[mactec54]

recently downloaded fusion 360 and trying to design and output gcode to use in DIY 3 axis router controlled by mach3. I elected the wcs with z axis pointing up, x pointing to right, and y axis to 90 countclock to x
The model orgin was lower left top corner., My router and 600mm y movement, 500mm x movement and 90mm of Z movement. both the x and y home negative, but z since zero represents top
of gantry and bottom is negative, it homes positive. When I load the gcode into mach3 software and commence a run, I get a software limit error. Being new to all this, I have tried both using
"in computer" and "in control" for tool compensation. Both appear to generate a block of G43 code that wants to raise the z axis enough to provoke z axis softlimit error. I use a touch plate and
until I feel more comfortable usually trick the z axis to be 2 inches off actual work surface for purpose of air cut. I do select the mach3mill post processor to create the gcode. since I am new
to this whole process have a couple of questions. I work in MM in cad/cam and mach3..

Do you have a choice of letting fusion 360 by "in computer" tool compensation to simply load the gcode and and let mach3 follow the instructions which include he tool offsets without doing
any tool assignments in mach3.

Can the G43 command be remarked out or does this represent an elevation prior to rapid move to commence cutting

All indications are that I have my Z axis configured correct with zero at top, and -88mm at bottom of gantry travel ?

Any help with any of this would be greatly appreciated.
Anthony

A G43 is not your problem it is what is before the G43 that is the problem cut and paste the start of the program here and we may be able to see what is going on from that

G43 is you Z axis work Offset just as G54 is your X and Y work Offset

[kansaswoodrat]

I change the G54 to G56 and identify that location on mill somewhere near center of mill bed for nubie safety.

(SERVO_MOUNT_ADAPTER)
(FIRST FUSION 360)
(MACHINE)
( VENDOR HOMEMADE)
( MODEL DIY)
( DESCRIPTION GENERIC 3-AXIS)
(T1 D=3.175 CR=0. - ZMIN=-10.525 - FLAT END MILL)
N10 G90 G94 G91.1 G40 G49 G17
N15 G21
N20 G28 G91 Z0.
N25 G90

(BORE1)
N30 M5
N35 T1 M6
N40 S25000 M3
N45 G54
N50 G0 X5.404 Y52.667
N55 G43 Z16. H1

[mactec54]

I change the G54 to G56 and identify that location on mill somewhere near center of mill bed for nubie safety.

(SERVO_MOUNT_ADAPTER)
(FIRST FUSION 360)
(MACHINE)
( VENDOR HOMEMADE)
( MODEL DIY)
( DESCRIPTION GENERIC 3-AXIS)
(T1 D=3.175 CR=0. - ZMIN=-10.525 - FLAT END MILL)
N10 G90 G94 G91.1 G40 G49 G17
N15 G21
N20 G28 G91 Z0. Problem line change it to G0Z16. or a larger number to clear everything that when it moves to the X Y start position it can not hit anything with the tool
N25 G90

(BORE1)
N30 M5
N35 T1 M6
N40 S25000 M3
N45 G54
N50 G0 X5.404 Y52.667
N55 G43 Z16. H1

Line N20 is where your problem is remove it or just do a G0 Z16. Z30. or what ever number you want for your clearance plane

[dazp1976]

Line N20 is where your problem is remove it or just do a G0 Z16. Z30. or what ever number you want for your clearance plane

Yep.
I also always change mine to G0 Z30. Which is my safe Z height.