I'm looking for a decent G-Code tutorial. Preferably one for Mach 3. There
are a couple projects I want to do that I think it would just be easier to
write the raw g-code than to draw the picture in a CAD program, run it
through the CAM stuff I can afford and then go back and tweak it so it will
work. I was just going to write it line by line, but then I ran across a
reference to routines or subroutines that seemed to indicate you could do
reiterative work with Mach 3 compatible g-code.

I do not mind buying a book. I'm not looking for a freebie or a handout.

Specifically it seems to wasteful and confusing to repeat the same code over
and over to cut a pocket. It seems it would be a lot easier to increment Z
and go back to the same code instead.

"Bob La Londe" wrote:

I'm looking for a decent G-Code tutorial. Preferably one for Mach 3. There
are a couple projects I want to do that I think it would just be easier to
write the raw g-code than to draw the picture in a CAD program, run it
through the CAM stuff I can afford and then go back and tweak it so it will
work. I was just going to write it line by line, but then I ran across a
reference to routines or subroutines that seemed to indicate you could do
reiterative work with Mach 3 compatible g-code.

I do not mind buying a book. I'm not looking for a freebie or a handout.

Specifically it seems to wasteful and confusing to repeat the same code over
and over to cut a pocket. It seems it would be a lot easier to increment Z
and go back to the same code instead.

http://www.amazon.com/s/ref=nb_ss_gw...58-6&x=14&y=23

CNC Programming Handbook, 2nd Edition by Peter Smid

Wes

Specifically it seems to wasteful and confusing to repeat the same code
over
and over to cut a pocket. It seems it would be a lot easier to increment
Z
and go back to the same code instead.

You're talking about parametric programming. Pretty useful stuff. Look for
info on Fanuc Macro B. Here's one that cuts the teeth for a three jaw chuck
jaws:

;TEETH,ADJUST TRUE SOFT JAWS

%LAPPER = 0
%ZDEPTH = 0.5000

%START:
%COUNTER = 0
%ZDEPTH = %ZDEPTH + 0.025 *;DEPTH OF CUT FOR EACH PASS
%LAPPER = %LAPPER + 1

G92 X 0.00 Y 0.00 Z %ZDEPTH
G90
G00 X 0.000 Y -0.250 Z 0.00


%LOOP:
%COUNTER = %COUNTER + 1

G42 T 02
G01 X 0.008 Y 0.000 F 3.0
G01 X 0.122 Y 0.000
G03 X 0.096 Y 0.750 I -1.304 J 0.330
G01 X 0.000 Y 0.750
G02 X 0.008 Y 0.000 I -3.986 J -0.420
G01 X 0.008 Y -0.125
G01 G 40 X 0.2857 Y -0.25
G92 X 0.000 Y -0.25 Z 0.00

IF (%COUNTER LE 9) GOTO %LOOP

G54
G00 X 0.00 Y 0.00 Z 0.00

IF (%LAPPER LE 5) GOTO %START *;DO ALL TEETH 5 TIMES