I used the middle belt position in back gear. 70 or so fps. I got chatter way back when first attempting faster speedsWhat speed do you run your HSS at? I run HSS and have not used a carbide yet but like you I have considered the same.
200 RPM with a reasonably sharp or freshly sharpened bit has worked well for me. I keep things wet with dark cutting oil and maintain pressure by hand or with the power feed.
10 minutes doesnt make sense. I am doing it in about a minute with a hss blade. What feed rate are you using?I used the middle belt position in back gear. 70 or so fps. I got chatter way back when first attempting faster speeds
I can say it is an easy 10 minute cut the way I'm proceeding now on 1.250" barrel.
This doesn't matter as much with a parting tool because the plunge tool doesn't typically make a bird's nest. At low speed the Iscar sort of folds the swarf into a U shape, to give it clearance in the cut, and coils it up like a snail. Even at low speed the biggest snail Ive seen was about 1.5" diameter and they just quietly fall off into the chip pan.The carbide parting tools are typically a chip breaker design, the additional speed makes it easier to break the chips.