How to Cut a Compound Inside Mitre Cut

To cut a compound inside mitre cut you will need a mitre saw or mitre box, a power or hand saw, a measuring tape, a pencil and safety goggles.




(A) Measure room from corner to corner (DISTANCE A).


(B) Mark DISTANCE A on crown moulding.
After both ends of the crown moulding (Figure B) are compound mitre cut, DISTANCE A will be the longer measurement and will point toward the floor, and DISTANCE B will be the shorter measurement and will point toward the ceiling. When cutting compound mitres, always be sure to place the moulding upside down in the mitre box. (Picture the bottom of the mitre box as the ceiling and the side of the mitre box as the wall.)


How to Cut Piece # 1:

(C) Place crown moulding (#1) upside down (ceiling side down) in mitre box; push crown moulding tight against the mitre box. Set mitre box at 45° to the right and make cut.


How to Cut Piece # 2:

(D) Place crown moulding (#2) in mitre box, ceiling side down. Set mitre box at 45° to the left and make cut. Repeat this process for all inside corners of the room.


(E) Measure the distance between the two crown blocks (#1 and #2).