fpworks
I would agree with you for most form taps, but you must try the Fette line of form taps. I have taped 4-40 thru 5/16-18 in 6061 at 8000 rpm with no prob. I curently have a 5/16-18 Fette that has more than 300,000 holes to its name, 1.5" deep blind, 7.3mm tap drill. The treads look great and the tap looks like it just came out of the box. |