I'm trying to make automatic feeders for PNP using two PCBs as the "walls" of the feeder. I was thinking it would be great to mill into the PCB walls partially to guide the SMT tape. Is it possible to export gerbers and upload to a service like JLCPCB.com so they can automatically mill a certain depth rather than milling all the way through?
I know I can probably get a CNC and do it myself, but was wondering if a service provider can be directed to do it somehow? See attached examples of countersunk PCBs I found online.