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New This Old House has an article on it.
[link|http://www.thisoldhouse.com/toh/knowhow/handbook/article/0,16417,1016651,00.html|Here] (you need to be a subscriber):

Installing crown molding, however, is a task that strikes fear in the heart of every amateur carpenter \ufffd and even some pros. Because it sits at an angle on the wall, each joint is made of compound angles. Getting it right requires a lot of patience, an aptitude for spatial relations, and a few tricks from an experienced pro.

[...]

He [Tom Sliva] also doesn't lay the molding flat to cut it. Cutting crown flat, though it might seem easier, requires a saw that lets you tilt the blade (for the bevel) and rotate it (for the miter angle). You also need a set of tables to know the correct angles for the cuts.

Instead, Tom uses a simple power miter saw and arranges the material so it sits against the saw fence at the same angle it will be nailed to the wall. Although the molding has to be upside down in this method, a simple downward cut of the blade set at 45 degrees produces the perfect miter and bevel at once, as you'll see.

[...]

Inside corners are composed of a square-cut piece that butts the corner, and a corresponding piece that\ufffds cut on an angle and coped (carefully cut along the molding\ufffds profile) to conform to the first piece.

[...]

* Highlight the very edge of the cut, along the profiled front of the molding, with a pencil.
* Next, using a coping saw, cut away the bevel. Angle the coping saw blade toward the rear about 5 degrees \ufffd a technique known as back beveling \ufffd and carefully follow the molding profile as you cut (above). Use the miter saw table to brace the workpiece when cutting.


It's not for the faint-of-heart. There are types of crown molding that don't require complicated cuts, they use various box elements to ease some of the installation to eliminate the coping, etc. Lowes and Home Depot carry the things. But they're not cheap either.

HTH a bit.

Cheers,
Scott.
New Thanks to both of you
I'm working with inside corners only. Your info helped.
And when all else fails, whip out the spackling paste. Hope I can avoid using it, though.
"I think animal testing is a terrible idea; they get all nervous and give the wrong answers."
     What is the correct way to install crown molding? - (bionerd) - (61)
         It is all about.... - (folkert) - (6)
             Ah, so that's what a coping saw is for. - (Andrew Grygus) - (5)
                 That and little candle light never hurts... - (bionerd) - (4)
                     Nah, Andrew will use the charcoal-fired cooker - (drewk) - (3)
                         Her wide eyes inspired the giant portholes, I'll bet. ;-) -NT - (Another Scott) - (1)
                             Some have been awed by my use of a butane blowtorch . . . - (Andrew Grygus)
                         Can't do - the lamps hang too low over the table - (Andrew Grygus)
         This Old House has an article on it. - (Another Scott) - (1)
             Thanks to both of you - (bionerd)
         Find a carpenter and ply him with ... something - (drewk) - (43)
             Barter system difficult in my line of work - (bionerd) - (42)
                 That plan may be workable but... - (ben_tilly) - (40)
                     So I talk to my neighbor Jimmy.. - (bionerd) - (39)
                         Heh -NT - (ben_tilly)
                         This one has Pep! and Bite! - (folkert) - (36)
                             Can anyone cart her off to Beeps? Please? -NT - (ben_tilly) - (34)
                                 The wagon train goes right past her place. -NT - (admin) - (1)
                                     Does she play dimes? -NT - (drewk)
                                 Why dont you asked her if she is inclined to be carted off? -NT - (bionerd) - (31)
                                     Basically... - (folkert)
                                     Good question - (ben_tilly) - (29)
                                         Thank you for the lovely invitation - (bionerd) - (28)
                                             No problem - (ben_tilly) - (27)
                                                 :-( -NT - (imric)
                                                 How could you possibly miss - (broomberg) - (25)
                                                     A what? -NT - (folkert) - (1)
                                                         You just become illiterate? -NT - (broomberg)
                                                     Quarters or GTA-SA or ...? -NT - (Another Scott) - (5)
                                                         Outlook vs GW -NT - (broomberg) - (4)
                                                             In the Cage of Death? -NT - (Another Scott) - (2)
                                                                 WITH LARGE FOAM BATS! - (admin) - (1)
                                                                     :-) -NT - (Another Scott)
                                                             Size 13 steelies vs sweaty, hairy man-boobs -NT - (drewk)
                                                     Certainly not by choice! - (ben_tilly) - (16)
                                                         Whoa!!!!! - (broomberg) - (9)
                                                             Wait... - (FuManChu)
                                                             Zing! -NT - (pwhysall)
                                                             True, true - (ben_tilly) - (6)
                                                                 Hate to say 'I told you so', but ... - (drewk) - (1)
                                                                     I'm still insistent that there is a choice - (ben_tilly)
                                                                 Perfectly good choice - (broomberg) - (3)
                                                                     Some points that you're missing - (ben_tilly) - (2)
                                                                         Cross country? - (broomberg) - (1)
                                                                             Depends on where my wife gets a residency - (ben_tilly)
                                                         bring the kid -NT - (boxley) - (5)
                                                             Not without my wife... - (ben_tilly) - (4)
                                                                 Bad option anyway - (broomberg) - (2)
                                                                     Yeah - (bionerd)
                                                                     Too late - (ben_tilly)
                                                                 link, portable food supply - (boxley)
                             I was reminded of Hannibal Lector when I read that - (bionerd)
                         What they're trying to do (new thread) - (tuberculosis)
                 Molding first, booze after</mad hatter> -NT - (drewk)
         Measure once, cut twice -NT - (tuberculosis) - (2)
             Oh *at least* twice ... if you're good you can get 3 or 4 -NT - (drewk) - (1)
                 Quick, run to Home Depot and buy me a board stretcher -NT - (FuManChu)
         Crown molding? - (pwhysall) - (2)
             Wooden trim at the top of the wall -NT - (drewk) - (1)
                 Ah. - (pwhysall)
         Best way? Pay a professional. - (Silverlock) - (1)
             That's cheating. - (Andrew Grygus)

I knew it as soon as you told me.
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