Crown Molding Angle Question - Carpentry - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Crown molding angle question
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

07-07-2012, 07:31 PM   #1
Member

Join Date: Jan 2012
Posts: 110
Rewards Points: 85

## 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

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!

-Dave

Last edited by Lavid2002; 07-07-2012 at 07:33 PM.

07-07-2012, 08:30 PM   #2
DIY staff

Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 25,728
Rewards Points: 7,174

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?

__________________

07-07-2012, 08:56 PM   #3
Member

Join Date: Jan 2012
Posts: 110
Rewards Points: 85

Quote:
 Originally Posted by oh'mike 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

Lol

-Dave

 07-07-2012, 10:20 PM #4 Member     Join Date: Dec 2009 Location: Near Cleveland, Ohio Posts: 1,944 Rewards Points: 1,720 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
 07-07-2012, 10:43 PM #5 Member   Join Date: Jul 2011 Posts: 1,291 Rewards Points: 1,404 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.
07-07-2012, 11:36 PM   #6
Member

Join Date: Jan 2012
Posts: 110
Rewards Points: 85

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.

 07-08-2012, 01:13 PM #7 Member     Join Date: Jan 2012 Posts: 110 Rewards Points: 85 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
 07-08-2012, 04:43 PM #8 Member   Join Date: Jul 2011 Posts: 1,291 Rewards Points: 1,404 Upside down and backwards is correct. Though it wasn't constructive last time I said it.
 07-08-2012, 04:51 PM #9 DIY staff   Join Date: Sep 2009 Location: Kane county,Illinois Posts: 25,728 Rewards Points: 7,174 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. __________________ New members: Adding your location to your profile helps in many ways.--M--
07-08-2012, 05:24 PM   #10
Member

Join Date: Jan 2012
Posts: 110
Rewards Points: 85

Quote:
 Originally Posted by oh'mike 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

 07-08-2012, 05:38 PM #11 Member   Join Date: Apr 2012 Location: NJ (South) Posts: 148 Rewards Points: 75 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.
 07-08-2012, 05:42 PM #12 DIY staff   Join Date: Sep 2009 Location: Kane county,Illinois Posts: 25,728 Rewards Points: 7,174 Right---try this for making your test cuts---take the angle with your adjustable angle tool-- use that to cut a sheet of paper to match--- Fold that paper in half-- That is your miter angle. 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. __________________ New members: Adding your location to your profile helps in many ways.--M--
 The Following User Says Thank You to oh'mike For This Useful Post: mae-ling (07-08-2012)
 07-22-2012, 11:19 AM #13 DIY staff   Join Date: Sep 2009 Location: Kane county,Illinois Posts: 25,728 Rewards Points: 7,174 How about an update? Tough first job--- __________________ New members: Adding your location to your profile helps in many ways.--M--
 07-26-2012, 12:17 PM #14 Newbie   Join Date: Dec 2011 Location: United States Of America Posts: 5 Rewards Points: 10 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!
07-26-2012, 03:38 PM   #15
Member

Join Date: Mar 2011
Location: Ohio
Posts: 1,646
Rewards Points: 1,000

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.

 The Following User Says Thank You to DannyT For This Useful Post: <*(((>< (07-26-2012)

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post hollyjo213 Kitchen & Bath Remodeling 2 10-02-2009 01:56 PM My_attempt Carpentry 20 07-22-2009 11:52 AM ponch37300 Carpentry 15 06-05-2009 03:35 PM remodelingagain Interior Decorating 3 06-06-2008 02:16 PM spyder9176 Carpentry 11 03-02-2008 10:58 AM

Top of Page | View New Posts