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http://www.craftycnc.com/touch-probes/

http://www.ebay.com/itm/171912530881

http://meshlab.sourceforge.net/

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Touch_Probe

http://www.timeguy.com/cradek/01262579508

http://lab.whitequark.org/notes/2014-07-06/g38-probing-workpieces-in-linuxcnc/

http://www.scorchworks.com/Blog/auto-probing-with-g-code-ripper/

http://www.scorchworks.com/Gcoderipper/gcoderipper.html

LinuxCNC is distributed with gridprobe.ngc and smartprobe.ngc

( Rectangular Probing ) ( ) ( This program repeatedly probes in a regular XY grid and writes the ) ( probed location to the file 'probe-results.txt' in the same directory ) ( as the .ini file )

(Configuration section) G20 (Inches) F4 (probe speed)

1. 1=0 (X start)
2. 2=.25 (X increment)
3. 3=13 (X count)

1. 4=0
2. 5=.25
3. 6=5 (Y count)

1. 7=.1 (Z safety)
2. 8=-.5 (Z probe)

(End configuration section)

(PROBEOPEN probe-results.txt)

1. 9=0 #10=0

G0Z#7 O1 while [#9 lt #6]

   #10=0
   G0 Y[#4+#5*#9]
   O2 while [#10 lt #3]
       O3 if [[#9/2] - fix[#9/2] eq 0]
           G0X[#1+#2*#10]
       O3 else      
           G0X[#1+#2*[#3-#10-1]]
       O3 endif
       G38.2Z#8
       G0Z#7
       #10=[#10+1]
   O2 endwhile
   #9=[#9+1]

O1 endwhile

(PROBECLOSE) G0Z#7 G0X#1Y#4 M2