Inliners International Forums General Discussion Engines Tapping Cast Iron

I have used the same Tap(4 flute)when tapping heads for the last FOUR years with either tap magic or tap-o tap oil from goodson Gold Formula And I never have had any break or get stuck.Yes i have done it dry on cast iron but the taps do no seem to last as long.
But i do have to agree with CnC dude It will mess up a pump on a fluid system an cause other metals to rust.But I tap buy hand so
no problems there for me.When milling the Boss's out I do with
what is known as a dry cutter end mill/s Another words are ment or can be used For Dry cutting.

But just my 2cents and the way of doing things.