How to Cut Compound Miters and Miter Joints
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- Опубликовано: 13 сен 2024
- Step-by-step demonstration of how to set up a miter saw to cut accurate compound angles for crown molding.
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Transcript:
Crown molding has a way of adding elegance to just about any room, although it can appear massive, it's really an illusion that comes from spanning the ceiling wall joint with a strip of decorative wood set on an angle.
One of the trickiest things about crown molding is cutting the correct angles at the corners. Each corner requires two angles, a miter angle which is cut across the face of the molding and a bevel angle that's formed across the end or edge. When working with crown molding, both of these angles have to be made at the same time, and that's why they're called compound angles. Accuracy is critical, an error of even one degree or less can result in an ill fitting joint. The tool to make this cut is the power Miter saw. One way to make a combination miter is by cutting the molding while it's held on an angle. When using this technique though, it's important to make sure the back surfaces of the molding are fully in contact with the fence and saw bit. While you can handhold the molding in place there's always the chance the workpiece can move during cutting. Some saws like this DeWALT model have available as an accessory, these adjustable crown molding stops.
Another way to make certain the molding does not shift while being cut is to make a simple wooden jig to hold it firmly in place. A jig can be easily made by attaching together two pieces of half inch plywood, making certain that they form an accurate right angle. After the glue is dry, the jig is set in place on the miter saw bed and attached with screws inserted through pre-drilled holes in the metal fence.
With the jig secured cuts are made at 45 degrees and zero degrees. Then a sample piece of molding is set into the jig, wooden stops are then put in place next to the edge and stapled in place. No glue should be used here since the stop would need to be relocated if a different size molding were being cut. The jig holds the crown securely in just the right position each time a cut is made, no adjusting, no slipping.
What does have to be adjusted though, is the swing on the miter saw. That's because even though they may look square, many wall corners do not form perfect 90 degree angles. So each corner needs to be measured individually and that measurement must be accurate to get a tight fitting miter.
Now, the old way of doing this was to take a bevel gauge, adjusted to fit the corner, lay the bevel gauge on top of a protractor, read the angle on the protractor, subtract that reading from 180, then divide the result by two, that provided the miter saw setting.
Well, fortunately, there's a much faster, simpler and more accurate way. This 505P protractor from Starrett Tools is designed just for this job. Place it in the corner and open the wings until they come into contact with the wall. Now, and this is the slick part, simply read the miter saw setting directly from the tool. No calculating, no transferring measurements and practically no chance for error.
Now there are two types of crown miter joints, inside corners and outside corners. Here are the steps for making each.
In most cases, the crown molding bottom is the edge that has the most detail. One thing is common to both inside and outside corners and that is the molding must be placed into the saw with the bottom edge up. In other words, the bottom edge will always be against the miter saw fence. It's also important to keep in mind whether you're cutting the left hand or right hand piece of molding. OK, here we go. When cutting the left hand piece of an inside corner, swing the miter arm to the right and place the workpiece on the right side of the blade. To cut the right hand section of an inside corner swing the miter arm to the left and place the workpiece to the left of the blade.
Great instructional video, thank you for posting. This helped me more than any other video I’ve seen. These compound cuts freak me out! 😳
I enjoy watching Ron get it done right.
Just cut our first ever roomful of coving. Mind bending, and we couldn't have done it without this video. You are the only person who explained how to set up the saw and piece of coving for each of the 4 different cuts that are required for internal and external corners, and we have watched many, many videos! Thank you.
When someone is good at something they make it look so easy.
He is an excellent instructor.
A brilliant concise video..thank you very much😂
So much tips and hacks in such a small space. Cheers
Superb quality throughout, easy to assemble. I found the saw to be highly accurate and a delight to use (I am a homeowner using this saw for various projects). I attached the saw to a folding mobile stand to save space and that works great ruclips.net/user/postUgkxPeGkHOMe05FySypTOvYumxMn-xi39oRe as well. However, you have to be sure the saw is securely locking in position before collapsing the stand. I've had many of the brands over the years and have come to point where I only buy Bosch, the extra money is a small price to pay for the quality and ease of use. Treat yourself to the best.
Like how you talk and show what you are teaching us make it look so easy nice job
Thanks Ron, jig worked well!
Why didn’t I see this video before I started. It is clear and accurate. I made a jig just like yours, but it took me a while to realise the bottom should be up. Other videos are not as well explained. Thanks and thumbs up many times over if I could.
Excellent video. Clear and concise.
This is a great video with easy to follow instructions. I'm very happy with my results. I had to make 2 inside corners and 2 outside corners. I attribute the fact that I did not make any mistakes to this video. Thank you!
That was very informative. It can be very confusing cutting crown molding…. Thank you Ron……
Ty so much best tutorial i found that got rigth to it in easy to understand fashion..thx again hope mine turns out well..
Good information 👍
excellent tips thumbs up
I am very interested on how you get a precise length from the wall distance. You showed wonderfully how to get the angle, I'd like to see how you work with measurements
Always measure for the bottom of the molding.
Nice, but I was hoping you would show a video of doing a compound miter of crown molding, when you have a roofline that's pitched and you're doing facia coming off a shed roof. Normally when I'm cutting facia, I make a straight 45 on the level board and a compound miter on the pitched board, but on this job, the facia has crown molding and that just won't do.
Excellent thanks for the help...
Canadiangunman ss
Use the Fusco chart for the mitre and bevel angle for your compound cut.
Thank you for the video I noticed in the last showing there was no nail holes and caulk was applied not mentioned in the video but it was educational
Awesome.
Great. Video awesome
fyi the recommended link to Starett / crown does not work
So...how do you cut a compound angle. The video never answers this question. It basically says, make a jig so you don't have to. Bad title.
You answered your own question.
Yes! I have a sloping ceiling, and a corner. This doesn't really show a compound cut; just a regular cut on a piece that needs to be at an angle.
Exactly
Did he get a divorce...I don't see that he no longer wears his wedding band, forget it about you answered my question...yup the wife x him.
Adoboman Goyaman Where did you see that they got divorced???
Well. That was useless. Nothing more than a commercial.