b'Allied Machine & EngineeringDuring tool life testing at a customers facility, this 2.5"-dia.drill produced six holes per T-A insert for a total length of 90"and two to three holes/edge with a PWHR insert or four to sixholes/edge with a PW insert when drilling Timetal 17 (Ti5Al2Sn4Mo2Zr4Cr) with a hardness of 34 HRC at a cuttingspeed of 82 sfm and a feed rate of 0.0035 ipr. The high-strength,deep-hardenable forging alloy is primarily used for jet engines. According to Allied Machine, chip formation was much better when drilling at 131 sfm and 0.0055 ipr, but tool life can drop if the machining parameters are excessive.Titanium.indd 41 6/17/19 10:30 AM'