Hello
I have been reading along on this mailing list for a few weeks now
and playing with Linuxcnc Axis simulator in my free time. Both have been
very informative and I have learned a lot. There are two items I was
wondering if I could get a comment on.
#1 Dose any one have a python script or other program that will
calculate estimated machine time for a .ngc file. PyCam will give you an
estimate for the Gcode it generates. I have looked through the source
code and I cant find any thing. I have no programming back ground and
don't know what I am looking for witch dose not help;-)
#2 Can some one have a look at the following .ngc code with sub routine
and give me any suggestions or comments regarding the layout programming
logic ect. Please be ruthless I have no programming or CNC back ground;-)
thank for sharing,
Linden
%
; Cutoff sub V1.0
; Written by hand Linden
;
;Copyright GNU Public License V3)
;Credit - Igor Chudov, Original cutoff sub script
;I have hacked Igors original script to do what I needed and take all
responsibility for the messiness as I am not a programmer at all
;---------------------------------------------------------
; Not Production Tested !!!!! Feeds, depth of cut, and Speeds not set
;
; TO DO: Determine spindle direction requirements set actual speeds and
feeds
;-------------------------------------------------------
; Material
; - Aluminum
;
; Procedure:
; - Square off end of rough stock with multiple passes of end mill.
Cut in one direction only, pull back in x plane for return for next path.
;
; Tools:
; #4 1/2 end mill,
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Subroutines used in this script:
;
o<cutoff> sub
#<width> = #1 (Width of part in Y)
#<depth> = #2 (milling depth, negative)
#<milld> = #3 (end mill diameter)
#<frate> = #4 (milling rate)
#<zstep> = #5 (Z step, positive, optional if 0 uses half end mill
diameter)
#<dir> = #6 (0 for X+ {right} end of material 1 for X- {left} end
of material)
#<Sspeed> = #7 (Spindle Speed)
#<extra> = [ #<milld>/2+0.01 ]; (Finnish cutting width of cut plus 1/2
cuter diameter plus 0.01 )
#<z> = 0
G91 (Set to relative Coordinates)
G0 Y[-#<extra>]
F #<frate>
o<if1> if [ #<dir> EQ 0]
#<diroffset1> = [ -1 ]
#<diroffset2> = [ 1 ]
M3 S[#<Sspeed>]
o<if1> else
#<diroffset1> = [ 1 ]
#<diroffset2> = [ -1 ]
M4 S[#<Sspeed>]
o<if1> endif
o<if2> if [#<zstep> EQ 0]
#<zstep> = [ #<milld>/2 ]
o<if2> endif
o<loop1> while [ 1 ]
#<z> = [#<z> - #<zstep>]
#<zmove> = #<zstep>
o<if3> if [#<z> LT #<depth>]
#<zmove> = [ #<zmove> - [#<depth> - #<z>] ]
#<z> = #<depth>
o<if3> endif
G0 Z[ -#<zmove> ]
o<if4> if [ #<dir> ]
G1 Y[[#<width> + 2*#<extra>]*[#<diroffset1>]]
#<dir> = 0
o<if4> else
X[[#<diroffset1>]*[#<extra>]]
G0 Y[-[#<width> + 2*#<extra>]*[#<diroffset1>]]
X[[#<diroffset2>]*[#<extra>]]
#<dir> = 1
o<if4> endif
o<if5> if [ #<z> LE #<depth>]
o<loop1> break
o<if5> endif
o<loop1> endwhile
G0 Z[[-#<depth>]+[#<extra>]] (Withdraw to safe height start height plus
1/2 cutter diameter)
G4 P3 (Dwell for 1 second)
G90 (Set back to absolute Coordinates)
o<cutoff> endsub
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; Clear and set Machine Parameters:
G17 (Contour plane is XY Z = spindle)
G54 (Coordinate system 1 touch off zero not machine home)
G20 (All units in inches G21 mm)
G90 (Absolute Distances)
G40 (Cancel diameter comp)
G49 (Cancel length offset)
G80 (Cancel Canned cycles)
G94 (Feed/Minute mode)
;G64 Pn.n (Path Blending how dose this work what sould i put for
settings)
;;;;;;;;;;;;;;;;;;;;;
; Start message for operator
(MSG, Cut off sub will be run twice cutting both ends of bar in fixture
1. Set fixture 1 in mill Part 0 reference is surface of material and
centre of centre hole. Tool 4 is 1/2 inch end mill Press pause button to
continue.)
;
;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;
;Tool change and Program Start
M0 (Pause)
M6 T4 (Tool change tool 4)
G0 X-1.000 Y1.000 Z0.000 (Rapid to cut start position)
o<cutoff> call [2.00](Width of cut in Y) [-1.00](Total depth of
cut,negative number) [0.500](end mill diameter) [150](Feed speed)
[.125](Depth of cut each pass) [0](0 X+ right hand end 1 X- left hand
end) [1000] (Spindle Speed)
G0 X3.000 Y1.000 Z0.000 (Rapid to cut start position)
o<cutoff> call [2.00](Width of cut in Y) [-1.00](Total depth of
cut,negative number) [0.500](end mill diameter) [150](Feed speed)
[.125](Depth of cut each pass) [1](0 X+ right hand end 1 X- left hand
end) [1000] (Spindle Speed)
;;;;;;;;;;;;;;;;;
;End program and home
;;;;;;;;;;;;;;;;;
G28 (Return to reference point "HOME Position")
M2 (end program)
%
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