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Old 11-18-2006, 07:22 PM   #1
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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


Last edited by jerome8283; 11-18-2006 at 07:56 PM.
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Old 11-18-2006, 10:04 PM   #2
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Miter cuts


level and plumb

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Old 11-19-2006, 08:58 AM   #3
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Miter cuts


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.
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Old 11-19-2006, 10:53 AM   #4
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Miter cuts


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
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Old 11-19-2006, 10:57 AM   #5
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Miter cuts


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
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Old 11-19-2006, 10:59 AM   #6
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Miter cuts


Quote:
Originally Posted by mcwilson View Post
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?

Last edited by jerome8283; 11-19-2006 at 12:01 PM.
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Old 11-19-2006, 11:01 AM   #7
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Miter cuts


Quote:
Originally Posted by mcwilson View Post
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.
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Old 11-19-2006, 02:34 PM   #8
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Miter cuts


Quote:
Originally Posted by jerome8283 View Post
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?
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Old 11-19-2006, 08:58 PM   #9
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Miter cuts


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!
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Old 11-21-2006, 06:18 PM   #10
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Miter cuts


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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