I noticed a common search in google is G80 G-code Fanuc.
CNC Machines use what we call canned cycles in a nutshell G80 cancels a canned cycle.
What is a canned Cycle?
To be honest I think it is a funny choice of words “Canned Cycle”.
My guess would be that all the information to drill a hole would be kept together in a “Tin Can” to use whenever you want.
I made this…….
First of all we program the cycle this is a G81:
G81 G98 Z-10. R1.5 F200. X55. Y55. F250.
The machine will move to the position X55. Y55. then it will rapid to 1.5mm above the part (this is the R1.5). It will then feed down to Z-10. at a feed-rate of 250 mm per minute F250.
Finally it will use rapid to come out of the hole.
Joking aside please don’t be arsed to learn a load of M Codes you will probably never use.
Well Commented Programs
Try to put M Code descriptions in your program. That way you won’t need to keep looking them up. A part transfer on a CNC Lathe is a good example, there are an absolute shit load of em.
They are everywhere. If you put a meaning to each one in brackets it will make proving the program out really easy. Oh and if you have a CAM system then change your post processor to output them for you.
M11 (OPEN CHUCK)
M10 (OPEN CHUCK)
etc etc
I had a boss once who actually learnt sines and cosines of angles.
Cosines of Angles
Holy shit I mean it’s impressive and I must add in 1975 it was actually worth doing because we didn’t even have calculators.
Hope you enjoyed reading my article on CNC Milling M Codes.
Please remember that it keeps me occupied and while I’m writing these articles I am not holding you up in the supermarkets queue trying to find a coupon for 10p off my incontinence briefs.
This is a short video that covers Flatland Finishing and Intermediate Slices. You may have forgotten you can do this or maybe you didn’t know it existed. Please add comments and request any tutorial videos you may want.
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Fanuc Display (Relative Position) is used only by the operator.
You can reset Fanuc Display (Relative Position) just like you would on a manual machine with a DRO. So use it for setting or even measurements. One thing to remember is it will not retain it’s position when you turn the machine off. The control in the video is a Fanuc 18i on a big vertical lathe but all other Fanuc controls are similar.
This is a video explaining cutter compensation in CNC programming.
You will come across various terms to describe this such as:
Tool cutter comp.
CNC cutter comp.
G41 G42 cutter compensation.
Cutter diameter compensation.
Cutter radius compensation.
Heidenhain RL RR.
Cutter compensation is referred to as cutter diameter compensation and cutter radius compensation
Haas cutter compensation, Fanuc cutter compensation and Mazak cutter compensation all work in the same way.
Although Heidenhain cutter compensation or Heidenhain cutter comp looks different. In the programme it functions in exactly the same way.
In the parameters or settings of your control you can set up your system to use the radius or the diameter of your cutting tool.
This means that when you input the data for your cutting tool in your offset table you can use the diameter or the radius of the tool. This depends on your settings.
When people talk about cutter compensation G code they may say “cutter comp G code” it’s often shortened.
(Cutter compensation G code)
The G codes used in this video are:
G41 cutter compensation left
G42 cutter compensation right
G40 G code to cancel cutter compensation
This Video shows you :
How to program G41.
How to program G42.
CNC cutter compensation examples.
Cutter compensation Heidenhain style.
Heidenhain RL RR.
We always recommend that you climb mill so you will be using G41 most of the time.
Milling the outside of a square using G41.
Milling the inside of a square using G41.
Milling the inside of a square using G42 (should you want to conventional mill).
Milling the outside of a square using G42 (should you want to conventional mill)
The rules when using compensation on a CNC Milling machine.
This is simple on a square sided figure or a simple radius. Anything more complex and it’s a nightmare.
I just heard some smart arse say “Ah well my CAD system takes care of that”.
So it should my friend but, and there is a but:
What will you do when your cutter wears?
What if you want to use a different size cutter?
The cutter may not run true.
What if the cutter is not exactly size?
In the old days of paper tape and Corned Beef we as programmers would write several programmes.
This was so that we could re-grind the milling cutters in fixed increments. A different programme could be used each time the tool was changed.
Sorry I can’t talk about this much longer as I still have the nightmares (mainly about corned beef sandwiches).
Anyway enough of that. So when we machine our first profile we can add some on to the tool radius in the offset file. When we check the part we can adjust the offset and re-cut the profile to achieve an accurate result.
The Rules:
Shape must be continuous and consistent.
You can’t cut along a line and then go back along it.
It’s important to allow more than the tool radius when entering tool compensation. The same applies when you come out of tool compensation.
Internal corner radii and steps must be greater than the tool radius.
Always allow more than the radius because when you adjust it it may be larger than the actual tool you are using.
Don’t ask
For example if you have a 12mm endmill but you have .2mm in the wear compensation. The machine thinks that the tool is 12.4mm in diameter.
You can’t do this in cutter comp:
You would have to apply one cut in G41 and cancel with G40 then do another cut in G42 and cancel with G40:
