Originally Posted by allthumbs
sigh... and what happens when the pieces you cut using these settings don't meet up very well ??
The first corner I am trying to do is 91 degrees... if have gone to a bunch of different sites and charts etc.. and have seen 4 or 5 different miter and bevel numbers for my mouldings spring angle... (52)
i guess my question would be... how the heck does someone just do crown with a miter box?? wouldn't they end up with a bunch of perfect corners on walls that are not perfect??
this is really confusing me!
Corners are rarely 'tru' 45 degrees inside or outside. That is why baseboard and crown is generally 'coped' cut on inside corners....
On outside corners:
When installing any kind of trim, especially crown molding, you may have to do some 'test' cuts because each corner might be a little 'off due to plaster or drywall compound 'build-up'.
(We had one guy that worked for us doing taping). He did a good job except that, he would do his inside corners with a plastering corner tool instead of a taping knife and 'wreck' all the inside corners. They would get built up to 'not even being close' to a 45 degree.)
A test cut can be done using a scrap piece of crown molding (BTW- if doing crown molding for the 1st time...Make sure that you buy ALOT of extra length)
Each test cut piece should be a minimum of 1' in length. Use the degree guide as a starting point. Use the TWO opposing degree.... 'test cut lengths' to check a corner when you get to it. If it is slightly 'off' - try to figure out if it's more or less that have to be adjusted. Cut TWO at the adjusted lengths and then put them up to the corner to see if you got it right. Do this until you get the degree measurements right. make sure that you MARK or WRITE what the degrees are on the back of the test cut pieces when you do get it right. Put those test cut's aside and use them when you come to a corner that is 'slightly off'. Hold them up and check....and re-adjust your saw to compensate. When you get it right, then do your cuts on the full length pieces.
You will be flying along like a PRO...before you know it...