Having major problems drilling a alloy called c-276 very hard to cut and super hard to drill. I need to drill a 2.125 dia. hole 6 inches deep! Machine is a Dawoo Puma 250 slant bed lathe, drilling with a Kennametal fixed insert drill. the drill pass i use is as follows:
g97 1302(SUB-=DRILL)
N2T1010(DRILLFIXDRILL 2.125)
N3G97S625M3
N4G0G54X.00M8
N5Z0.500
N6G1Z-3.0F0.001
N7G0Z8.0
N8X12.0M9
N9T1000
N10M01
N11M99

after drilling the first 3 inches I rapid back in and drill the last 3 inches, problems are inserts chip machine reaches torque limits machine stalls then into alarm, very misserable, I tried a peck cycle but not good, get same results, any help would be appreciated. thanks!