G81 Spindle Reversal Between Each Hole

Should we change the tittle to G83 ?

If you are using peck drilling and still get strings then maybe your peck distance is not short enough?

@langdons and unknown
I'm getting tired of this. I just deleted several of your posts that had absolutely nothing to do with the topic.

@Aciera
Pecking too small takes too long but I'mma give it a try, my setting was about 1.5 diameter first peck then reduce 2-3 mm till reach 0.25 diameter

Darium wrote:

Remapping is way way over my head and messing around with it can crash my machine
 

The simplest case of remapping is fairly straightforward. It starts off looking a lot like a subroutine in its own file (which is also a possibility) 

See section 2.6 here:  linuxcnc.org/docs/stable/html/remap/rema...xample_remapped_code

Your ngc file would probably just contain the usual G83 but wrapped with a spindle reversal, and passing-through the XYZRQ etc parameters. 
 

When we had a similar problem with stringy chips, drilling holes with carbide drill with trough coolant in CrMo4, a modified G83 cycle solved that. Only retracting by 0.2mm after 2mm. Continue this 2.2mm / retract 0.2mm  steps until 
final depth, we made all the 120 holes without interruption and big loss of time. I think feed was about 0.12/rev