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Mach4 General Discussion / M6 Script Problem
« on: May 19, 2020, 10:10:01 AM »
I have written the simplest possible script to position the tool over a touch plate at machine zero, capture the Z, change to a new tool, and update the Z axis for the new tool.
This code runs just fine, but Mach exhibits bizarre behavior. After the code runs the Z work zero can be off by anywhere between a few hundreths of a mm to 50mm. This happens even if you leave the same tool in before and after the change.
It seems like there is a bug somewhere in Mach4. I don't see any line in this code that could possibly cause this behavior. Also, the touch screen hangs, and this code hangs if I run either of them after a fresh boot of Mach4. After Mach4 loads I need to load a GCode file and start it before the touch screen or this script will run properly.
Very frustrating.
This code runs just fine, but Mach exhibits bizarre behavior. After the code runs the Z work zero can be off by anywhere between a few hundreths of a mm to 50mm. This happens even if you leave the same tool in before and after the change.
Code: [Select]
function m6()
local inst = mc.mcGetInstance()
local selectedTool = mc.mcToolGetSelected(inst)
local currentTool = mc.mcToolGetCurrent(inst)
local MoveDistance = -15
local MoveSpeed = 15
local TouchZ
local CycleWait
if selectedTool == currentTool then
mc.mcCntlSetLastError(inst, "Current tool same as selected tool. No tool change required.")
else
mc.mcCntlSetLastError(inst, "Tool Change")
mc.mcCntlGcodeExecuteWait(inst,"G90 G53 G0 Z0.0 X0.0 Y0.0")
CycleWait = mc.mcCntlWaitOnCycleStart(inst, "Position the tool less than 1/2 inch over the touch plate and click Start", 1000000)
mc.mcCntlGcodeExecuteWait(inst,"G91 G31 Z"..MoveDistance.." F"..MoveSpeed)
TouchZ = mc.mcAxisGetPos(inst, 2)
mc.mcCntlGcodeExecuteWait(inst,"G90 G53 G0 Z0.0")
CycleWait = mc.mcCntlWaitOnCycleStart(inst, "Change the tool, reposition it over touch plate and click Start", 1000000)
mc.mcCntlGcodeExecuteWait(inst,"G91 G31 Z"..MoveDistance.." F"..MoveSpeed)
mc.mcAxisSetPos(inst, 2, TouchZ)
mc.mcCntlGcodeExecuteWait(inst,"G90 G53 G0 Z0.0")
mc.mcToolSetCurrent(inst, selectedTool)
CycleWait = mc.mcCntlWaitOnCycleStart(inst, "Turn the spindle on, click cycle start, and we are cutting.", 1000000)
mc.mcCntlSetLastError(inst, "Tool Change Completed.")
end
end
if (mc.mcInEditor() == 1) then
m6()
endIt seems like there is a bug somewhere in Mach4. I don't see any line in this code that could possibly cause this behavior. Also, the touch screen hangs, and this code hangs if I run either of them after a fresh boot of Mach4. After Mach4 loads I need to load a GCode file and start it before the touch screen or this script will run properly.
Very frustrating.