svg2gcode/gcode.py

Sat, 04 Jun 2016 10:01:58 +0200

author
mbayer
date
Sat, 04 Jun 2016 10:01:58 +0200
changeset 21
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parent 8
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permissions
-rw-r--r--

more fixes before trying to finish svg compiler

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1 import math
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2
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3 INCH = 25.4 # mm
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4 STEPS_PER_MM = 80 # hardware: steps/mm on XY
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6 class Gcode(object):
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7 def __init__(self, scale=1.0, travel_speed=20, engrave_speed=20):
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8 self.dpi = 300
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9 self.e_factor = 0.1
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10 self.mm_pixel = round(INCH / self.dpi, 4)
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12 self.lines = []
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13 self.dist_start = (0, 0)
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14 self.dist = 0.0
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16 self.scale = scale
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17 self.travel_speed = travel_speed * 60
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18 self.engrave_speed = engrave_speed * 60
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19
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20 self._check_resolution()
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22 def _check_resolution(self):
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23 steps_pixel = self.mm_pixel * STEPS_PER_MM
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24 print "Resolution is %f mm per pixel" % self.mm_pixel
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25 if steps_pixel <= 5:
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26 print "Warning: Steps per pixel (needs to be > 5, otherwise marlin joins lines): %f" % steps_pixel
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27
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28 def _dimensions(self, x, y):
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29 x = self.mm_pixel * x
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30 y = self.mm_pixel * y
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31 if self.scale != 1.0:
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32 x = x * self.scale
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33 y = y * self.scale
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34 return (x, y)
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35
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36 def comment(self, msg):
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37 self.lines.append("; %s" % msg)
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38
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39 def move(self, x, y):
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40 x, y = self._dimensions(x, y)
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41 if self.e_factor > 0:
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42 self.dist_start = (x, y)
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43 self.dist = 0.0
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44 self.lines.append("G92 E0") # reset extruder length
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45 self.lines.append(
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46 "G0 X%.4f Y%.4f F%s" % (x, y, self.travel_speed)
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47 )
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48
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49 def engrave(self, x, y):
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50 x, y = self._dimensions(x, y)
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51 if self.e_factor > 0:
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52 self.dist += abs(math.hypot(x - self.dist_start[0], y - self.dist_start[1]))
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53 e = "E%.4f" % (self.e_factor * self.dist)
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54 self.dist_start = (x, y)
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55 else:
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56 e = ""
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57 self.lines.append(
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58 "G1 X%.4f Y%.4f %s F%s" % (x, y, e, self.engrave_speed)
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59 )
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62 def write(self, filename):
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63 # write gcode file
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64 fout = open(filename, "w")
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65
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66 fout.write("""; Filename: %s
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67 ; GCode generated by one-night-and-several-days-not-so-quick-hack-script (marlin code flavour)
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68 ; https://neo-soft.org/hg-public/lasercut-scripts
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69 G21 ; Metric
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70 ; We assume Z is in focus height and laser head is focus at bottom left of image!
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71 G92 X0 Y0 E0 ; set zero position - new origin
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72 G90 ; absolute positioning
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73 M82 ; Set extruder (laser) to absolute positioning
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74 M201 X1000 Y1000 E500 ; Set acceleration
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75 M203 X1000 Y1000 Z4 E10 ; Set max feedrate
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76 M209 S0 ; disable firmware retraction, we dont want to burn holes...
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77 M302 ; Allow cold extrudes - doesnt matter because we hack the extruder physically off with the M571 E mod
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78 M571 S1 E1 ; Activate Laser output on extrusion, but block real motor movement!
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79 G0 X0 Y0 F%.1f ; Set moving speed
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80 G1 X0 Y0 F%.1f ; Set engrave speed
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81
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82 """ % (filename, self.travel_speed, self.engrave_speed))
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83
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84 for g in self.lines:
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85 fout.write(g + "\n")
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86 fout.close()

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