Using Rads and Chamfers Fanuc Control

Using Rads and Chamfers Fanuc Control

Category : Fanuc Mill

Rads and Chamfers Fanuc, yes you heard it there is a quick way of doing it just like on Heidenhain.

On a Fanuc control they offer two ways of adding rads and chamfers, one is pants and the other one is great.

It really is a pain in the arse to get some of these features working but it’s definitely worth the effort to sort it out. Read this article and get to work. Your life will never be the same.

The first way uses R and R- or K and K- depending on which way your going. Now I won’t be explaining how this works because really I haven’t got a fuckin clue

It’s way too complicated. If I did know I wouldn’t waste wearing out my keyboard or damaging my manicured nails to write an article.



Anyway it will only do orthogonal lines (if you don’t know what orthogonal means don’t worry it just means your a bit thick).

Rads and Chamfers Fanuc

This by no means implies that I think all goats are stupid (technically known as goatism).

Orthogonal means relating to 90 degree lines

Now lets do it my way and you get to do shit like this.

Rads and Chamfers Fanuc

Parameters…. Shit!!!!!

First of all you got to alter some parameters.

8134 3453 allows you to use ,R and ,C (Rads and Chamfers)

Well maybe you just need to check them (they might already be ok).

Rads and Chamfers Fanuc

Anyway just read this article it tells you how to do it.

Right having done that here is a simple turned part.

Rads and Chamfers Fanuc

Here is the code if you want to program it……Rads and Chamfers Fanuc

Now if you want to add corner rads and chamfers it looks like this.


Rads and Chamfers Fanuc

Oh and if you got the time and the patience to write the code here is what it should look like……

The Code

(Maybe some of my smart arse readers would like to check it, don’t tell me if it’s wrong because I don’t handle failure well.)


Rads and Chamfers Fanuc

So with a few commas an shit it’s real easy, you should try it some time.

Rads and Chamfers Fanuc

And that’s it job done. Just remember to check those parameters,

By the way if you wreck your machine altering parameters please don’t contact me I’ll just deny all knowledge.

If you want to learn about rads and chamfers on a Sinumeric Siemens 840D read this

Thanks for watching and reading

If you have been affected by any of the issues in this post or need CNC Counselling then contact me.

Or call us

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Albert Plens I Gorgues

June 1, 2021 at 12:52 pm

really fucking nice but can you do an equal chamfer around a cross hole in a cylindrical bar?


    June 1, 2021 at 5:32 pm

    Not with this type of chamfer I’m afraid

Albert Plens I Gorgues

June 1, 2021 at 1:29 pm

Really nice but can you make with a turn and Gcode an equal chamfer for a cross hole in a cylindrical bar?

Shaun Jacobs

August 19, 2022 at 2:20 pm

Looks great, I always wanted to know how to do this.
But how do you machine a radius at the beginning and end of a chamfer to make the chamfer corners round and smooth.
For example a 1.00 x 45 deg chamfer with R0.25 at the beginning and end of the chamfer.


    August 20, 2022 at 8:44 am

    You would have to program that longhand
    Control is not that advaced I’m afraid

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