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03-21-2010, 11:48 AM   #1
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## Cutting Base Molding

I have an outside corner that is less than 90 degrees. How do I cut the angles. The corner is 80 degrees so I need to cut at 5o degrees. The miter saw only goes up to 45.

03-21-2010, 02:43 PM   #2
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You said 80 ? isn't half of 80=40 degrees ?

03-21-2010, 09:50 PM   #3
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Maybe make up a miter box?

Quote:
 Originally Posted by oh'mike You said 80 ? isn't half of 80=40 degrees ?
One-half of 80 is 40, but you have to cut the miter at the complementary angle of 90 degrees, because the miter cut is made perpindicular to the the plane of the desired angle. Thus, 90 minus 40 = 50...the degrees to cut the miter.

 03-21-2010, 11:10 PM #4 DIY staff   Join Date: Sep 2009 Location: Kane county,Illinois Posts: 25,728 Rewards Points: 7,174 What? . Last edited by oh'mike; 03-21-2010 at 11:12 PM. Reason: it's to late for math---
 03-21-2010, 11:28 PM #5 Newbie   Join Date: Mar 2010 Posts: 2 Rewards Points: 10 So you can't make that cut on a saw that only goes up to 45 degrees.
 03-22-2010, 07:27 AM #6 DIY staff   Join Date: Sep 2009 Location: Kane county,Illinois Posts: 25,728 Rewards Points: 7,174 You will have to block the fence out so your base sits 5 degrees out--- I still am confused about the explanation--But there are some things that I never do understand,--Mike-- Try this--make a paper template and fold it in half--This will give you the angle. For an out side corner simply lay two sheets of paper on top of each other to give you a paper "corner"--Tape them together-- Fold the template in half--This is the miter angle. Set the saw at 45--slide the template against the blade--see how far off the fence that the back edge of the paper sits--- cut a spacer scrap the width of the gap between the paper and the fence and tape the spacer to the fence. There you go now the saw will cut more than 45.--Mike-- This paper template can be used on inside corners too. Fold a single sheet of paper to match the corner --fold it in half and put the template against the saw fence--set the blade to the paper and you're done. We need Willie-T's magic pencil--I must take the time to learn more about computer sketching----
 The Following User Says Thank You to oh'mike For This Useful Post: Dave88LX (10-24-2013)
 03-22-2010, 09:50 AM #7 Member   Join Date: Feb 2010 Location: Oklahoma Posts: 992 Rewards Points: 506 Miter versus bevel. We need to make certain we're talking about the same thing. How are you cutting the board? Flat, or on edge?
 03-24-2010, 02:47 PM #8 Jack of all - master none     Join Date: Aug 2007 Location: SW Suburbs of Chicago Posts: 1,304 Rewards Points: 692 CAD illustration attached: If your outside corner is 80*, you cut each board at 40*. You have to cut each board at the same angle, or they will not meet up flush. Attached Thumbnails
 The Following User Says Thank You to hyunelan2 For This Useful Post: oh'mike (03-24-2010)
 03-24-2010, 09:53 PM #9 Member     Join Date: Dec 2009 Location: Near Cleveland, Ohio Posts: 2,046 Rewards Points: 1,922 Hyu, That's not the proper orientation for the 80 degrees when referencing a 90 degree corner. The 90 degree corner is opposite of what you are showing. Picture this corner if it were a 45 degree corner, the two walls meeting would form an obtuse angle, not an acute angle like you show in your drawing. This argument comes up from time to time when someone new on a miter saw doesn't understand the orientation of the blade to the fence and doesn't divide the actual angle in half. I hope this makes some sense..... Mike Hawkins
03-24-2010, 11:51 PM   #10
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Quote:
 Originally Posted by hyunelan2 CAD illustration attached: If your outside corner is 80*, you cut each board at 40*. You have to cut each board at the same angle, or they will not meet up flush.

you are wrong!

Quote:
 Originally Posted by firehawkmph Hyu, That's not the proper orientation for the 80 degrees when referencing a 90 degree corner. The 90 degree corner is opposite of what you are showing. Picture this corner if it were a 45 degree corner, the two walls meeting would form an obtuse angle, not an acute angle like you show in your drawing. This argument comes up from time to time when someone new on a miter saw doesn't understand the orientation of the blade to the fence and doesn't divide the actual angle in half. I hope this makes some sense..... Mike Hawkins

you are RIGHT!

 03-25-2010, 09:13 AM #11 Jack of all - master none     Join Date: Aug 2007 Location: SW Suburbs of Chicago Posts: 1,304 Rewards Points: 692 So when you say it's an 80* outside corner, this is what it means? (CAD image attached) Attached Thumbnails
03-25-2010, 04:26 PM   #12
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Yes,
that is more like it. I wasn't sure if I explained it well. Just keep in mind the angle refers to the side of the wall that you are trimming. Then the angle is in reference to a perpedicular line off the wall (90 degrees in a perfect world). In your drawing the wall is just under 90 degrees, so the 80 degree reference makes sense. Then the angle gets divided in half when transferred over to the miter saw. Think of how the miter saw is designed. The saw itself when placed in the 0 degree position is perpendicular to the fence, hence 90 degrees. The fence reprasents the wall at 180 degrees. The saw bisects the fence, which is why we cut our angle in half. Does that make sense? I know it gets confusing when reading. The best thing is to go over to the saw and make a few cuts in scrap pieces and see how it all works.
Mike Hawkins

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