added another version of helical boring example that works with current arcs
added another version of helical boring example that works with current arcs

gaziel/heekscnc,gaziel/heekscnc,gaziel/heekscnc,gaziel/heekscnc,tbinias/heekscnc,tbinias/heekscnc,tbinias/heekscnc,tbinias/heekscnc