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 Lavid2002 07-07-2012 06:31 PM

Crown molding angle question

Hey guys, I am finally around to the part of my project where I hang crown molding, problem is...I've never done it before :laughing:

I have read a bunch of tutorials and watched a bunch of videos, I have made a few cuts and I can't get my angles right. I am using a tool to measure the inside angle, since I am dealing with a bunch of different angles, and I am using a block of wood to keep the crown at the proper orientation and upside down on the miter.

Can someone tell me what I'm doing wrong?
Thanks :)

Here's a pictures of the triangle shaped area I am trying to crown, and here's the corresponding angles I measured (They sum to 180 so my measuring tool and I must be close) When I tried to cut the 50* corner I cut the left side crown to 25* and the right side of the crown to 25* and together they should make 50* (My thought process, if 45*+45* makes 90 right?) nope! The two together gives me apx 130*...roughly. So my thought process is as follows, 180-50 is 130*. Do I need need to use a formula like the following? (I just made this up...it makes sense in theory to me)
(Angle measured - 180)/2 = Angle to cut for each side of the crown.

Also, if this is the formula I should be using...how in the heck can I cut these angles? Lets use my 50* angle example. 130/2 = 65*. My miter only goes 45* in each direction, and 45* on a bevel. I don't know carpentry very well but on an XYZ coordinate plane that's a variation of 45* on the XY plane, and a variance in 1 direction on the YZ plane.

Here's some pix of my setup. Point me in the right direction! :thumbup::thumbup:
http://i152.photobucket.com/albums/s...2/DSCF3156.jpg
http://i152.photobucket.com/albums/s...2/DSCF3157.jpg
http://i152.photobucket.com/albums/s...2/DSCF3158.jpg
http://i152.photobucket.com/albums/s...2/DSCF3159.jpg

-Dave

 oh'mike 07-07-2012 07:30 PM

If the picture of the cut in the miter saw is for your ceiling --
I'm confused-
that is an outside corner cut---
an inside corner cut would be longer at the top and narrower at the bottom.

What is going on in that photo?

 Lavid2002 07-07-2012 07:56 PM

Quote:
 Originally Posted by oh'mike (Post 960289) If the picture of the cut in the miter saw is for your ceiling -- I'm confused- that is an outside corner cut--- an inside corner cut would be longer at the top and narrower at the bottom. What is going on in that photo?

Ignore the photo, the crown has flipped and is showing the non-presentation side I was snapping pix so quickly I forgot to flip it :eek:

Lol

-Dave

 firehawkmph 07-07-2012 09:20 PM

Inside corner cuts are cut upside down but not backwards. So a right angle would be cut on the right side of the blade. If you were cutting outside miters, your notations on your board would be correct. I would recommend making an L shaped bed for your miter box and screw it to your fence from behind with short screws. Then fasten a small piece of wood to the base of it for your stop to hold the molding at the correct orientation. It gets the clamps out of your way and makes sure your stop doesn't move.
Mike Hawkins:)

 mikegp 07-07-2012 09:43 PM

You sure you're putting it upside down and backwards? I just did crown for the first time recently and banged through it with no problems. My corners were all pretty close to 90 degrees, but the idea transfers to any angle.

 Lavid2002 07-07-2012 10:36 PM

Quote:
 Inside corner cuts are cut upside down but not backwards. So a right angle would be cut on the right side of the blade. If you were cutting outside miters, your notations on your board would be correct. I would recommend making an L shaped bed for your miter box and screw it to your fence from behind with short screws. Then fasten a small piece of wood to the base of it for your stop to hold the molding at the correct orientation. It gets the clamps out of your way and makes sure your stop doesn't move. Mike Hawkins:)
Let me give this a shot tomorrow and see how it works :)
Thanks! I will build a box if the clamps give me any trouble at all.

Quote:
 You sure you're putting it upside down and backwards? I just did crown for the first time recently and banged through it with no problems. My corners were all pretty close to 90 degrees, but the idea transfers to any angle.
There was no constructive part of this comment.

 Lavid2002 07-08-2012 12:13 PM

Nope, I tried to cut the left side of the piece from the left side of the saw. When I put it into place the crown is upside down. Are you suggesting I cut the crown right side up in the saw? That would allow me to cut it on the left side for the left piece...

I can make a video of what I'm doing if it would help you guys understand what I'm doing.

-Dave

 mikegp 07-08-2012 03:43 PM

Upside down and backwards is correct. Though it wasn't constructive last time I said it.

 oh'mike 07-08-2012 03:51 PM

You have chosen a most difficult miter for your first crown project.

As you have 2 out of three corners that are to tight to make on your chop saw without
making a L-shaped cradle for the trim that can be clamped or fastened to the saw.

Your saw s maximum cut is 45* or so---those tight corners will require adding a wedge behind
the L-shaped cradle to achieve the numbers needed.

 Lavid2002 07-08-2012 04:24 PM

Quote:
 Originally Posted by oh'mike (Post 960961) You have chosen a most difficult miter for your first crown project. As you have 2 out of three corners that are to tight to make on your chop saw without making a L-shaped cradle for the trim that can be clamped or fastened to the saw. Your saw s maximum cut is 45* or so---those tight corners will require adding a wedge behind the L-shaped cradle to achieve the numbers needed.

Right! This makes perfect sense! I will make a box tonight, and cut a board to 25* to wedge the box to.

Thanks :)

So I am on the right track?? In theory, if I had a saw that could cut steeper angles this would be a piece 0-cake but I need to improvise right?

Thanks Mike

 pucks101 07-08-2012 04:38 PM

Just wanted to let you know, if for some reason you're not already aware, the guy (or company) who makes your angle finder has a website at http://www.compoundmiter.com/true_angle_tool.html. It's possible there's more info and/or tools from them that could help you out.

 oh'mike 07-08-2012 04:42 PM

use that to cut a sheet of paper to match---

Fold that paper in half--

Use that to set the saw--make two test blocks--

Adjust the cut for a perfect fit--use that number for left and right cuts--

You sure jumped in with both feet--good luck--those long miters really pull the board-
So support every thing well--make sure your hands are safe and
don't get pulled into the saw if the blade grabs the work on a long miter.

 oh'mike 07-22-2012 10:19 AM

Tough first job---

 cutncrown 07-26-2012 11:17 AM

Hope you have already figured out your problem! If you have not, take a look at our site http://cutncrown.com and with our jig you can call us with any specific questions on your project, our phone number is right on top of our website. Our jig makes everything simple with a quick three step process, takes minutes to learn and eliminates the entire upside down and backwards thought process. With our video showing how to cut and install crown molding, it makes our system a quick and easy way to successfully finish your project. We also have other videos on youtube that can help with more complicated cuts: http://www.youtube.com/playlist?list...0&feature=plcp

No matter what you decide on, good luck to you on the project!

 DannyT 07-26-2012 02:38 PM

for the angle you show the cut would need to be 65(180-50=130 divided by 2 = 6). the 25 would work if you had an angle of 50 from straight. your angle is 130 from straight.

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