Micro annular cutter - video

[Toolmaker51]

this is not something I have experience with, just yet, but I've read that cutting plastics and softer metals, like brass, you want a less acute angle on your cutter. "Dubbing" is what they call it when you do it to a drill, IIRC. Can you confirm or deny?

On the subject of tempering, early 1903 Springfield rifle actions were tempered by eye, and there was a potential problem with them shattering due to inconsistent tempering due to changes in the lighting in the armory from day to day and with varying weather. The very first Springfield I ever owned was one of those. Not that there were many that did shatter, but it's, shall we say disconcerting?, to have that happen when the thing is held near your face... Mine wound up as a wall-hanger on my dad's wall, and I eventually got another that wasn't in the early serial number range. The armory folks got pyrometers for their tempering ovens so they could avoid the problem. This is mentioned in Hatcher's Notebook, if anyone else is interested.

Bill

All of it, interested in all of it. I channeled up the Maj. Gen'l just days ago in a discussion (one side ranting) regarding flat earth phenomena. Orrery's, ballistics, space flight, navigation, plain old physics, astronomy, sunrise & set, the works.
Typically, the only evidence they produce are photo's; minus working knowledge regarding optics.
Good times.

I participated in Pacific Fleet Matches at Camp Pendleton. Garands, M1-A, AR patterns abound. A few 1903 A3, but not in 1000 yard matches vs other service rifles, too advantageous. There's never been a superior bolt action service rifle. It's thought of, in comparison to the Mauser (ideal hunting rifle), Enfield (ideal battle rifle) the ideal target rifle. Tough combination when majority of troops were trained as riflemen/ marksmen, not hunters or just infantry. Much of it hangs on the original sighting, evolved from the tangent style of the Krag.
A 1/2'' (minute) small aperture on a Garand isn't so bad either. My Garand remains as issued, MI-A wears NM, installed by none other than armorers from NSWC-Crane. They travel in a mobile armorers lab. Now, that would be a job!

Yeah.
All of it, interested in all of it.

Oh BTW, not aware of a term applied to removing a bit of drill helix, instead one or another description of the process, something parallel to "just stone the lips". That business with brass occurred lots. I'd usually get a pilot through, and step the final bit with the depth stop or knee. The real problem lies in lash of rack and pinion quills, far less when screw or gear train fed.