program exceeds machine maximum on axis Z

I am new to this. I am trying to do a bit of CNC work, this is my second attempt at a test piece as I learn CAM/CNC (first piece went fine).

When I try and run the program on the second piece I get the above error.

When I try and run it anyway it moves to the start and then stalls where the next call / line is a plunge into the work.



At this point I have no idea why it will not rough out the piece.



I have 70mm of movement on Z and the piece seems to be about 59mm so I cant fathom why this operation will not run.

fusion360 screenshot



simulation

line 14 is N50 G43 Z15 H1

it halts here.

I have run a simulation carefully watching the 'cut', it looks fine to me so maybe I have linuxcnc setup wrong?



When its finished its looking just like I expected it to look as a end result.

N50 G43 Z15. H1

So looking at some googling its suggesting? well I dont know its almost like a bug? "forums.autodesk.com/t5/fusion-360-comput...me-code/td-p/6723489"

its waiting for a tool change?

totally lost now.

%
(1001)
(SIMPLE TEST PIECE CAM SINGLE OPERATION.)
(T1 D=6. CR=0. - ZMIN=-38.498 - FLAT END MILL)
N10 G90 G94 G17 G91.1
N15 G21
N20 G53 G0 Z0.
(ADAPTIVE2)
N25 M9
N30 T1 M6
N35 S15000 M3
N40 G54
N45 G0 X-4.901 Y65.641
N50 G43 Z15. H1
N55 G0 Z5.
N60 Z0.6
N65 G1 Z0. F1000.
N70 Z-2.
N75 G3 X-2.994 Y62.948 I13.382 J7.453
N80 G1 X-2.747 Y62.687
N85 X-2.529 Y62.467
N90 X-2.394 Y62.334
N95 X-2.367 Y62.31
N100 X-2.215 Y62.482
N105 X-2.048 Y62.704
N110 X-1.867 Y62.989
N115 X-1.675 Y63.356
N120 X-1.471 Y63.833
N125 X-1.258 Y64.47

Ok this is to do with clearance height I think? The work piece is 68mm tall and I only have 70mm max movement. So that Z15 is move up to a safe height?

gzcwnk wrote:

Ok this is to do with clearance height I think? The work piece is 68mm tall and I only have 70mm max movement. So that Z15 is move up to a safe height?

It looks like you have answered your own question. If the part is 60mm and you only have 70mm in Z height . Then you have touched off in Z you cannot move to Z 15 as that would be more than 70mm.

Yes I ran the piece last night til 11pm went fine....it is indeed a movement to the safe moving height.

Sorry you got to see my thought process!