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@bradley219

bradley219/focus.py

Created Nov 27, 2017
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Python script for generating a focus routine gcode file. To use, set parameters in the script and execute on the command line. Pipe the output into a gcode file. Example: `./focus.py > focus.gcode`.
#!/usr/bin/env python
def g1_from_point(point):
return "G1 X{} Y{} Z{}\n".format(round(point[0], 5), round(point[1], 5), round(point[2], 5))
def g1_from_speed(speed):
return "G1 F{}\n".format(speed)
if __name__ == '__main__':
guess = 65 # Your best guess of the focus height
guess_padding = 20 # The test will cover your guessed height +/- this value
line_count = 2 # Number of test lines to burn. Minimum is 2.
line_spacing = 0.6 # Spacing between lines
first_line_x = 2.0 + ((line_count + 1) * line_spacing + 1) * 0
prime_x = 0
prime_line_count = 0
do_home = True
starting_z = guess - guess_padding
line_depth = guess_padding
line_start_y = -23 # Y start position of lines
line_end_y = 20 # Y end position of lines
travel_speed = 10000
cut_speed = 140
travel_power = 0 # Laser off
cut_power = 255 # Laser full power
power_off_delay = 5
power_on_delay = 0
zig_zag = True
reverse_z = False
if reverse_z:
starting_z = starting_z + line_count * line_depth
line_depth = -line_depth
gcode = ""
gcode += "M107\n"
gcode += "G90\n"
if do_home:
gcode += "G28\n"
gcode += "G21\n"
gcode += "\n"
for k in range(0, prime_line_count):
gcode += "; Prime {}\n".format(k)
gcode += g1_from_speed(travel_speed)
gcode += g1_from_point((prime_x, line_start_y, starting_z))
gcode += g1_from_speed(cut_speed)
gcode += "M106 S{}\n".format(cut_power)
if power_on_delay > 0:
gcode += "G4 P{}\n".format(power_on_delay)
gcode += g1_from_point((prime_x, line_end_y, starting_z + line_depth / 2.))
gcode += "M106 S{}\n".format(travel_power)
gcode += "G4 P{}\n".format(power_off_delay)
gcode += "\n"
position = (first_line_x, line_start_y, starting_z)
for k in range(0, line_count):
ending_z = starting_z + (k + 1) * line_depth
if zig_zag and k % 2:
ending_z = starting_z + k * line_depth
gcode += "; Line {} Z={} to Z={}\n".format(k, position[2], ending_z)
gcode += g1_from_speed(travel_speed)
gcode += g1_from_point(position)
# calculate next position and set cut speed
position = (position[0], line_end_y, ending_z)
gcode += g1_from_speed(cut_speed)
# laser on and delay
gcode += "M106 S{}\n".format(cut_power)
if power_on_delay > 0:
gcode += "G4 P{}\n".format(power_on_delay)
# cut line
gcode += g1_from_point(position)
# laser off and delay
gcode += "M106 S{}\n".format(travel_power)
gcode += "G4 P{}\n".format(power_off_delay)
# calculate next line start position and move at travel speed
next_starting_z = position[2]
if zig_zag and not k % 2:
next_starting_z = starting_z + (k + 2) * line_depth
position = (position[0] + line_spacing, line_start_y, next_starting_z)
gcode += "\n"
gcode += g1_from_speed(travel_speed)
gcode += "G1 X140 Y91\n"
gcode += "M106 S0\n"
gcode += "M107\n"
gcode += "M18\n"
print gcode
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