No responsibility from Kennametal is assumed. Our customers do not have a problem with it BUT I talked to 2 people today that indicate aerospace and form tapping do not mix. These calculations are based upon theoretical values and are only intended for planning purposes. The Groove serves two function: Permitting lubricant to reach. We have also had to use some Moly-Dee / Threading oil concoction on a recent job where were were using a sprial point tap in low carbon plate (Heat Exchanger material - similar to A36 in the way if behaves to cutting tools) to keep the threads from tearing, coolant just wouldn't cut it, pun intended. Engineering Calculators / Holemaking Calculators / Tapping Torque and Horsepower Calculate Machining Power and Torque for Cutting Tap Applications. OSGs EXOTAP NRT Forming Tap is a Roll Form Tap extrudes the thread form by displacing material. For your tool steels I'd go with the Moly Dee, CR and aluminum, a medium to high coolant concentration should be fine. We did just finish a job in 12L14 on the lathe using a 9/16"-18 form tap, don't recall the brand off hand, but after about 500 parts, it lost the first couple of threads on the front of the tap.kind of sucks when the bar feeder is full up and it keeps kicking out parts, that are bad! Someone here years ago said to never set the automatic cycle count higher than what you are willing to throw in the scrap bin.wise words, I wish I could recall who to give credit to though. Using Blaser's 'Blaso-Tap' which is really thick like honey. 80rpm is all but it's one pass (no peck tapping). The 1/4-20 cut tap has currently cut 240 holes and still looks great. We pretty much run coolant with aluminum and CR or 12L14, but if form tapping T304 or T316, we use Moly-Dee. I am currently tapping titanium and am having huge success I am using Emuge's D-Ti taps.
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