Hello. I’m having issues with coping my crown molding. Here are the specs of the crown.
5 1\2 in crown 40/50 for wall/ceiling angles
My miter saw isn’t big enough to only use the miter function so I will have to use the bevel function as well. All the charts online show for 38/52 or 45/45 and nothing to show how those miter/bevel angles are calculated. Does anyone here know the miter/bevel angles for 40/50 crown?
The specs above are from the manufacturer.
Replies
Hello ColletteK! Glad to hear you're using crown molding. When we install crown trim on our 12" DeWalt miter saw, we use "Crown Stops". It's an attachment that allows you to position the trim on the saw against the fence and the table, upside down from the way it will be installed and the adjustable stops hold the crown in position (at a 45 degree angle) and this then allows a smaller saw the make the correct cut without the compound bevel. I have also seen guys hold the trim against the fence and table and scribe a pencil line on the table and either just hold the piece there or clamp a scrap for a crown stop. Crown molding can be a head-scratcher to install but is beautiful when complete. I don't know the brand of your saw but you might do a search for crown stops. I know Bosch makes crown stops as well as DeWalt....or make your own. They make life much easier and the cuts more accurate. Good luck and have fun!
Evidently you didn’t read the problem she has as her size saw will only allow her to cut the crown on the flat.
Forget your spam link?
Take a look here first.
https://www.compoundmiter.com/help/Crown_Spring_Angle.pdf
And you’ll come across this to be linked to.
http://www.compoundmiter.com/extratables/
Here’s another shot at figuring this out.
https://www.blocklayer.com/crown-molding
The simple answer, with just that bit of difference in the spring angle, minutely alter your settings on the saw and fudge your way to the perfect fit…….
Hey Calvin,
Thanks for the reply and information, I believe I have the correct angles and settings now. Using my angle finder, the crown sits at 140 degrees which gives me a spring angle of 50, a slope angle of 40 degrees, which in the table should mean a miter of 32.7 degrees and a bevel of 32.8 degrees. Does that sound correct?
At a 50 spring angle, that’s what I get.
Remember, fit is important and no wall ceiling is perfect. Rolling trim at the point of connection and fine adjustment and glue is the way to keep it nice.
There’s a boatload of tricks and technique, some you’ll figure out yourself. If it’s painted, a bit more leeway……
Never back up and be safe.
Edit. Google Gary Katz for some fine print and pictures on trim technique. “This is carpentry.com” is a good read.
Does it make a difference when they are being coped instead of jointed? Tried the angles and not even close. Fairly large gapping at the top.
Well, the only difference in the coped joint “should be” the backside. Removing the material allows a bit more wiggle room on fit.
Let us understand how your numbers jive with the fit. Using your numbers, how’s the outside corner fit (if there is an os corner in the room) ? Cut OS mitres using your numbers and do they fit real good on a 90 O.S. corner? If not, then the degrees you are using are not right.
Adj the numbers and cut till that 90 degree OS corner is sweet.
Now you should have the right numbers.
Do all this with 1’ or so scrap.
I hope you don’t send me out to the shop, roll out the saw and hunt for some big crown scrap.
.this flips your spring angle"……………
Collette,
So, after confusing you, how’d it go with the crown?
Went out and dragged this mock-up out of the historical job file (pile)
It sits at a 45 to the wall and is 5-1/4” stock.
The writing was my angle/bevels cut on the flat.
Maybe?
Many years ago I bought this tool.
https://www.boschtools.com/us/en/boschtools-ocs/digital-levels-digital-angle-finders-and-inclinometer-gam-220-mf-140453-p/
Besides giving me the proper spring angle mitre settings (8” mitre saw) I found several other uses for it.
If you’re still having trouble with the settings let me know.
Highly recommend watching Gary Katz crown videos. They are free on YouTube. They answer a lot of questions about crown. https://m.youtube.com/watch?v=ls-mRYtsjsA