(Test case for detecting tangent helix)
G20 G90 G64 G17
F9999
G0 X0 Y0 Z0
G0 X0 Y0 Z-0.26794919243
G1 X1 Z0
G2 Z1.6835744289 J-1 
G1 Y1
Z0
G0 X0 Y0 Z0
G0 X0 Y0 Z-0.26794919243
G1 X1 Z0
G2 Z1.6835744289 J-1 
G1 X2 Z1.95152362133
Z0
G0 X0 Y0 Z0
M2