Took a few tries but here's my first successful Higbee thread start. : r/Machinists
SPECIFICATION 9-3800
Design for Manufacturing - Villa Machine Associates, Inc.
Patriot Valley Arms - Blunt start thread: a thread with removal of the incomplete thread at the starting end. This is a feature of the threaded parts that are repeatedly assembled by
Programming to Cut a Higbee Thread, Higbee Start, or Blunt Start Thread - CNCCookbook: Be A Better CNC'er