ooops just saw the pause statement in your program, dump it(especially with a drill chuck) you can also get the same result if you just feed slower for the last .005 and wont notice a rise in part time. for some reseon a drill chuck when it doesnt have pressure on it will chatter like heck.
if its one of those parts that has to have a pause I usually feed it slower like by half or less for .005. dont know why but its something I have done and it gives a nice finish.
N1000
G0 Z.1 S7000
G1 Z-.3 F15.
G0 Z.1 S3000
G0 Z-.28
G1 Z-.395 F7.5
G1 Z-.4 F2.0
G0 Z.1
M99 |