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-   -   Miter cuts (http://www.diychatroom.com/f14/miter-cuts-4882/)

jerome8283 11-18-2006 08:22 PM

Miter cuts
 
What is the secret to achieving a perfect miter cut? I'm putting trim around a window and I'm not happy with my cuts. I have a compound miter saw but the four pieces never seem to line up around the window correctly :(

ncor 11-18-2006 11:04 PM

level and plumb

space_coyote 11-19-2006 09:58 AM

Don't trust the numbers on the saw. I line up the blade with the fence and a square for every 45 and 90 cut that I need to be precise.

mcwilson 11-19-2006 11:53 AM

To close up any gap in the face, try adjusting your compound miter box so that you "undercut" joint by about 1-2 degrees, leaving the saw set at 45 degrees. This will help the face join together before the back does, which you don't see anyway. Make sense?

If your installing casing on a door, put the head on first, then you can cut the legs a liitle too long and check your joints and make nescessary adjustments, (the legs usually end up a 1/4" to 3/8" off the subfloor. Hope this helps

mcwilson 11-19-2006 11:57 AM

Just read your question again. When trimming out a window, install the head first, then the legs leaving them long until you like the joints at the top, then the bottom. You will but the bottom just a little long so you can check each joint and adjust

Good luck

jerome8283 11-19-2006 11:59 AM

Quote:

Originally Posted by mcwilson (Post 24119)
To close up any gap in the face, try adjusting your compound miter box so that you "undercut" joint by about 1-2 degrees, leaving the saw set at 45 degrees. This will help the face join together before the back does, which you don't see anyway. Make sense?

If your installing casing on a door, put the head on first, then you can cut the legs a liitle too long and check your joints and make nescessary adjustments, (the legs usually end up a 1/4" to 3/8" off the subfloor. Hope this helps

I think this makes sense. I'm trying to locate the instruction manual for my Delta 10" Compound Miter Saw (36-075).

As far as doing doors, I'm ok. In this case it's the trim around a window.

Someone suggested that if I get the two sides cut exactly the same and the top and bottom cut exactly the same everything should fall into place?

jerome8283 11-19-2006 12:01 PM

Quote:

Originally Posted by mcwilson (Post 24122)
Just read your question again. When trimming out a window, install the head first, then the legs leaving them long until you like the joints at the top, then the bottom. You will but the bottom just a little long so you can check each joint and adjust

Good luck

oh ok, got you.

Joe Carola 11-19-2006 03:34 PM

Quote:

Originally Posted by jerome8283 (Post 24049)
What is the secret to achieving a perfect miter cut? I'm putting trim around a window and I'm not happy with my cuts. I have a compound miter saw but the four pieces never seem to line up around the window correctly :(

Is the sheetrock flush with the window jambs?

jerome8283 11-19-2006 09:58 PM

I got it to work. I cut the top piece and two sides and got them to work together and then cut the bottom piece a little longer and continued to cut it little by little until it fit perfectly.

Thanks for everyone's help!

joewho 11-21-2006 07:18 PM

If you cut the head and legs to fit, isn't there a way to lay the bottom across the legs and just mark the angles from the legs?


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