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Last modified by writer on 2025/07/15 19:27
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1 For certain tasks (for example, PCB milling) it becomes necessary to scan the surface with subsequent correction of unevenness in Z.
2
3 A height map is prepared using a macro (show example below) and the G-code is modified based on this height map.
4
5 You can generate a G-code with new coordinates, for example, in the G-Code Ripper program.
6
7 {{code language="lua"}}
8 function m155()
9 local XWidth = 70
10 local YWidth = 50
11 local SafeZ = 3
12 local ProbeZ = -3
13 local StepX = 15
14 local StepY = 15
15 local Feed = 50
16 local TipHeight = 0
17 local ProbeFilename = "C:\\temp\\probe.txt"
18
19 PushCurrentDistanceMode()
20 PushCurrentMotionMode()
21
22 if (IsProbingPinConfigured()) then
23 -- open the file
24 file, msg = io.open(ProbeFilename, "w")
25
26 if (file == nil) then
27 DisplayMessage("Could not open probe output file ("..msg..")")
28 Stop()
29 return
30 end
31
32 ExecuteMDI("F "..Feed)
33 ExecuteMDI("G90 G38.2 Z-100")
34
35 -- set the current location to 0,0,0
36 ExecuteMDI("G92 X0Y0Z0")
37 ExecuteMDI("G0 Z"..SafeZ)
38
39 local direction = 0
40 for y = 0, YWidth, StepY do
41 if (direction == 1) then
42 direction = 0
43 else
44 direction = 1
45 end
46
47 for x = 0, XWidth, StepX do
48 if (direction == 1) then
49 ExecuteMDI("G0 X"..x.." Y"..y.." Z"..SafeZ)
50 else
51 ExecuteMDI("G0 X"..(XWidth - x).." Y"..y.." Z"..SafeZ)
52 end
53
54 ExecuteMDI("G38.2 Z"..ProbeZ)
55 LogCurrentPos(TipHeight)
56 ExecuteMDI("G0 Z"..SafeZ)
57 end
58 end
59
60 if (direction == 1) then
61 ExecuteMDI("G0 X"..XWidth.." Y"..YWidth.." Z"..SafeZ)
62 else
63 ExecuteMDI("G0 X".."0".." Y"..YWidth.." Z"..SafeZ)
64 end
65
66 local HighZ = 5
67 ExecuteMDI("G0 Z"..HighZ)
68 ExecuteMDI("G0 X0Y0")
69
70 file:close()
71 else
72 DisplayMessage("Probe input is not configured")
73 return
74 end
75 end
76
77 function LogCurrentPos(tipHeight)
78 local CurrX = AxisGetPos(Axis.X)
79 local CurrY = AxisGetPos(Axis.Y)
80 local CurrZ = AxisGetPos(Axis.Z)
81
82 local fmt = "%.5f"
83 file:write(string.format(fmt, CurrX)..","..string.format(fmt, CurrY)..","..string.format(fmt, CurrZ - tipHeight), "\n")
84 end
85 {{/code}}
86
87 **[[Download macro>>attach:M155.pm]]**