.org
http://joes-stuff1960.blogspot.com/
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“The Hand of providence has been so conspicuous in all this, that he must be worse than an infidel that lacks faith, and more than wicked, that has not gratitude enough to acknowledge his obligations.” —George Washington
If you need a crown calculator :http://www.josephfusco.org/Articles/Crown_Moulding/crownscript.htmlIf you need a crown chart: http://www.josephfusco.org/Articles/Crown_Moulding/CrownChart.htmlIf you need a box cutter: http://www.josephfusco.org/Calculators/Advanced_Box_Cutter.htmlHey if you need a roof calculator:http://www.josephfusco.org/Calculators/Simple%20Roof%20Calculator.htmlThere all for free as well. . . http://www.josephfusco.org
http://joes-stuff1960.blogspot.com/
Thanks for the links.
The use of a third piece never occurred to me when making a beveled inside miter. Also I think the calc. will be useful for me in the future to figure out angels that aren't 45*. Hitachi already did the thinking for me on that one.
Useful info. It's good to find time saving avenues like this because during the work day one really does't have the time for math equations.
I use the cheat sheet that came with my Dewalt 12" scms
“The Hand of providence has been so conspicuous in all this, that he must be worse than an infidel that lacks faith, and more than wicked, that has not gratitude enough to acknowledge his obligations.” —George Washington