Crown moulding horror

[tech999]

I installed a new kitchen in my house and the only problem I have is putting the crown moulding on top of the cabinets
It is a 45 degree corner and the sping angle is 47 degrees
If you look at the picture it is a weird shaped crown moulding

[roger g]

Most crowm mouldings are not equal angles. I think they are usually 38 degrees and 52 degrees or something like that. Why that is so I haven;t a clue.

roger

[tech999]

I used that calculator and here is what I got
Mitre angle =60.47
bevel angle = 39.06
Angle from level = 50.94

What does angle from level mean?

[Tom R]

Let's see, guys, - - most (99%) crown moldings come in one of two configurations, - - 45/45 or 38/52 (more common), - - as you can see, no matter what the 'angle combination', - - they will always add up to 90 degrees ('opposing' angles), - - so, rog, the 38 and 52's you are hearing about are actually one and the same crown, - - usually crown is simply referred to as either 38 (38/52) or 45 (45/45).

Tech, - - I'll venture to say your's is probably supposed to be 45, and it's probably a little off (though I don't know what you're measuring the angle with). If it is 47, then by all means, - - go with the corresponding bevel and miter cuts.

Oh, and I don't know what 'angle from level' means either, - - maybe Rich or Dragon can help?

[Cole]

And why not me???? :roll:

[Tom R]

Tech, - - I just checked out the 'calculator', - - and I don't know what numbers you put in, but with a spring angle of 47, - - and a wall angle of 90, - - you'd have a miter of 36.18, - - and a bevel of 28.83.

And I still don't know what 'angle from level' is or why you would need it.

[Tom R]

Sorry, Cole, - - guess I took for granted you were down in your basement puttin' that BOM together! :twisted:

[Dragon]

:lol:

[tech999]

Tech, - - I just checked out the 'calculator', - - and I don't know what numbers you put in, but keep in mind your 'spring' angle is not 47, - - it's 43 (though 47 is the angle from your wall, your 'opposing' angle, - - the one from your ceiling would be 43, - - translated as the spring angle).

Now, if you enter spring angle of 43, and wall angle of 90 (I'm taking for granted), you're miter would be 34.29, - - and your bevel would be 31.14.

And I still don't know what 'angle from level' is or why you would need it.

If you look at the picture it is a wierd moulding.I used an angle finder to get the angle of the moulding.I have to put up 2 inside 45 degree corners and 2 outside 45 degree corners as well as 1 90 degree corner.

[Dragon]

If your saw has a fence high enough then roll that crown up on it and make your cuts at 22.5 and 45 degrees.

Forget bevel, spring angle, and everything else.

I'm going to have to upload those pictures again aren't I...

[tech999]

If your saw has a fence high enough then roll that crown up on it and make your cuts at 22.5 and 45 degrees.

Forget bevel, spring angle, and everything else.

I'm going to have to upload those pictures again aren't I...

I tried that and the angle did not line up

[Dragon]

You cut it like this?

http://members.cox.net/dfh.construction/mitersaw/saw1.jpg

http://members.cox.net/dfh.construction/mitersaw/saw2.jpg

Note that the crown is upside down and the part that hits the wall, or cabinet in your case is perpendicular to the fence..

To cut for a 90 degree corner simply set the saw on 45 degrees.

If it doesn't work then your corner is not a 90 degree corner.

Or you aren't keeping the crown in the same location. when you make your cuts. If you let one roll more than the other it will throw the angles off.

[Tom R]

Sorry, Tech, I didn't have that much time to check out your picture last night, - - that's like a combination crown/nailer. Best bet is set it in your miter saw just like it's drawn in your picture (as if we're looking directly at the left side of your saw, and hold the piece with the nailer flat, just as pictured), - - for 45 corners, set the saw angle at 22 1/2, - - for 90's, set the saw angle at 45, - - no bevels for either.
The bevel and miter settings of the calculator, although correct, - - won't work for this particular molding, as the 'nailer' won't let the crown lie on your saw table correctly.
The left hand piece of your corner would get cut on the right end of the piece (with your saw set to the left for an inside corner, or to the right for an outside corner), and the right hand piece of your corner would get cut on the left end (with your saw set to the right for an inside corner, or to the left for an outside corner), - - if you're coping you would only cut one or the other (consistent) of each corner.

[tech999]

I tried that but the one edge would not line up if you look at the current picture the arrow is pointing to the edge that wouldnt line up

[Tom R]

'Theoretically', - - it should line up perfect, - - if it doesn't there could be several reasons, - -

- your saw is 'off'

- your cabinets aren't at an exact 45 or 90

- saw blade overheating, causing 'wobble'

- saw blade has 'runout' (play in arbor)

- you're not using a 'hold-down' clamp (to keep work still)

- you're starting your cut before saw is 'up' to speed


Do note that your 'discrepancy' is right at the beginning of your cut. Try these simple steps while cutting (I'm taking for granted your angle settings are correct), - -

- use a hold-down clamp to make sure work can't 'slide'

- use a 'beveled' 2 X 4 to help you hold the front 'face' from deflecting

- make sure saw develops 'full-torque' before starting cut

- 'down-cut' only, then slide piece away from blade

- cut 'slow' enough to let the blade do the work

- cut 'fast' enough so the cut doesn't 'burn'

- cut 'over-sized' by 1/32", then re-cut (relieves blade resistance)

[Tom R]

Also, try simply setting your angle a little differently, - - for instance, if the area you are pointing to in your picture is 'open' (gapped) on an inside corner, change your setting to 44 for a 90, or 22 for a 45, - - if it's 'open' on an outside corner, change your setting to 46 for a 90, 23 for a 45.

[Dragon]

Check the bevel and miter on your saw with a square. Make sure that 0 is actually 0.

[ZeeMullet]

I never figured out a system to use with the online crown molding calculators. Is it bring home you corner angles and spring angles, go online for the answers, and bring them to work the next day?
Or the tool that holds no memory of the spring angle the Bosch DWM40L. Lets just reset the spring angle for each corner prior to climbing the ladder each time.
Or the idea of teaching the help trigonometry, that’s really going to work!
{To find the miter angle: 1) The wall angle divided by 2= 2) press tan. (answer will be X ) 3) X times 5.5= Y 4) 3.88 divided by Y = 5) press inv. tan.} haven’t even gotten to the bevel yet}!!!
Craftsman, I’ve taken the situation into my own hands and wrote a book to carry with you on the jobsite.

www.Compound-Miter-the-bevel-and-miter-answer-book.com

All the answers to cutting compound miters, using any inside corner or outside corner angle with any spring angle.
Using any corner angle with any spring angle in increments of 1° (1° thru 360° of corner angles & 1° thru 90° of spring angles)
Designed around a simple formula: (inside corner or outside corner with spring angle) = (bevel and miter angle answers).
Charts for finding the answers to any input value of the formula (inside corner angles, outside corner angles, and spring angles).
Working charts for cutting compound miters or crown moldings using either a single bevel miter saw or double bevel miter saw.
Working charts use six easy steps from placing the material on the saw, setting the miter and bevel angles, to which piece to save.
Charts finding the spring angles to square-cut rafters for cutting fascia board as compound miters (input value to the formula).
High speed search for answers using a quick tab system locating inside corners, outside corners, and spring angles by page flipping
Please give me your opinion on what I’ve accomplished in the last three years Thanks

[montytx]

Also cut some small pieces to work the fit. You may need a 45 on oneside and a 44 on the other. I good idea is to cut a set at 44,45,46. THen see what works best. Corners are rarely square.

[Dragon]

If you'll use the Bosch you don't have to do that. It will give you the correct angle.

And cut to the nearest 1/4 degree.