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Anybody still use 2 flute end mills?

It seems like for square end mills, aluminum specific end mills are 3 flute, and steel are 4 flute variable. I haven't needed to load a 2 flute more than a handful of times in the past year. Anybody still use them regularly, and if so, for what?
I use 2-flute end mills (called slot drills here) a lot, for milling keyways in steel shafts. I have about 40 6mm keyways to cut tomorrow...This is on a manual BP, keyways done in one or maybe two cuts. No Y-axis adjustments needed, a two-flute cutter will cut the correct width. I 'mike' the cutters first and use one that is say 0.03-04mm undersize.

Actually, I like two-flute cutters a lot and use them for other milling too.
 
Anybody still use them regularly, and if so, for what?
Yes, everyday they lie next to my other 4's and 3's. So that nothing jingles around. So they are spacers.
Actually I wonder what I'm going to do with some of these never used 2's. Al and plastics?

I should have used a 2 flute with some Tivar 1000. Trimming plastic for a sharp edge is difficult.
 
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