bradley219 · November 27, 2017 04:55 · Nov 27, 2017
diff --git a/focus.py b/focus.py
@@ -0,0 +1,102 @@
+#!/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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