Arcs are tangential if their centre points lie on a common line. So to create an approximate spiral from 90 degree arcs the centres need to step around a square, offset from the arc centre by 1/8 the arc lead.
https://photos.app.goo.gl/x3p5SRsGrM8XQ29G8 -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
