I use a “kiss” fit where things are cut to the ideal size – usually they “just fit” (but calibrate first if using a belt-drive machine)
https://community.carbide3d.com/t/cutting-boxes-and-a-new-toy/66302/10
and have done mortise and tenon:
as well as various other joinery designs — in particular, blind miter box joints which do not require a fixture:
If you’ll let us know the specifics of a box design:
- dimensions — height, width, depth
- stock thickness
- desired features: lid, &c.
and if you’re willing to purchase a narrow V endmill which matches a smaller endmill such as our 1/8" #102 I’ll gladly walk through working up a design with you.
Not commercial, but I put a design up on Cutrocket: