Disable mach3 work offset

[inoycavalera]

hi..i'm very new in cnc mill and actually i'm building a mini 3 axis cnc machine with mch3 software. my question is ...is it possible to disable the work offset of mach3? so it will always use the absolute machine coordinate.

Thank you

[ger21]

Just go to the offsets page and enter zero's for the offsets, and save.
Be aware that zeroing an axis will add an offset to that axis.

What I do is use the Home Offsets in Config > Homing Limits to specify my 0,0 location. After I home the machine, it's ready to run with a permanent 0,0 location.

[inoycavalera]

is it mean every time you want to start machining, you move your machine to home position and reset the coordinate to zero?

[inoycavalera]

i tried to zero all the offset coordinate and absolute machine coordinate, but when i load a gcode and run it, the Z coordinate suddenly change to 50. how it can be?

Before run the program


When program running, after x & y reach the coordinate in the g-code, the z coordinate suddenly change to 50.


is there any think wrong with the gcode?
below is the gcode....
(BEGIN PREDATOR NC HEADER)
(MACH_FILE=3AXVMILL_MM.MCH)
(MTOOL T1 S1 D3.175 H127. DIAM_OFFSET 1 = 1.587)
(SBOX X0. Y0. Z-25.4 L81.204 W72.246 H0.)
(END PREDATOR NC HEADER)

%
O100
(PROGRAM NUMBER)
(PROGRAM NAME - BOBCAD1.NC)
(POST - MACH 3 MILL NO ATC METRIC)
(DATE - MON. 08/08/2011)
(TIME - 09:39PM)

N01 G21 G40 G49 G54 G80 G90 G91.1

(JOB 1 ENGRAVING)
(FEATURE ENGRAVE)

(N02 T1)
N03 S1497 M03
N04 G00 G90 G54 X45.294 Y69.74
N05 G43 H1 Z2.54 M08 ------> in this line the Z change to 50...
N06 G01 Z-1.27 F300.5544
N07 G03 X32.428 Y39.521 I10.91 J-22.494 F304.2574
N08 X60.115 Y22.554 I23.776 J7.725
N09 X78.908 Y36.78 I-3.911 J24.692
N10 X67.554 Y69.521 I-22.704 J10.466
N11 X45.294 Y69.74 I-11.35 J-22.275
N12 G00 Z2.54
N13 M09
N14 M05
N15 M02

(END OF PROGRAM)

N16 M30
%

[ger21]

G43 is a tool length offset, not a work offset.

If you don't want to use it, you'll need to remove that line of g-code.