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Mach4 General Discussion / Z-position chaning mid program
« on: August 13, 2023, 08:12:24 AM »
Hi everybody,
I have encountered an issue which almost killed my Z-axis assembly, hopefully someone can help me out.
I have built my own CNC router using an ESS, MB3 breakout board and cl steppers from stepperonline. The problem occurred as follows i was running the attached gcode file and it started fine but after a few minutes it started to plunge too deep into the part so i stopped the machine and noticed that the Z0 had shifted down about 15mm, nothing seemed wrong mechanically and the z axis still moved fine and without losing position. To isolate the problem i ran the program again without an endmill installed and sure enough after a few minutes the machine moved down way too far, the Z0 had shifted down 40mm. Does anyone have a suggestion as to what the problem could be?
other possibly relevant info:
-the stepper drivers are not throwing an error
-none of the cables have come loose
-the Z-axis assembly moves freely without (significant)backlash or binding
-on the dry run the spindle was off so no interference from that cable
-Z-axis does not need to move faster than it is capable of
I have encountered an issue which almost killed my Z-axis assembly, hopefully someone can help me out.
I have built my own CNC router using an ESS, MB3 breakout board and cl steppers from stepperonline. The problem occurred as follows i was running the attached gcode file and it started fine but after a few minutes it started to plunge too deep into the part so i stopped the machine and noticed that the Z0 had shifted down about 15mm, nothing seemed wrong mechanically and the z axis still moved fine and without losing position. To isolate the problem i ran the program again without an endmill installed and sure enough after a few minutes the machine moved down way too far, the Z0 had shifted down 40mm. Does anyone have a suggestion as to what the problem could be?
other possibly relevant info:
-the stepper drivers are not throwing an error
-none of the cables have come loose
-the Z-axis assembly moves freely without (significant)backlash or binding
-on the dry run the spindle was off so no interference from that cable
-Z-axis does not need to move faster than it is capable of