I've only ever used annular cutters in the mill with a rigid setup. I find they like slow rpm and a steady feed. Oh, and you need (I think they are called) Weldon shank arbor. Mine is R8 for the mill with the 2 set screws that contact the annular stub flats. But I'm pretty sure they come in all the standard tapers. Basically I use these instead of big drills in material<2". And small bonus you get a slug of material instead of a pile of chips.
Some people have made custom bars/cutters & used their boring head for trepanning.
I've always wanted to make my own Swiss Valcut clone but a) I just haven't had much need for making too many holes b) I suspect the magic is in the cutting tool geometry.
Rather than a precision square hole like they have broached or whatever, I was thinking of laminating a block of stock with permanent Loctite screws to yield a precision square opening for the bar & then either machine the block round or just leave it square-ish, as it will function the same.
Some people have made custom bars/cutters & used their boring head for trepanning.
I've always wanted to make my own Swiss Valcut clone but a) I just haven't had much need for making too many holes b) I suspect the magic is in the cutting tool geometry.
Rather than a precision square hole like they have broached or whatever, I was thinking of laminating a block of stock with permanent Loctite screws to yield a precision square opening for the bar & then either machine the block round or just leave it square-ish, as it will function the same.
