Hi All,
Can someone else try John's code and see what it looks like in MACHTurn?
SEE ATTACHED as i never came across this one.    So maybe i am not going bonkers! 
RICH

RC,
Maybe " WHAT TAUGHT THOUGHT HE SAW ONLY THOUGHT HE SAW"  
Hate to shed doubt!
RICH

Rich,
 I can vouch for you.....you're NUTS !
No really... I get exactly as you with RAD. and DIA. settings.
RC

HM....
You should try it with the SS Plug in!
I can deal with the "humps and bumps" but if the display is screwy your not sure what
your dealing with without  turning it. I don't even trust my backplotting on this one.

RICH

Something else....None of our displays show the zig-zag tool path that John is showing with his rough AND finish passes.

Maybe Graham can comment on the code as there are G18 G17 ?? then also about the G70.
I never used the G70 and my book say's it a Fanuc code??

RICH

RC,
The roughs are straight lines even though they look rather smooth.
When i backplotted the file i got small segments instead of a smooth curve for the finish cut.

Still would like a DXF from John.

What Mach Version are you using? I using 3.042.024 and the standard screen set.
RICH

R.020 and std lset
RC