Working on a project where I have to put moldings inside a shaker door. The moldings are rabbeted on the outside and that makes it difficult to just cut them production style like you should be able to. Mark it, cut it and it fits almost every time.
Couldn't remember how I did it last time, maybe just guessed and plodded along, don't know. But this time I figured it out so it like cutting a normal molding.
1st you cut all your rights or lefts. I left mine 1" over length. Make sure you have dead nuts 45º of course.
Then I flipped it to the opposite 45 and put a pc of tape on the base of the miter saw
The solid line is the perfect miter and the smaller line is the offset for the rabbet that I use for the line to cut the molding.
Then I mark the molding. I started out by nesting one side and looking under and marking it, then drawing a line with a square and marking the front. After two cuts I realized I can eliminate all of that by just marking the front of the molding directly this way.
Then you line the line on the molding up with the offset line on the tape and cut it. I'm always pushing it a bit farther past the line by maybe half a line to get it so all 4 moldings will nest without being too tight.
And so far I've done 2 doors without having to make any extra cuts. I use a mallet to get them in because the fit is so exact. Couple of light taps to get everything set and then it pushes down.