G-Code Primer Quick review G0 X__ Z__ rapid traverse G1 X__ Z__ F__ feed w/ linear interpolation G2/G3 X__ Z__ I__ K__ F__ circular interpolation G28 U0 W0 return home G50 S____ limit max speed G96/G97 S__ const. surf. speed/fixed speed G99/G98 feed per rev/feed per min
G21 metric units M3/M5 spindle on/off M8/M9 coolant on/off M0/M1/M30 stop/optional stop/program end G-Code Primer Quick review G blocks are modal G0 is rapid traverse mode, G1 is linear feed mode. G0
X10.0 Z20.0 Z10.0 X15.0 G1 F0.1 X4.5 Z12.0 M codes are on/off, only one per line M3 M8 G-Code Primer Variables:
#1-33 (local vars for macros) #100-199 (zeroed on power cycle) #500 to 999 (survive power cycle) Don't change vars above #1000: these are system variables. math: [#500 + 1.0] [#500 + #510] [#500 + [#510/2]]
G-Code Primer NEVER DO A TOOL CHANGE AWAY FROM HOME! (G28 U0 W0) ALWAYS PUT A DECIMAL POINT AFTER DIMENSIONAL NUMBERS (no decimal --> microns) USE ALL CAPS IN YOUR PROGRAM (lowercase gets dropped) DON'T GET OHS AND ZEROS MIXED UP. PROGRAM NUMBER STARTS WITH OH, NOT ZERO Planning a Program Critical dimensions
if your most critical dimension is an OD, do OD turning first if your most critical dimension is an ID, do boring first Machining ID Drill, rough bore (with end mill), finish bore (with boring bar) be very careful retracting from ID operations. It is too easy to crash a tool inside the part and break the tool. ID tools are much more expensive as well as much more fragile than OD tools. Planning a Program
Finish passes if your tolerance is tight or your part is slender (so it may deflect noticeably), run multiple finish passes at the same diameter. G-Code Looping & Branching Loops: WHILE [#500 GT #510] DO 1 G01 ... #500 = #500 0.2 END 1
Conditionals: IF [#502 LE #515] GOTO N100 ... N100 ROUGHING CYCLE - G71 Roughing Cycle - G72 Finishing Cycle - G70 G71/G70 Cycle (OD example) G0 T0101
Concave Arc Example - Drill center hole - Use boring tool to rough and finish cavity G0 X0.0 Z15.0 G2 X30.0 Z10.0 I0.0 K25.0 F0.2 Threading Cycle Threading requires multiple passes in perfect synchronization to reach final thread depth. Must make sure you are in
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