I had to machine some 3/4 304 stainless round rod last week, and it
performed a little oddly. I first noticed it on the band saw when I cut the
slugs to machine. They would cut with a kind of eye shape on the end. Then
when I cross drilled it I noticed I got beaughtiful continuous curls about a
1/4 of the way in, then through the middle it gave me kinda nasty looking
munched up looking chips, and as it approached the other side nice pretty
curled continuous chips would start coming out of the hole again. I drilled
them on the KMB1, so feed was consistant.

It was like the surface 1/8-3/16 was what I was expecting, and then the
middle was something totally different.

When I milled the hex half way through to engage the pins I didn't notice
anything odd, but that was planned to be a pretty light fast cut.

I have no idea what it means. It was just seemed odd to observe. They are
just cross handles for a core pull pin so the alloy is really not all that
important. Just needed to be stainless.