[trialanderror]

I want to cut a square pc out of a thin pc of aluminum and am trying to learn how to use the gcode repeat command. This is the code I have:

S1500 M3 S500
M98P1 L5
M30
O1
G1 Z-1
G1 Y-25
G1 X25
G1 Y0
G1 X0
M99

I need to go down 5 steps total, each repeat I want to go down Z-1, but it will only go down on the first run since it will make the machine/dro at Z-1. I need to trick the machine into thinking it is back at Z0 and then go down another 1 step during the repeats. What am I missing in this code ?

[Geof]

You make your Z motion an incremental (G91) move then go back to G90 for going around the square. Something like this:

S1500 M3 S500
G00 X0. Y0. Z1.
Z0.0
M98P1 L5
G00 Z1.
M30
O1
G91 G1 Z-1
G90 G1 Y-25
G1 X25
G1 Y0
G1 X0
M99

This positions the tool at the starting corner, moves it down to the top of the workpiece, increments down and does the square 5 times then retracts back to the clearance position and stops.

[trialanderror]

thanks so much, ill give that a try

[trialanderror]

I got the code working for the square but I am still a bit confused on how to do it for other code. This is my code:

N10 G90 G41 D1 F5 S1500 T01 M03 Z0.100;
N20 G54; (X 1.5 Y1)
N30 G00 X0 Y0
N40 Z-.05
N50 G01 Y0.1396384774068
N60 X0.0848076923076923
N70 X0.161240625 Y0
N80 X0.0848076923076923 Y-.1396384774068
N90 X-0.0848076923076923 Y-.1396384774068
N100 x-0.161240625 Y0
N110 X-0.0848076923076923 Y0.1396384774068
N120 X0 Y0 (go back to center of hole to avoid plunging)
N130 Z.1
N140 Z-.1
N150 Y0.1396384774068
N160 X0.0848076923076923
N170 X0.161240625 Y0
N180 X0.0848076923076923 Y-.1396384774068
N190 X-0.0848076923076923 Y-.1396384774068
N200 x-0.161240625 Y0
N210 X-0.0848076923076923 Y0.1396384774068
N220 X0 Y0 (go back to center of hole to avoid plunging)
N230 Z.1
N240 Z-.125
N250 Y0.1396384774068
N260 X0.0848076923076923
N270 X0.161240625 Y0
N280 X0.0848076923076923 Y-.1396384774068
N290 X-0.0848076923076923 Y-.1396384774068
N300 x-0.161240625 Y0
N310 X-0.0848076923076923 Y0.1396384774068
N320 X0 Y0 (go back to center of hole to avoid plunging)
N330 Z5 F500 (get tool out of way)

and this is what I want to do:

Run the code at 0,0,0 and then add +1 to Y and run the code 5 more times and then add +1 to X and repeat from the beginning 6 times.

I could do it manually but I'd have hundreds of lines of code and rather learn how to do it the neat way.

So there is no simple way to reset the zero's via gcode? If there was I could simply move to Y1 at the end of the code, reset everything to 0 and let it repeat itself. I would be suprised if mach3 doesn't have it. I mean I could probably program a macro to control my mouse and click the "zero Y" button in mach 3 and cycle start button everytime as well.

If mach3 doesn't allow a reset axis gcode, does it allow a code to increment lets say Y by 1 instead of going to Y1, so if your already at Y3, you can use a code to increment by Y1 and it will go to Y4 instead of having to type G01 Y4

Sorry if I confused anyone, still learning gcode. Got the handbook but I use it more as a sleeping pill than a book. Maybe I should start reading it in the morning

[txcncman]

It seems what you would rather do and what you should do are two different things. Crawl before you walk. Walk before you run. When learning manual G-code programming, the more times you practice now in the beginning, the better you will be later. Take too many short cuts now and you will pay for it later.

[Geof]

"I got the code working for the square"

Did you? In other words my contribution was of no assistance.



"Maybe I should start reading it in the morning"

Yes you should, before coming back here and wasting bytes asking trivial questions. I suggest you find out what G10 and G52 are for.

[CANDC]

It seems what you would rather do and what you should do are two different things. Crawl before you walk. Walk before you run. When learning manual G-code programming, the more times you practice now in the beginning, the better you will be later. Take too many short cuts now and you will pay for it later.

Do you ever comment with the intention of helping others, or are all your comments negative with the intention of boosting your ego?
It seems what you should comment and what you do comment are two different things! I have a feeling your an intelligent individual, please leave comments like this for high school kids!

[uli12us]

With all incremental programming, you mustcome back to the same point, from where you starting. If not, the machine shifts your zeropoint to the difference.
On a machine with a windows or similiar OS I prefer simply copying the contour and only insert the stepdepth.

[stewi]

As my German Bavarian colleague already mentioned the program pattern should be copied and pasted 5 times using an offset code G55, 56 and the pattern will repeat in the new offset location. See CNC G54 Zero Offset 1 Mill Milling Fanuc 0M G Codes
Out of curiosity, what programming tools are you using, which puts out numbers like yours with 13 digits?
Else, I recommend using some CAM software CamBam CNC Software which helps particular beginners, generating G-codes with much less effort.

[viking73]

With all incremental programming, you mustcome back to the same point, from where you starting. If not, the machine shifts your zeropoint to the difference.
On a machine with a windows or similiar OS I prefer simply copying the contour and only insert the stepdepth.

Not necessarily true. I have several programs where I don't bother to do this and have no adverse effects.

As always it's best to know your machine(s).

[maz43]

On a machine with a windows or similiar OS I prefer simply copying the contour and only insert the stepdepth.

I do that quite a bit.

It seems what you would rather do and what you should do are two different things. Crawl before you walk. Walk before you run. When learning manual G-code programming, the more times you practice now in the beginning, the better you will be later. Take too many short cuts now and you will pay for it later.

Words to live by IMHO.
A good start would be an editor with backplot function along with
the G&M code book for your CNC.
You type code and it backplots the path as you edit.
Play with that offline until you get the path right and there may be a cutter left after you try to run it in the mill.

Good luck,

Maz