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guided deep drilling with peck

DanielG

Stainless
Joined
Oct 22, 2014
Location
Maine
I need to deep drill a hole. The guidance from Guhring is to drill 1.5D with a stub drill. Then enter the hole with the long drill at 200 rpm, 1/2 feed until I reach 1D. Then speed up to 180sfm and go to full feed rate. Peck at 5D, then 3D, then 1D.

My CAM system (HSMWorks) gives me canned options for either "Guided deep drilling" or "Deep drilling - full retract". The latter is G83. For the former, I put in a positioning speed of 5ipm and positioning speed of 200rpm. The G-code it's spitting out is:

N0195 S1913 M03
N0200 G54
N0205 M08
N0215 G00 X3.375 Y-0.5
N0220 G43 Z8.07 H08
N0230 G00 Z7.67
N0235 Z5.79
N0240 G01 Z5.2306 F5.
N0245 S1913
N0250 Z1.99 F9.6
N0255 S200
N0260 Z5.79 F40.
N0265 G00 Z7.67
N0270 Z8.07

What I think should happen is that it rapids to Z5.79, then goes to Z5.2306 at S200 F5. Then it goes to Z.199 at S1913 F9.6. Am I misunderstanding the g-code above? It looks like it's not going to S200 until lin 0255, at which point the hole is done and it is only slow on the retract.

Once I get understand the g-code, I plan to just add the pecks manually with G1 commands to make it retract to Z5.2306 after reaching the appropriate depths.

Thanks,
Daniel
 
I ended up editing this by hand to flip things around and the hole worked beautifully. Now I just need to figure out how to fix my post.
 








 
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