Cabinet and Finish Carpentry (C-6) · Lesson 1 of 6

Crown Molding: Spring Angle and Compound Miter Settings

"Crown Molding: Spring Angle and Compound Miter Settings" is lesson 1 of 6 in the Cabinet and Finish Carpentry (C-6) Learning Hub. It opens with "Why Crown Is Different From Other Trim" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. Why Crown Is Different From Other Trim
  2. Find the Spring Angle First
  3. Two Ways to Cut It
  4. The Flat Settings for a 90-Degree Corner
  5. Fit the Room, Not the Chart

The worked example in the course applies this lesson to a realistic job in 6 steps, from "Identify the spring angle" through "Sticks to order".

What you'll be able to do

  • Explain the main idea of "Crown Molding: Spring Angle and Compound Miter Settings" in plain language you can use on the exam.
  • Apply this step with confidence: "Two Ways to Cut It".
  • Apply this step with confidence: "The Flat Settings for a 90-Degree Corner".
  • Apply this step with confidence: "Fit the Room, Not the Chart".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Crown Molding: Spring Angle Sets the Saw WALL CEILING 52° Spring angle = 38° (back of crown to wall) CROWN cross-section FLAT ON TABLE, 90° CORNER MITER: tan(m) = sin(spring) sin 38° = 0.6157 → m = 31.6° BEVEL: sin(b) = cos(spring) / √2 0.7880 / 1.4142 = 0.5572 → b = 33.9° 45° spring: miter 35.3°, bevel 30.0° ORDER THE STOCK Perimeter: 2(12 + 14) = 52 ft +10% waste: 52 x 1.10 = 57.2 ft 57.2 / 12 = 4.8 → 5 sticks of 12 ft 38° spring crown, laid flat: 31.6° miter + 33.9° bevel 12 x 14 ft room: order 5 sticks of 12 ft (60 ft) Basis: trigonometry only, no code table cited. 10% waste is an estimating allowance. Test on scrap.CC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: Why Crown Is Different From Other Trim

Baseboard and casing stand square to the wall, so a plain 45-degree miter closes the corner. Crown molding is the exception: it leans out from the wall to the ceiling, so its back is tilted in two directions at once. A cut that closes the joint has to be a compound cut, meaning a miter setting and a bevel setting working together. Plain statement of source: this lesson rests on geometry only. No California code book prints crown-molding saw settings, so no code table is cited.

Step 2: Find the Spring Angle First

The spring angle is the angle between the back of the crown and the wall. Crown stock is commonly made with a 38-degree spring (the back meets the ceiling at 90 - 38 = 52 degrees, so it is sold as 52/38) or a 45-degree spring (45/45); this lesson uses those two as examples. Check yours by holding a short piece in the corner with a bevel gauge; guessing wrong by even a few degrees opens every joint in the room.

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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