function m6()
--Wine rack tool change
--This file assumes that you have G53 Y0 Z0 to be setup as the Y-offset distance from tools and the correct height for picking up/dropping a tool.

-----------Tool 1------------------Tool 2----------Tool3-------------Tool 4------
---------------------------------------------------------------------------------
-------------------------------Y Offset------------------------------------------
--                                                                             --
--                                                                             --
--                                                                             --
--                              Cutter Area                                    --
--                                                                             --
--                                                                             --
---------------------------------------------------------------------------------

----------Variables----------
local inst = mc.mcGetInstance() --Get the instance of Mach4

local ToolInColletSig = mc.ISIG_INPUT0 --These outputs/inputs will be configured by the user depending what outputs/inputs they have setup in Mach config.
local CloseColletSig = mc.OSIG_OUTPUT1

local hReg = 0
local CurrentTool = mc.mcToolGetCurrent(inst)
local NextTool = mc.mcToolGetSelected(inst)
local YOffsetDistance = 10.5 --THE USER WOULD NEED TO DEFINE THIS TO FIT THEIR MACHINE
local numtools = 4
-----------------------------
local ToolXPositions = {}
ToolXPositions[1] = 4.5 --random numbers, you would configure them to be your own measurements/add to them if you have more tools.
ToolXPositions[2] = 12
ToolXPositions[3] = 16
ToolXPositions[4] = 25

function ToolChange(NextTool)
	----------------INPUT CHECKING-----------------------------------
	---------Here we are checking to make sure that we can get all of the hReg's that we need, so that we don't start the code unless are of the outputs/inputs are configured.------
	if (NextTool > numtools) then--If this is true, then the tool is out of range.
		return "That tool does not exist", false
	end
		
	hReg = 0
	hReg = mc.mcIoGetHandle(inst, ToolInColletSig) 
	if hReg == 0 then
		return "Could not locate collet signal!", false
	end	
		
	hReg = 0
	hReg = mc.mcIoGetHandle(inst, CloseColletSig)
	if hReg == 0 then
		return "Could not locate close collet signal!", false
	end
	----------------END INPUT CHECKING-----------------------------------
	hReg = 0
	hReg = mc.mcIoGetHandle(inst, ToolInColletSig) 
	if hReg == 0 then
		return "Could not locate collet signal!", false
	end	
	local rc = mc.mcIoGetState(hReg)
	if rc == 1 then --If rc equals 1, then there is a tool in the chuck
		--Put the tool away.
		mcCntlGCodeExecuteWait(inst, "G53 Y0 Z0 X"..ToolXPositions[CurrentTool]) -- ".." concatenates the xposition to the gcode string
		if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
		--We are now at the offset line, and need to move the correct Y Distance so we can drop off the tool.
		mcCntlGCodeExecuteWait(inst, "G91 Y"..YOffsetDistance)
		if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
		--We now release the tool.
		hReg = 0
		hReg = mc.mcIoGetHandle(inst, CloseColletSig)
		if hReg == 0 then
			return "Could not locate close collet signal!", false
		end
		mc.mcIoSetState(hReg, 0) --Set the output low, so that the tool is released.
		
		mcCntlGCodeExecuteWait(inst, "G53 Y0 Z0")--Move back to the YOffset line
		if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
	else
		mcCntlGCodeExecuteWait(inst, "G53 Y0 Z0")--Move to the YOffset line
		if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
	end

	mcCntlGCodeExecuteWait(inst, "G53 Z0 X"..ToolXPositions[NextTool]) --Move to the XPosition of the tool you are wanting to load
	if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
	mcCntlGCodeExecuteWait(inst, "G91 Y"..YOffsetDistance) --We are now hovering over the tool we want
	if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
	
	hReg = 0
	hReg = mc.mcIoGetHandle(inst, CloseColletSig)
	if hReg == 0 then
		return "Could not locate close collet signal!", false
	end
	mc.mcIoSetState(ChuckReleaseHandle, 0) --Grab the tool by closing the chuck
	
	mc.mcToolSetCurrent(inst, NextTool) --Update mach with the new tool.
	mcCntlGCodeExecuteWait(inst, "G53 Y0 Z0")--Move back to the YOffset line
	if rc ~= mc.MERROR_NOERROR then return "Could not complete GCode motion", false end
	return "Success", true
end


local a, b = ToolChange(NextTool)
mc.mcCntlSetLastError(inst, tostring(a))--Prints the output of the tool change.
if(b == true) then
	mc.mcToolSetCurrent(inst, NextTool)
end

end



--This function is used to allow the debugging to be done in the mcLua editor
if (mc.mcInEditor() == 1) then
	dofile ("load_modules.mcs")
    m6()
    
end