On Wednesday, July 8, 2015 at 2:35:05 PM UTC-4, wrote:
I just finished a job where I drilled 700 holes .468 diameter 1.600
long in 4340. I used one drill that had already been used at least a
little. The drill was a .468 split point stub length cobalt HSS drill.
So this tool drilled through 93 feet of material removing 61 cubic
inches of 4340 in the process. I'm pretty impressed. I ran the drill
at 650 RPM at .006 IPR feed. Actually the drill fed while the part
spun. The drill is still in good enough shape to run at least another
100 parts.
Eric

And the drill was made by ...........................? And bought from......................?

I recently bought an annular cutter off ebay. Due to circumstances beyond my control, I have not used it for real work. But I think it will be the bees knees for drilling largish holes.

Dan