CNC Milling G Code List For Beginners
Download and print this nice large print CNC Milling G Code List
I always begin my training sessions by telling my students not to remember anything I say.
This sounds completely stupid and my excuse is it wasn’t my idea to say it.
About ten years ago I worked in France. After about a year and it seemed obvious that I would need to speak to people to order “Fish n Chips” and stuff like that.
Anyway I got these CD’s to teach me French and the bloke (can’t remember his name) started off by telling you not to remember anything he told you.
I think there is a bit of reverse psychology going on but the main idea is that you understand not remember. It didn’t work for me because I still managed to completely fuck up the language. Not realizing French Canadians speak differently to native Frenchmen (I was working for Bombardier) . Anyway I asked this bloke, in French, to “come with me”. I can’t remember what it is in French and after all the bloke on the CD had specifically told me not to remember.
Anyway turns out this had a sexual connotation and made me the complete laughing stock everywhere I went from then on. (I’ll let you do the maths on that one.)
When it comes to CNC Programming the idea of not remembering loads of G Codes is really important. Truth is you only need a few and it’s all about understanding what they do.
For Example I want to drill a hole.
You start writing a program to drill some holes.
From your training you know that there is a cycle that drills holes.
You understand how the cycle feeds the tool down to a depth and then it rapids out ready to do another.
You also know that if you keep adding more positions (X50. Y50.) it will keep drilling holes.
And… when you are sick of drilling holes there’s another G code to stops it.
What Are These G Codes?
So you just look em up on your CNC Milling G Code List.
G81 Drilling Canned Cycle
G80 Cancel Canned Cycle
Then you think “mmm I’m sure there’s one that pecks the material out and breaks it up”
“Let me see… Ah this looks like the one
G73 Peck Drilling
Type up or print this list in nice big letters and stick it to the side of your machine
CNC Milling G Code List
G00 Move at Rapid speed
G01 Feed in a Straight Line
G02 Clockwise Arc
G03 Counter Clockwise Arc
G04 Time Dwell
G28 Return Axis to Home
G41 Cutter Compensation Left
G42 Cutter Compensation Right
G40 Cancel Cutter Compensation
G43 Apply Tool Length Offset
G54 to G59 Work Offsets
G81 Drilling Cycle
G73 Peck Drilling
G83 Deep Hole Drilling Cycle
G84 Tapping Cycle
G80 Cancel All Canned Cycles
G90 Absolute Programming
G91 Incremental Programming