The solution to your problem is in this thread. I had the issue as well.
http://www.cnczone.com/forums/showthread.php?t=56894 (Syil X3 Drilling Problem)
I am trying to do some peck drilling for my current project. I set it up to peck 4 times but when I run the job, it just drills straight down without pecking. The simulator in Dolphin CAM shows it pecking - is there a setting in Mach3 perhaps that is preventing the pecking?
Cool, thank you. I will try this out tonight. Is there any difference between the two post processors that John uploaded in that thread?
Yeah, there is. Don't use the Mach3_inc.zip (or whatever it's called). Use the very last one he posted. My Syil SX3 didn't like the inc post at all. It's probably just a result of the fact that I use ramping down while cutting holes in material.
Great. Thanks again!
I should have posted this earlier but that post processor fixed me right up! Thanks for pointing me to that thread.
No problem, glad it worked for you.