The thread mills are said to virtually eliminate the possibility and consequences of tap breakage. Thread mills are available in both one-flute and three-flute versions, with the latter being suited for high-volume output needs. The thread mills remove manual operations by eliminating the need for hand tapping during full bottom-threading applications. Bottom threading can be performed to within 1 pitch. Externally supplied coolant eliminates the need for thread cutting oil, so parts and coolant reservoirs are not contaminated.
According to the company, the thread mills include an easily controlled pitch diameter and offer precise thread-depth controls to 2 × D, so that one tool can be used for both through and blind holes. Overall length of the thread mill is 1 5/8" with a shank diameter of 1/8".
Editor PickCoroMill 390 Silent Tools Bring Security to Titanium Pocket Machining
The CoroMill 390 Silent Tools can be ordered in diameters from 20 to 32 mm. It is available for both the new insert size 07, as well as insert size 11, with options for either cylindrical shank or Coromant Capto coupling.