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# ***************************************************************************
# * Copyright (c) 2014 sliptonic <shopinthewoods<at>gmail.com> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * FreeCAD is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Lesser General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with FreeCAD; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
"""
This is a preprocessor file for the Path workbench. Its aim is to
parse the contents of a given OpenSBP file, and transform it to make it
suitable for use in a Path object. This preprocessor, once placed in the
appropriate PathScripts folder, can be used directly from inside FreeCAD,
via the GUI importer or via python scripts with:
import opensbp_pre
opensbp_pre.insert("/path/to/myfile.ngc","DocumentName")
DONE
Correctly imports single axis and multi axis moves.
Stores Jog and Feed speeds
Appends Multiaxis Feed speed to G1 moves
Jog rates don't append to G0 moves
Make single axis feed rates work
Imports CG (non-diameter) arcs.
Handles CW and CCW spindle speeds
if operations are preceded by a comment ('New Path ...) They are split into multiple paths
TODO
Many other OpenSBP commands not handled
"""
import FreeCAD
import Path
import os
import Path
from builtins import open as pyopen
AXIS = (
"X",
"Y",
"Z",
"A",
"B",
) # OpenSBP always puts multiaxis move parameters in this order
SPEEDS = "XY", "Z", "A", "B"
def open(filename):
"called when freecad opens a file."
docname = os.path.splitext(os.path.basename(filename))[0]
doc = FreeCAD.newDocument(docname)
insert(filename, doc.Name)
def insert(filename, docname):
"""called when freecad imports a file
This insert expects parse to return a list of strings
each string will become a separate path"""
gfile = pyopen(filename)
gcode = gfile.read()
gfile.close()
gcode = parse(gcode)
doc = FreeCAD.getDocument(docname)
for subpath in gcode:
obj = doc.addObject("Path::Feature", "Path")
path = Path.Path(subpath)
obj.Path = path
def parse(inputstring):
"parse(inputstring): returns a list of parsed output string"
print("preprocessing...")
# split the input by line
lines = inputstring.split("\n")
return_output = []
output = ""
last = {"X": None, "Y": None, "Z": None, "A": None, "B": None}
lastrapidspeed = {
"XY": "50",
"Z": "50",
"A": "50",
"B": "50",
} # set default rapid speeds
lastfeedspeed = {
"XY": "50",
"Z": "50",
"A": "50",
"B": "50",
} # set default feed speed
movecommand = ["G1", "G0", "G02", "G03"]
for line in lines:
# remove any leftover trailing and preceding spaces
line = line.strip()
if not line:
# discard empty lines
continue
if line[0] in ["'", "&"]:
# discard comment and other non strictly gcode lines
if line[0:9] == "'New Path":
# starting new path
if any(
x in output for x in movecommand
): # make sure the path has at least one move command.
return_output.append(output)
output = ""
continue
words = [a.strip() for a in line.split(",")]
words[0] = words[0].upper()
if words[0] in [
"J2",
"J3",
"J4",
"J5",
"M2",
"M3",
"M4",
"M5",
]: # multi-axis jogs and moves
if words[0][0] == "J": # jog move
s = "G0 "
else: # feed move
s = "G1 "
speed = lastfeedspeed["XY"]
for i in range(1, len(words)):
if words[i] == "":
if last[AXIS[i - 1]] is None:
continue
else:
s += AXIS[i - 1] + last[AXIS[i - 1]]
else:
s += AXIS[i - 1] + words[i]
last[AXIS[i - 1]] = words[i]
output += s + " F" + speed + "\n"
if words[0] in [
"JA",
"JB",
"JX",
"JY",
"JZ",
"MA",
"MB",
"MX",
"MY",
"MZ",
]: # single axis jogs and moves
if words[0][0] == "J": # jog move
s = "G0 "
if words[0][1] in ["X", "Y"]:
speed = lastrapidspeed["XY"]
else:
speed = lastrapidspeed[words[0][1]]
else: # feed move
s = "G1 "
if words[0][1] in ["X", "Y"]:
speed = lastfeedspeed["XY"]
else:
speed = lastfeedspeed[words[0][1]]
last[words[0][1]] = words[1]
output += s
for key, val in last.items():
if val is not None:
output += key + str(val) + " F" + speed + "\n"
if words[0] in ["JS"]: # set jog speed
for i in range(1, len(words)):
if words[i] == "":
continue
else:
lastrapidspeed[SPEEDS[i - 1]] = words[i]
if words[0] in ["MD"]: # move distance with distance and angle.
# unsupported at this time
continue
if words[0] in ["MH"]: # move home
# unsupported at this time
continue
if words[0] in ["MS"]: # set move speed
for i in range(1, len(words)):
if words[i] == "":
continue
else:
lastfeedspeed[SPEEDS[i - 1]] = words[i]
if words[0] in ["MO"]: # motors off
# unsupported at this time
continue
if words[0] in ["TR"]: # Setting spindle speed
if float(words[1]) < 0:
s = "M4 S"
else:
s = "M3 S"
s += str(abs(float(words[1])))
output += s + "\n"
if words[0] in ["CG"]: # Gcode circle/arc
if words[1] != "": # diameter mode
print("diameter mode not supported")
continue
else:
if words[7] == "1": # CW
s = "G2"
else: # CCW
s = "G3"
s += (
" X"
+ words[2]
+ " Y"
+ words[3]
+ " I"
+ words[4]
+ " J"
+ words[5]
+ " F"
+ str(lastfeedspeed["XY"])
)
output += s + "\n"
last["X"] = words[2]
last["Y"] = words[3]
# Make sure all appended paths have at least one move command.
if any(x in output for x in movecommand):
return_output.append(output)
print("done preprocessing.")
return return_output
print(__name__ + " gcode preprocessor loaded.")
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