Spiral gcode generator

#! /usr/bin/python

# This spiral drilling gcode generator by Dmitry Platonov is public domain
# Feel free to edit, distribute and use it any way you like
# contact author [email protected]

#setup
feed = 800
feed_finish = 100
center_x = 25.0
center_y = 90.0
safe_z = 15.0
start_z = 0.0
stop_z = -24.0
step_z = -2.0
r = 1.1
#setup end

base_x = center_x - r
base_y = center_y

cur_z = start_z
print "G0 Z%.4f" % (safe_z,)
print "G0 X%.4f Y%.4f" % (base_x, base_y)
print "G0 Z%.4f" % (start_z,)
while cur_z > stop_z:
        cur_z += step_z
        print "G3 X%.4f Y%.4f I%.4f J0 Z%.4f F%f" % (base_x, base_y, r, cur_z, feed)
print "G3 X%.4f Y%.4f I%.4f J0 Z%.4f F%f" % (base_x, base_y, r, cur_z, feed)
print "G3 X%.4f Y%.4f I%.4f J0 Z%.4f F%f" % (base_x, base_y, r, cur_z, feed)
print "G3 X%.4f Y%.4f I%.4f J0 Z%.4f F%f" % (base_x, base_y, r, cur_z, feed)
print "G3 X%.4f Y%.4f I%.4f J0 Z%.4f F%f" % (base_x, base_y, r, cur_z, feed_finish)
print "G3 X%.4f Y%.4f I%.4f J0 Z%.4f F%f" % (base_x, base_y, r, cur_z, feed_finish)
print "G0 X%.4f Y%.4f Z%.4f" % (center_x, center_y, safe_z)
print "M30"
print "%"