(info: helix_rtheta: specify center with r,theta, uses helix.ngc)
o<helix_rtheta> sub

#<toolno>     =  #1 (=1)
#<rpm>        =  #2 (=2000)
#<feedrate>   =  #3 (=10)
#<dir>        =  #4 (=3 2:cw, 3:ccw)
#<inside>     =  #5 (=1 1:in, 0:out)
#<cutdepth>   =  #6 (z cutdepth)
#<zincr>      =  #7 (z increment)
#<zsafe>      =  #8 (=0.5)
#<hdiam>      =  #9 (hole diameter)
#<faceangle>  = #10 (=0 face angle)
#<d_angle>    = #11 (=0 d angle)
#<r>          = #12 (r     center)
#<theta>      = #13 (theta center)
#<zstart>     = #14 (=0)
#<spin_notify>= #15 (=0)
#<use_g43>    = #16 (=1)
#<h_for_g43>  = #17 (=0)
#<verbose>    = #18 (=0)

o<loadtool> call [#<toolno>][#<use_g43>][#<h_for_g43>][#<verbose>]
#<tooldiam> = [#5410 + 0.001]

#<x> = [#<r> * COS[#<theta>]]
#<y> = [#<r> * SIN[#<theta>]]
o<helix>call [#<toolno>][#<rpm>][#<feedrate>][#<dir>][#<inside>][#<cutdepth>][#<zincr>][#<zsafe>][#<x>][#<y>][#<hdiam>][#<faceangle>][#<d_angle>][#<zstart>][#<spin_notify>][#<use_g43>][#<h_for_g43>][#<verbose>]
o<helix_rtheta> endsub