hello all, I have had my machine (3040t) for about 2 months, and now when i load a file into Mach 3 in the display window you dont see the pic that is going to be made. instead you see a very small version in the box, and when the program starts is only moves the machine about an 1/8 of an inch.

this may seem very vague, and im sorry for that.. still learning

Eric

Hi,
sounds like your machine is interpreting the Gcode in mm when the Gcode was composed in inches.
That makes the part come out 1/25th of the correct size.

Read up about G20/G21

Craig

i have read up on g20-G21, just not sure where i should go from there. Everything that i have made has been in inches (G-20) just not sure where i go to fix this issue.

thank you for you patients.

Eric

I am having problems as of late with the size of my work, for the last 2 months everything has been cutting really good now is cutting everything really small. i have been told it has something to do with G20, G21 g-code but have no idea how to fix the problem.

here is the start of one of my cuts:

G20 G90 G40

(follow path 1)
G0 Z0.5
T0 M6
G17
M3
G0 X-1.4332 Y-1.3777
G1 Z-0.0016 F30
G2 X-1.4372 Y-1.3706 I0.029 J0.0213 F60
G2 X-1.4468 Y-1.3458 I0.3526 J0.1512
G2 X-1.4551 Y-1.3204 I0.592 J0.2065
G2 X-1.4631 Y-1.2918 I0.7442 J0.2245
G3 X-1.475 Y-1.2506 I-0.8318 J-0.2166
G3 X-1.4831 Y-1.2284 I-0.248 J-0.078
G3 X-1.494 Y-1.2084 I-0.1018 J-0.0425
G3 X-1.4998 Y-1.204 I-0.0094 J-0.0064
G3 X-1.5056 Y-1.2055 I-0.0017 J-0.0053
G3 X-1.5137 Y-1.2185 I0.0273 J-0.0261
G3 X-1.5187 Y-1.2357 I0.1152 J-0.0425
G3 X-1.525 Y-1.2718 I0.5052 J-0.1066


im at a loss

Hi,
if you put a line in your Gcode file right at the top G20. Then try running the file.

Craig

hello Craig,

i tried adding G20 to the top of the code and got the same results :/

here is what I have for the start of my code:

G20

G20 G90 G40

(follow path 1)
G0 Z0.5
T0 M6
G17
M3
G0 X0.1766 Y4.2419
G1 Z-0.025 F30
G3 X-0.4634 Y4.2397 I0.0692 J-115.6767 F60
G3 X-0.7585 Y4.2362 I0.1508 J-24.5929
G3 X-0.907 Y4.2326 I0.2237 J-12.337
G3 X-0.9847 Y4.2293 I0.1022 J-3.3855
G3 X-1.023 Y4.2269 I0.0989 J-1.8601
G3 X-1.0453 Y4.2249 I0.0465 J-0.6293
G3 X-1.0669 Y4.2217 I0.0332 J-0.3028
G3 X-1.0737 Y4.2197 I0.0058 J-0.032

hope this helps a little lol

Hi,
the second line of Gcode is:
G20 G90 G40
Note there is a G20 already in it. Therefore your additional G20 which preceeds it is not required, it wont do any harm, G20/G21 are 'modal', they stay in
effect until deliberately changed.

Can you post the complete Gcode file as an attachment ( use "Additional Option....' just to the left of the text input panel).

Craig

i have attached the file

just FYI i have tried about 10 dif files and the same results

Hi,
I downloaded the file and opened with Mach3 and it seems to work. I end up with a roughly rectangular part about 3 inches by 4 inches.
I've attached a pic of the part in my CNC viewer.

Craig