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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Feedthough/via that straddles (i.e., is bisected by) the cut edge
 of a PCB?
Date: Wed, 29 May 2024 06:41:48 -0700
Organization: A noiseless patient Spider
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On 5/29/2024 6:20 AM, dalai lamah wrote:
> The keyword to look for is "castellated holes". The easier way to do it is
> to find a manufacturer that explicitly supports them, and follow their
> instructions. For example:
> 
> https://www.pcbway.com/pcb_prototype/What_are_Plated_Half_Holes_Castellated_Holes_.html

Excellent!  /Grazie tante/

A first pass through the description doesn't seem to EXPLICITLY say it but
it seems like they are implying that the drilling occurs ON the edge, and not 
before milling?  I.e., each drilling action results in ONE such "hole" -- not
two HALF holes (on adjoining panelized boards)

"...BEGINS with drilling ON the edge of the substrate..." (emphasis mine)

I will contact the vendor to see what the economic consequences are likely
to be.  (and, will know how to search for others with similar capabilities!)