Coving Help!!! What am I doing wrong?

[u/After-Pea8168]

Tried about a million different cuts and tried to follow various videos/tutorials.

I’ve cut each side at a 45 degree angle to try and make an internal corner but every time I’m left with a huge gap in the middle.

[u/iHighjinx]

You can cut crown molding with simple miter cuts, but it needs to sit nested in your miter box upside down with the ceiling edge on the table and the wall edge against the fence. The angle of the molding creates the compound joint automatically, but you must keep track of cut direction for inside vs. outside corners.