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Angles for cutting crown flat

1:17
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Video by Living Lost

Living Lost

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This project provides a comprehensive explanation of the trigonometric principles required to calculate the correct miter and bevel angles for cutting crown molding flat on a miter saw. It details the formulas for both miter and bevel settings and demonstrates their application for common crown molding spring angles (38-degree and 45-degree), as well as how to adapt for non-90 degree corner angles.

Transcript

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Where did the miter and bevel settings for cutting crown flat actually come from? Believe it or not, these three. Don't worry, you don't need to know trigonometry. You just got to know what to punch into your phone. Let's start with 38° spring angle crown, and the complementary angle that we're using for this formula is 52°. Measure your corner. Mine is 90. Divide that by two, and you get 45. For your miter, plug this into your phone. Arc tangent cosine 52 / tangent 45, and that gives you your 31.6 miter. And for the bevel, arc sign sign 52 * sign 45, and you get 33.8, rounded up to 33.9. But, what if you're not using 38° crown? Let's cut and calculate for 45°. Spring angle is 45°. Using our equation, we'll get 35.2° miter. I'm going to round down to 35, and our bevel is going to be 30. Cut. And if you did your math right, they should fit together like that. Your corner doesn't have to be 90°. Just divide your corner by two. Instead of using 45, just use whatever angle you have. So, instead of memorizing these weird angles, now you can calculate them. Anyways, I got stuff to do. I'll catch you guys later. Peace.

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