Re: Z drops below 0 when return to X0 Y0 at end of job. Is this a Mach3 issue, or oth
Originally Posted by
AmplifiedLight
Hi all,
I'm using a 4.25" long 3/8" end mill for clearing thick stock. At the beginning of the job when the rapid movement to the start position happens, the z drops down below stock 0 and cuts it's way to the start point. At the end of the job it does the same when it returns to home. I fixed the issue at the beginning by adding a G1 Z0.5 command before the move to the starting point, but at the end of the job, adding the same command before the move to home doesn't work and the tool moves down below 0 and cuts it's way home. I'm using a Chinese 3 axis 1325 cnc router with Xulifeng Mach3 motion control card, Mach3 on Windows 10, generating toolpaths in Fusion 360. This is the only tool that I have this problem with. I'm milling 3" foam and I set z0 using the paper method since the probe won't fit under the tool. About 3" from collet to end of tool. It's dropping down about .8" below stock 0. Does this have something to do with tool offset compensation? Does Mach3 have a limit to how long a tool it can compensate for? It runs the rest of the program fine with appropriate retract and clearance heights. Anyone have any ideas?
End of program:
X16.6695 Y23.3403 Z-0.4923
X16.669 Y23.3397 Z-0.4878
X16.6688 Y23.3395 Z-0.4833
Z0.6
G28 G91 <<<<< G28G91Z0
G90 <<<Remove this
G1 Z0.5 <<<Remove this
G28 G91 X0. Y0. <<<<<< X0 Y0
G90 <<<Remove this
M30
Switch back and forth with the absolute and increment mode, in this case is unnecessary. I like to kept program in absolute so at the begin of the problem, the safe line is G20G17G90G80G40 to cancel pretty much everything out.
- - - Updated - - -
Originally Posted by
AmplifiedLight
Hi all,
I'm using a 4.25" long 3/8" end mill for clearing thick stock. At the beginning of the job when the rapid movement to the start position happens, the z drops down below stock 0 and cuts it's way to the start point. At the end of the job it does the same when it returns to home. I fixed the issue at the beginning by adding a G1 Z0.5 command before the move to the starting point, but at the end of the job, adding the same command before the move to home doesn't work and the tool moves down below 0 and cuts it's way home. I'm using a Chinese 3 axis 1325 cnc router with Xulifeng Mach3 motion control card, Mach3 on Windows 10, generating toolpaths in Fusion 360. This is the only tool that I have this problem with. I'm milling 3" foam and I set z0 using the paper method since the probe won't fit under the tool. About 3" from collet to end of tool. It's dropping down about .8" below stock 0. Does this have something to do with tool offset compensation? Does Mach3 have a limit to how long a tool it can compensate for? It runs the rest of the program fine with appropriate retract and clearance heights. Anyone have any ideas?
End of program:
X16.6695 Y23.3403 Z-0.4923
X16.669 Y23.3397 Z-0.4878
X16.6688 Y23.3395 Z-0.4833
Z0.6
G28 G91 <<<<< G28G91Z0
G90 <<<Remove this
G1 Z0.5 <<<Remove this
G28 G91 X0. Y0. <<<<<< X0 Y0
G90 <<<Remove this
M30
Switch back and forth with the absolute and increment mode, in this case is unnecessary. I like to kept program in absolute so at the begin of the problem, the safe line is G20G17G90G80G40 to cancel pretty much everything out.
The best way to learn is trial error.