Skipping firs Hole of Drill pattern

[TheKitMill]

I am drilling a series of holes on my Mill No matter how I post or select the holes Acorn skips the first hole.

I am using MasterCam to post the code and I can run this exact same program on my Haas VF 4 with no problems all holes drill as they should

Acorn version 4.20.1

I tried just drilling one hole and same result Moved to position but does not execute the drill cycle, Tried peck drill, Bore drill and chip clearing cycle same result each time.

All other holes selected drill fine it just does not drill the first hole and it does not matter which hole is selected first.

Any ideas appreciated

[cnc_smith]

Your post needs to be modified so the X and Y are on the G83 line too not just on the lines before. This would be the same for any of the canned drilling and tapping cycles.

[TheKitMill]

Thanks, It this an acorn requirement because the program works on my other machines as written. I am using a Haas Post but I will see if I have a Centroid Post available. Appreciate the help.

[swissi]

TheKitMill,

I'm not a canned cycle expert but looking at the code and what CNC12 does with it, it looks to me that the output of the MasterCam post processor is not compatible with the canned cycles of CNC12.

Code: Select all

N106 G0 G90 G54 X-1.378 Y1.378 S900 M3
N108 G43 H5 Z.1
N110 G99 G83 Z-.75 R.1 Q.1 F6.
N112 X1.378

I assume that yo want the first hole at the position X-1.378 Y1.378 from line N108 but it looks like the canned cycle G83 drills the first hole at the first position it receives after the G83 command which is on line N112.

I guess you need to change the MasterCam Post Processor to output the first hole position after the G83 command and not before.

Just my guess...

-swissi

[cnc_smith]

Master Cam does have posts for the Centroid.

[cncsnw]

http://www.cncsnw.com/P2howto.htm
http://www.cncsnw.com/faqCAM.htm

[TheKitMill]

Thanks I will make the change and give it a try. Great fix