Fanuc 21m programming question

[bob1371]

Hello,

I have come across something in a program that I have never seen. The program has 4 lines in it that will have either a x or y axis move followed by K0.

example
x240.5 k0
y100.2 k0

Any idea what the K0 is?
thanks,
Bob

 

[ncassist]

The Fanuc has a repeat function used in the G80 series commands.

Example would be:

G81 Z-20.0 R5.0 F100.0 K2
X100.0 K2

The K in these examples would drill twice at each location. Perhaps the programmer was anticipating a problem?

Dave

 

[nbucska]

If K2 = drill twice is K0= don't drill it at all ?

<nbucska@pcperipherals.com>

 

[bob1371]

thanks for the reply. Im assuming the K0 is dont drill at all. This is during a move with the B axis turned over and the drill moving around a clamp cylinder. I figure it was for safety but still not sure it was needed.
Im actually on the maintenace end of things but trying to learn the programming side also.

Thanks,
Bob

 

[mrainey]

Somebody once told me that a K0 would let you skip some holes in a hole pattern. Say you broke a tap in hole 3 of 8, but wanted to tap 4-8 before removing the broken tap. Put K0 in the xy lines of the holes you want to bypass.

 

[bob1371]

maybe this person did something like grid drilling and just put the K0 at the holes they didnt want to drill? I will take them out and single block thru it (slow speed of course) and let ya know.

thanks,
Bob

 

[cncprogrammer]

K0 = data set only

Typically K0 is used to data set a canned cycle so that the action is not carried out when the cycle line is read. This is normally used when a sub-program is holding the hole positions for instance.

i.e.
G81 X1. Y1. R.5 Z-1. F1. K0
M98P1000

If the K was left out the cycle would execute before calling sub.

In effect, as mentioned above, it is usable as a position skip.

Older FANUC's use L instead of K. Nornmally a K with a value is used in conjuction with INCREMENTAL values in a canned cycle and will produce a grid shift with each instance. ABSOLUTE will run twice at same location as previously mentioned.