Power Tapping Question , How To ?

That 4 flute tap is a bottoming tap and will take more cutting pressure making it slip in the chuck easier. I find it easier to machine tap through holes with a gun type tap that pushes the chips out the open end of the hole. Use of an appropriate tapping fluid is also helpful. I use WD40 for aluminum and Rapid Tap for most everything else. Good quality coated taps seem to help as well.
 
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