I have been machining longer than I care to admit (37 years) I would like to discuss insert drills for turning (CNC lathe application) I have drilled hundreds of holes with these drills through and blind in 316, 17-4, 304, 303 SS Inconell etc.... I have used Sandvik, Kennametal, Iscar, Walter Titex as well as other brands. Never once have I entered the material at a slower feed rate then increased the feed rate once the drill is engaged. I am specifically referring to insert drills with two inserts a peripheral insert and a center pocket insert which enables the user to offset the drill in the X axis to drill a larger hole. I am also aware that on these drills the outer pocket inserts lead the inner pocket insert by .025 - .030 regarding speeds and feeds I always consult the manufacturer for a SFM and FPT range and given my specific work envelope (holding, mtl hardness, machine torque and HP etc... ) I arrive at a solid RPM and FR so. as I stated previously I NEVER have entered material a slower FR then increased the FR once engaged I have heard from many machinist that this is good practice, I disagree, carbide does not react well to changes in temperature or different cutting pressures. Therefore when using these drills which by the way are solely for removing material fast (not making a pretty hole) you use ONE FR and drill! I s there any one who can convince me I am wrong, I am open to change. Thanks.