Transpile python into cnc gcode.
Project description
- Author:
sac
1 p2g - Python 2 G-code
Many styli died to bring us this information.
This is a Python to G-code transplier
It takes Python code, some definitions of machine specific variables, a little glue and makes G-code, so far, Haas ideomatic.
Thanks to magic it can do surprising things with python data structures, anything reasonably calculated statically during compilation can be used in the source, classes, dicts, and so on.
It comes with a set of macro variable definitions for a Haas mill with NCD. And a few example settings for my own VF-3SSYT.
2 Install:
$ pip install p2g
maybe:
$ p2g examples
or:
$ cat > tst.py <<EOF
import p2g
def t():
x = p2g.Var(9)
for y in range(10):
x += y
EOF
$ p2g gen tst.py
yields
O0001 ( TST ) #100= 9. ( x = Var[9] ) #102= 0. ( for y in range[10]: ) L2000 IF [#102 GE 10.] GOTO 2002 #100= #100 + #102 ( x += y ) #102= #102 + 1. GOTO 2000 L2002 M30
3 A taste.
from p2g import *
from p2g.haas import *
fast_go = goto.feed(640)
fast_probe = goto.probe.feed(30)
class SearchParams:
def __init__(self, name, search_depth, iota, delta):
self.name = name
self.its = 10
self.search_depth = search_depth
self.iota = iota
self.delta = delta
self.probe = goto.probe.feed(30)
self.go = goto.feed(640)
def search(cursor, sch):
# stick from class SearchParams iterations into macro var
its = Var(sch.its)
while its > 0:
# goto start point
sch.go(cursor)
# down until hit - or not.
sch.probe(z=sch.search_depth)
# if probe is below (+some slack) hit
# point, then done.
if SKIP_POS.z < sch.search_depth + sch.iota:
break
# otherwise move to next point
cursor.xy += sch.delta
its -= 1
else:
message(ALARM.var, f"too far {sch.name}.", code=101)
def demo1():
cursor = Var[3](2, 3, 4)
# searching right, look down 0.4", move
# 1.5" right if nothing hit.
sch1 = SearchParams(name="right", search_depth=-0.4, iota=-0.1, delta=(1.5, 0))
search(cursor, sch1)⇨ p2g gen demo1.py ⇨
O0001 ( - )
#100= 2. ( cursor = Var[3][2, 3, 4] )
#101= 3.
#102= 4.
#103= 10. ( its = Var[sch.its] )
L1000 ( while its > 0: )
IF [#103 LE 0.] GOTO 1002
G01 G90 F640. x#100 y#101 z#102 ( sch.go[cursor] )
G01 G90 G31 F30. z-0.4 ( sch.probe[z=sch.search_depth])
IF [#5063 LT -0.5] GOTO 1001 ( if SKIP_POS.z < sch.search_depth + sch.iota:)
#100= #100 + 1.5 ( cursor.xy += sch.delta )
#103= #103 - 1. ( its -= 1 )
GOTO 1000
L1002
#3000= 101. ( too far right. )
L1001 ( message[ALARM.var, f"too far {sch.name}.", code=101])
M30
4 Coordinates
Describe position, with axis by location, in sequence or by name.
from p2g import * # this is the common header
from p2g.haas import * # to all the examples
def co1():
com ("Coords by order.")
p1 = Fixed[3](1, 2, 3, addr=100)
com ("Coords by axis name.")
p2 = Fixed[3](z=333, y=222, x=111, addr=200)
p2.x = 17
com ("Coords by index.")
p1.xyz = p2[2]
p2[1:3] = 7
com ("Mixemup.")
p1.yz = p2.yz[1]
com ("Rotaries.")
p4 = Fixed[6]()
p4.a = 180
p4.c = asin (0.5)⇨ p2g gen co1.py ⇨
O0001 ( - ) ( Coords by order. ) #100= 1. ( p1 = Fixed[3][1, 2, 3, addr=100]) #101= 2. #102= 3. ( Coords by axis name. ) #200= 111. ( p2 = Fixed[3][z=333, y=222, x=111, addr=200]) #201= 222. #202= 333. #200= 17. ( p2.x = 17 ) ( Coords by index. ) #100= #202 ( p1.xyz = p2[2] ) #101= #202 #102= #202 #201= 7. ( p2[1:3] = 7 ) #202= 7. ( Mixemup. ) #101= #202 ( p1.yz = p2.yz[1] ) #102= #202 ( Rotaries. ) #103= 180. ( p4.a = 180 ) #105= 30. ( p4.c = asin [0.5] ) M30
5 Variables
Give names to macro variables at a known address:
Fixed ❰ [ size ] ❱opt(addr= addr ❰ , init … ❱opt)
Give names to macro variables automatically per function.
Var ❰ [ size ] ❱opt(❰ , init … ❱opt)
Not actually a variable, but same syntax.
Const ❰ [ size ] ❱opt(❰ , init … ❱opt)
Example:
from p2g import * # this is the common header
from p2g.haas import *
def ex2():
# On my machine, Renishaw skip positions are
# in 5061, 5062, 5063. Look in p2g.haas.py
# for : SKIP_POS = p2g.Fixed[20](addr=5061)
skip0 = SKIP_POS
# can be done manualy too.
skip1 = Fixed[3](addr=5061)
# grab 5041.. from globals oto.
workpos = WORK_POS
tmp0 = Var( skip0.xyz * 2.0 + workpos + skip1)
com("Define a constant ")
above_tdc = Const (111,222,333)
com("Use it ")
tmp0 += above_tdc⇨ p2g gen var1.py ⇨
O0001 ( - ) #100= #5061 * 2. + #5041 + #5061( tmp0 = Var[ skip0.xyz * 2.0 + workpos + skip1]) #101= #5062 * 2. + #5042 + #5062 #102= #5063 * 2. + #5043 + #5063 ( Define a constant ) ( Use it ) #100= #100 + 111. ( tmp0 += above_tdc ) #101= #101 + 222. #102= #102 + 333. M30
6 Expressions
Python expressions turn into G-Code as you may expect, save that native Python uses radians for trig, and G-Code uses degrees, so folding is done in degrees.
from p2g import * # this is the common header
from p2g.haas import * # to all the examples
def exp11():
com ("Variables go into macro variables.")
theta = Var(0.3)
angle = Var(sin(theta))
com ("Constants don't exist in G-code.")
thetak = Const(0.3)
anglek = Var(sin(thetak))
com ("Lots of things are folded.")
t1 = Var(2 * thetak + 7)
com ("Simple array math:")
box_size = Const([ 4,4,2 ])
tlhc = Var( - box_size / 2)
brhc = Var(box_size / 2)
diff = Var(tlhc - brhc)
a,b,x = Var(),Var(),Var()
a = tlhc[0] / tlhc[1]
b = tlhc[0] % tlhc[1]
x = tlhc[0] & tlhc[1]
tlhc.xy = ((a - b + 3) / sin(x),
(a + b + 3) / cos(x))⇨ p2g gen exp1.py ⇨
O0001 ( - ) ( Variables go into macro variables. ) #100= 0.3 ( theta = Var[0.3] ) #101= SIN[#100] ( angle = Var[sin[theta]] ) ( Constants don't exist in G-code. ) #102= 0.0052 ( anglek = Var[sin[thetak]] ) ( Lots of things are folded. ) #103= 7.6 ( t1 = Var[2 * thetak + 7] ) ( Simple array math: ) #104= -2. ( tlhc = Var[ - box_size / 2] ) #105= -2. #106= -1. #107= 2. ( brhc = Var[box_size / 2] ) #108= 2. #109= 1. #110= #104 - #107 ( diff = Var[tlhc - brhc] ) #111= #105 - #108 #112= #106 - #109 #113= #104 / #105 ( a = tlhc[0] / tlhc[1] ) #114= #104 MOD #105 ( b = tlhc[0] % tlhc[1] ) #115= #104 AND #105 ( x = tlhc[0] & tlhc[1] ) ( tlhc.xy = [[a - b + 3] / sin[x],) #104= [#113 - #114 + 3.] / SIN[#115] #105= [#113 + #114 + 3.] / COS[#115] M30
7 Axes
Any number of axes are supported, default just being xy and z. A rotary on ac can be set with p2g.AXIS.NAMES=”xyza*c”. The axis letters should be the same order as your machine expects coordinates to turn up in work offset registers.
from p2g import *
from p2g.haas import *
def a5():
p2g.axis.NAMES = 'xyza*c'
p2g.com ("rhs of vector ops get expanded as needed")
G55.var = [0,1]
p2g.com ("fill yz and c with some stuff")
tmp1 = Const(y=3, z=9, c=p2g.asin(.5))
p2g.com ("Unmentioned axes values are assumed",
"to be 0, so adding them makes no code.")
G55.var += tmp1
p2g.com ("")
G55.ac *= 2.0
def a3():
# xyz is the default.
# but overridden because a5 called first, so
p2g.axis.NAMES = 'xyz'
p2g.com ("Filling to number of axes.")
G55.var = [0]
tmp = p2g.Var(G55 * 34)
def axes():
a5()
a3()⇨ p2g gen axes.py ⇨
O0001 ( - ) #5241= 0. ( G55.var = [0] ) #5242= 0. #5243= 0. #5244= 0. #5245= 0. #5246= 0. #5242= #5242 + 3. ( G55.var += tmp1 ) #5243= #5243 + 9. #5246= #5246 + 30. #5244= #5244 * 2. ( G55.ac *= 2.0 ) #5246= #5246 * 2. #5241= 0. ( G55.var = [0] ) #5242= 0. #5243= 0. #100= #5241 * 34. ( tmp = Var[G55 * 34] ) #101= #5242 * 34. #102= #5243 * 34. M30
8 Printing
Turns Python f string prints into G-code DPRNT. Make sure that your print string does not have any characters in it that your machine considers to be illegal in a DPRNT string.
from p2g import *
from p2g.haas import *
def exprnt():
x = Var(2)
y = Var(27)
for q in range(10):
dprint(f"X is {x:3.1f}, Y+Q is {y+q:5.2f}")⇨ p2g gen exprnt.py ⇨
O0001 ( - )
#100= 2. ( x = Var[2] )
#101= 27. ( y = Var[27] )
#103= 0. ( for q in range[10]: )
L1000
IF [#103 GE 10.] GOTO 1002
( dprint[f"X is {x:3.1f}, Y+Q is {y+q:5.2f}"])
DPRNT[X*is*[#100][31],*Y+Q*is*[#101+#103][52]]
#103= #103 + 1.
GOTO 1000
L1002
M30
9 Notes.
The entire thing is brittle; I’ve only used it to make code for my own limited purposes.
from p2g import *
from p2g.haas import *
class X():
def __init__(self, a,b):
self.a = a
self.b = b
def adjust(self, tof):
self.a += tof.x
self.b += tof.y
def cool():
com ("You can do surprising things.")
p = X(12,34)
p.adjust(TOOL_OFFSET)
tmp = Var(p.a, p.b)O0001 ( - ) ( You can do surprising things. ) #100= #5081 + 12. ( tmp = Var[p.a, p.b] ) #101= #5082 + 34. M30
from p2g import *
from p2g.haas import *
G55 = p2g.Fixed[3](addr=5241)
def beware():
com(
"Names on the left hand side of an assignment need to be",
"treated with care. A simple.",
)
G55 = [0, 0, 0]
com(
"Will not do what you want - this will overwrite the definition",
"of G55 above - so no code will be generated.",
)
com(
"You need to use .var (for everything), explicitly name the axes,"
"or use magic slicing."
)
G56.var = [1, 1, 1]
G56.xyz = [2, 2, 2]
G56[:] = [3, 3, 3]O0001 ( - ) ( Names on the left hand side of an assignment need to be ) ( treated with care. A simple. ) ( Will not do what you want - this will overwrite the definition ) ( of G55 above - so no code will be generated. ) ( You need to use .var [for everything], explicitly name the axes,or use magic slicing. ) #5261= 1. ( G56.var = [1, 1, 1] ) #5262= 1. #5263= 1. #5261= 2. ( G56.xyz = [2, 2, 2] ) #5262= 2. #5263= 2. #5261= 3. ( G56[:] = [3, 3, 3] ) #5262= 3. #5263= 3.
from p2g import *
from p2g.haas import *
def beware1():
com ("It's easy to forget that only macro variables will get into",
"the output code. Generated ifs with a constant are a give away:")
x = 123
y = Var()
if x==23 : # look here
y = 9
com ("Should look like:")
x = Var(123)
y = Var()
if x==23 : # look here
y = 9
else:
y = 99O0001 ( - ) ( It's easy to forget that only macro variables will get into ) ( the output code. Generated ifs with a constant are a give away: ) IF [1.] GOTO 1000 ( if x==23 : # look here ) #100= 9. ( y = 9 ) GOTO 1001 L1000 L1001 ( Should look like: ) #101= 123. ( x = Var[123] ) #100= #102 ( y = Var[] ) IF [#101 NE 23.] GOTO 1002 ( if x==23 : # look here ) #100= 9. ( y = 9 ) GOTO 1003 L1002 #100= 99. ( y = 99 ) L1003 M30
10 HAAS macro var definitions
Names predefined in p2g.haas:
Name |
Size |
Address |
NULL |
1 |
# 0 |
MACRO_ARGUMENTS |
33 |
# 1 … # 33 |
GP_SAVED1 |
100 |
# 100 … # 199 |
GP_SAVED2 |
50 |
# 500 … # 549 |
PROBE_CALIBRATION1 |
6 |
# 550 … # 555 |
PROBE_R |
3 |
# 556 … # 558 |
PROBE_CALIBRATION2 |
22 |
# 559 … # 580 |
GP_SAVED3 |
119 |
# 581 … # 699 |
GP_SAVED4 |
200 |
# 800 … # 999 |
INPUTS |
64 |
# 1000 … # 1063 |
MAX_LOADS_XYZAB |
5 |
# 1064 … # 1068 |
RAW_ANALOG |
10 |
# 1080 … # 1089 |
FILTERED_ANALOG |
8 |
# 1090 … # 1097 |
SPINDLE_LOAD |
1 |
# 1098 |
MAX_LOADS_CTUVW |
5 |
# 1264 … # 1268 |
TOOL_TBL_FLUTES |
200 |
# 1601 … # 1800 |
TOOL_TBL_VIBRATION |
200 |
# 1801 … # 2000 |
TOOL_TBL_OFFSETS |
200 |
# 2001 … # 2200 |
TOOL_TBL_WEAR |
200 |
# 2201 … # 2400 |
TOOL_TBL_DROFFSET |
200 |
# 2401 … # 2600 |
TOOL_TBL_DRWEAR |
200 |
# 2601 … # 2800 |
ALARM |
1 |
# 3000 |
T_MS |
1 |
# 3001 |
T_HR |
1 |
# 3002 |
SINGLE_BLOCK_OFF |
1 |
# 3003 |
FEED_HOLD_OFF |
1 |
# 3004 |
MESSAGE |
1 |
# 3006 |
YEAR_MONTH_DAY |
1 |
# 3011 |
HOUR_MINUTE_SECOND |
1 |
# 3012 |
POWER_ON_TIME |
1 |
# 3020 |
CYCLE_START_TIME |
1 |
# 3021 |
FEED_TIMER |
1 |
# 3022 |
CUR_PART_TIMER |
1 |
# 3023 |
LAST_COMPLETE_PART_TIMER |
1 |
# 3024 |
LAST_PART_TIMER |
1 |
# 3025 |
TOOL_IN_SPIDLE |
1 |
# 3026 |
SPINDLE_RPM |
1 |
# 3027 |
PALLET_LOADED |
1 |
# 3028 |
SINGLE_BLOCK |
1 |
# 3030 |
AGAP |
1 |
# 3031 |
BLOCK_DELETE |
1 |
# 3032 |
OPT_STOP |
1 |
# 3033 |
TIMER_CELL_SAFE |
1 |
# 3196 |
TOOL_TBL_DIAMETER |
200 |
# 3201 … # 3400 |
TOOL_TBL_COOLANT_POSITION |
200 |
# 3401 … # 3600 |
M30_COUNT1 |
1 |
# 3901 |
M30_COUNT2 |
1 |
# 3902 |
LAST_BLOCK_G |
21 |
# 4001 … # 4021 |
LAST_BLOCK_ADDRESS |
26 |
# 4101 … # 4126 |
LAST_TARGET_POS |
NAXES |
# 5001… |
MACHINE_POS |
NAXES |
# 5021… |
MACHINE |
NAXES |
# 5021… |
G53 |
NAXES |
# 5021… |
WORK_POS |
NAXES |
# 5041… |
WORK |
NAXES |
# 5041… |
SKIP_POS |
NAXES |
# 5061… |
PROBE |
NAXES |
# 5061… |
TOOL_OFFSET |
20 |
# 5081 … # 5100 |
G52 |
NAXES |
# 5201… |
G54 |
NAXES |
# 5221… |
G55 |
NAXES |
# 5241… |
G56 |
NAXES |
# 5261… |
G57 |
NAXES |
# 5281… |
G58 |
NAXES |
# 5301… |
G59 |
NAXES |
# 5321… |
TOOL_TBL_FEED_TIMERS |
100 |
# 5401 … # 5500 |
TOOL_TBL_TOTAL_TIMERS |
100 |
# 5501 … # 5600 |
TOOL_TBL_LIFE_LIMITS |
100 |
# 5601 … # 5700 |
TOOL_TBL_LIFE_COUNTERS |
100 |
# 5701 … # 5800 |
TOOL_TBL_LIFE_MAX_LOADS |
100 |
# 5801 … # 5900 |
TOOL_TBL_LIFE_LOAD_LIMITS |
100 |
# 5901 … # 6000 |
NGC_CF |
1 |
# 6198 |
G154_P1 |
NAXES |
# 7001… |
G154_P2 |
NAXES |
# 7021… |
G154_P3 |
NAXES |
# 7041… |
G154_P4 |
NAXES |
# 7061… |
G154_P5 |
NAXES |
# 7081… |
G154_P6 |
NAXES |
# 7101… |
G154_P7 |
NAXES |
# 7121… |
G154_P8 |
NAXES |
# 7141… |
G154_P9 |
NAXES |
# 7161… |
G154_P10 |
NAXES |
# 7181… |
G154_P11 |
NAXES |
# 7201… |
G154_P12 |
NAXES |
# 7221… |
G154_P13 |
NAXES |
# 7241… |
G154_P14 |
NAXES |
# 7261… |
G154_P15 |
NAXES |
# 7281… |
G154_P16 |
NAXES |
# 7301… |
G154_P17 |
NAXES |
# 7321… |
G154_P18 |
NAXES |
# 7341… |
G154_P19 |
NAXES |
# 7361… |
G154_P20 |
NAXES |
# 7381… |
PALLET_PRIORITY |
100 |
# 7501 … # 7600 |
PALLET_STATUS |
100 |
# 7601 … # 7700 |
PALLET_PROGRAM |
100 |
# 7701 … # 7800 |
PALLET_USAGE |
100 |
# 7801 … # 7900 |
ATM_ID |
1 |
# 8500 |
ATM_PERCENT |
1 |
# 8501 |
ATM_TOTAL_AVL_USAGE |
1 |
# 8502 |
ATM_TOTAL_AVL_HOLE_COUNT |
1 |
# 8503 |
ATM_TOTAL_AVL_FEED_TIME |
1 |
# 8504 |
ATM_TOTAL_AVL_TOTAL_TIME |
1 |
# 8505 |
ATM_NEXT_TOOL_NUMBER |
1 |
# 8510 |
ATM_NEXT_TOOL_LIFE |
1 |
# 8511 |
ATM_NEXT_TOOL_AVL_USAGE |
1 |
# 8512 |
ATM_NEXT_TOOL_HOLE_COUNT |
1 |
# 8513 |
ATM_NEXT_TOOL_FEED_TIME |
1 |
# 8514 |
ATM_NEXT_TOOL_TOTAL_TIME |
1 |
# 8515 |
TOOL_ID |
1 |
# 8550 |
TOOL_FLUTES |
1 |
# 8551 |
TOOL_MAX_VIBRATION |
1 |
# 8552 |
TOOL_LENGTH_OFFSETS |
1 |
# 8553 |
TOOL_LENGTH_WEAR |
1 |
# 8554 |
TOOL_DIAMETER_OFFSETS |
1 |
# 8555 |
TOOL_DIAMETER_WEAR |
1 |
# 8556 |
TOOL_ACTUAL_DIAMETER |
1 |
# 8557 |
TOOL_COOLANT_POSITION |
1 |
# 8558 |
TOOL_FEED_TIMER |
1 |
# 8559 |
TOOL_TOTAL_TIMER |
1 |
# 8560 |
TOOL_LIFE_LIMIT |
1 |
# 8561 |
TOOL_LIFE_COUNTER |
1 |
# 8562 |
TOOL_LIFE_MAX_LOAD |
1 |
# 8563 |
TOOL_LIFE_LOAD_LIMIT |
1 |
# 8564 |
THERMAL_COMP_ACC |
1 |
# 9000 |
THERMAL_SPINDLE_COMP_ACC |
1 |
# 9016 |
GVARIABLES3 |
1000 |
#10000 … #10999 |
INPUTS1 |
256 |
#11000 … #11255 |
OUTPUT1 |
256 |
#12000 … #12255 |
FILTERED_ANALOG1 |
13 |
#13000 … #13012 |
COOLANT_LEVEL |
1 |
#13013 |
FILTERED_ANALOG2 |
50 |
#13014 … #13063 |
SETTING |
10000 |
#20000 … #29999 |
PARAMETER |
10000 |
#30000 … #39999 |
TOOL_TYP |
200 |
#50001 … #50200 |
TOOL_MATERIAL |
200 |
#50201 … #50400 |
CURRENT_OFFSET |
200 |
#50601 … #50800 |
CURRENT_OFFSET2 |
200 |
#50801 … #51000 |
VPS_TEMPLATE_OFFSET |
100 |
#51301 … #51400 |
WORK_MATERIAL |
200 |
#51401 … #51600 |
VPS_FEEDRATE |
200 |
#51601 … #51800 |
APPROX_LENGTH |
200 |
#51801 … #52000 |
APPROX_DIAMETER |
200 |
#52001 … #52200 |
EDGE_MEASURE_HEIGHT |
200 |
#52201 … #52400 |
TOOL_TOLERANCE |
200 |
#52401 … #52600 |
PROBE_TYPE |
200 |
#52601 … #52800 |
11 Why:
Waiting for a replacement stylus and tool setter to arrive, I wondered if were possible to replace the hundreds of inscrutible lines of Hass WIPS Renishaw G-code with just a few lines of Python?
Maybe.
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