mach 3 z-axis plunging

[bjcnc]

everytime i start the cutting process no matter what the z depth is it plunges to the max depth which in turn either locks my mill up or takes the piece of wood with it any suggestions is it a set up issue or am i just missing something

[ger21]

Sounds like probably a G43 tool height compensation issue? Can you post the g-code, and let us know where it's plunging?

[bjcnc]

The router plunges at the very beginning of the cycle .The beginning of the g code is %
O0001(LION V.NC)
N1 G00 G17 G20 G40 G49 G80 G90
N2 T1 M6 (CONIC-F 1/8 - DEG 15 - FLAT 0.01 )
N3 G00 X0. Y0. M03
N4 G43H1 Z0.1 M8
N5 G01 Z-0.2 F20000 **** I think it is here
N6 X2.4167
N7 Y0.0139
N8 Y0.0249
N9 X0.
N10 Y0.0417
N11 Y0.0497
N12 X2.4167
N13 Y0.0746
N14 X0.
N15 Y0.0833
N16 Y0.0995
N17 X2.4167
N18 Y0.1111
N19 Y0.1244
N20 X0.
N21 Y0.1389
N22 Y0.1492
N23 X2.4167
N24 Y0.1667
N25 Y0.1741
N26 X0.
N27 Y0.199
N28 X2.4167
N29 Y0.2083
N30 Y0.2239
N31 X0.9167
N32 X0.9028 Z-0.1923
N33 X0.8889 Z-0.1765
N34 X0.875 Z-0.2

[ger21]

Couple questions.

Where is your Z zero set to?

What is the Z DRO position when it's plunging?

Why is the feedrate 20000?

Try changing

N4 G43H1 Z0.1 M8

to

N4 M8

and see if it still does it. If it does, it's the G43 tool length comp.

[bjcnc]

z zero is top of work piece. z dro reads -.2 when plunging, Tried your advice corrected feed rate to 60 and put in N4M8 Still plunges . How do I change G43 tool compensation length . thanks again

[jeffery71]

Under the Mach3 "config" "tool table" Menu do you have any tool offsets in there? If you are not using tool offsets everything should be "0"


You said that the DRO reads -.2 but the machine goes lower than that? Are you looking at Machine Cords in the DRO?




Jeff T.

http://www.3dcarvestudio.com