Creating MDF frames, how to cut the MDF

you can do those things with a table router.but you can also use jigs to copy things over and over. for most of the applications with a table router, you need to make something for it to follow, you can make radius jigs, speaker rings, you can curve strips of wood and get odd shapes and curves, you can also rabbet the edge of a ring or something to recess it around a speaker or give you a mounting a ridge for you to mount mold fabric to.