Code reference
Thread Milling vs Tapping: The G-Code Difference
Tapping uses a canned cycle like G84; thread milling uses helical interpolation with G02 or G03 plus Z. Here is how the two approaches differ in code.
Lawrence Arya··5 min
Code reference
How to Program a Helix in G-Code (G02/G03 With Z)
A helix is just a circular arc with a simultaneous Z move. Add a Z value to a G02 or G03 and the tool spirals instead of staying flat. Here is how it works.
Lawrence Arya··5 min
Practice
Journeyman Machinist G-Code Test Questions: What to Expect
A journeyman-level G-code test goes beyond the basics into offsets, compensation, canned cycles, and reading a full program. Here is the deeper scope to study.
Lawrence Arya··5 min
Code reference
O-Word Subroutines in LinuxCNC: Examples and How They Work
LinuxCNC uses O-words, not Fanuc-style M98/M99, for subroutines, loops, and conditionals. Here is how o-sub, o-call, while, and if work, with examples.
Lawrence Arya··5 min