Two issues I can't figure out

[ShawnM]

Z should move to the top at the end of the job. Just edit your post processor to stop any unwanted moves or to send it to a specific position at the end of the job.

[cncsnw]

Shawn's text notwithstanding, if you have a knee mill with Z in the knee, then you should set home with the knee all the way down. I.e. with the maximum distance between the table and the spindle.

If your knee is moving up at the end of a cycle and crashing the tool, then either you have Z home set wrong (e.g. with the knee up); or you have your G28 position set wrong (e.g. with a negative value for Z); or your G codes are wrong (could not speculate without seeing them).

[ShawnM]

Sorry Marc, I assumed the quill/head moved via the motors and the knee was manual crank. He said he had a home switch on the Z axis. I wasn't thinking the Z was the knee. This is why I run a router and a plasma.

[specnaz]

OK, so we got the Z crashing into the table figured out, but still no answer as to why the graph in CNC12 is showing mirror opposite to what is actually being cut on the table...

[specnaz]

I have the a simialr issue. XYZ are all on the table with a stationary spindle. I have set my limit switches home to be X0 table all the way to the left. Y0 table all the way out toward the user, Z0 table all the way down. All my axis work fine when gicing manual commands and running the homing cycle.
My issue is that when i load a part to start milling its almost like all my axiz are reversed? the graph shows the diagram and how it is cutting but the table moves almost like a reverse image to how the graph shows.
Ive tried reversing the motor directions but that doesn't work, ive tried different cam files but the same thing happens. ??
can anyone suggest something?

Thanks
Steve

this is the same issue I'm having

[Gary Campbell]

That is because with a moving table (stationary spindle) the table movements are opposite of what a moving head does. With an XY zero in the lower left corner, the table should be all the way to the right AND away from the operator. You will note that in this position the spindle is then in the lower left of the table

[specnaz]

That is because with a moving table (stationary spindle) the table movements are opposite of what a moving head does. With an XY zero in the lower left corner, the table should be all the way to the right AND away from the operator. You will note that in this position the spindle is then in the lower left of the table

Ok I understand now, is there a way to change this? I'm always struggling to find proper corner where it will actually start once I zero all my references , every time i click to start the cut i keep my finger on emergency start because I had it crash before due to unexpected direction of movement

[Gary Campbell]

Usually the fix is to reverse the direction of the motors and relocate the homing sensors to accommodate the opposite travel direction

[specnaz]

Usually the fix is to reverse the direction of the motors and relocate the homing sensors to accommodate the opposite travel direction

what I find confusing though is if I try to jog it, specially now with cross jog in new 5.0 version, it seems like everything moves as it should, but when I put an actual job in , it reverses everything on the screen , I think that for machines that have moving table rather then the spindle, there should be a setting in CNC12 to have it set so it fits machine setup eh?

[tblough]

Machine coordinate systems are not arbritrary. They follow a standard so that all similar machines work alike.

https://centroidcncforum.com/viewtopic.php?f=64&t=3638