Tried a new 12mm carbide bit today.

Lovely finish but degraded after approx 5m of cutting distance.

I tried upping speed from 8k and feed from 800mm/min

Here's some pics of the bit afterwards, some heavy wear.

Maybe I should have lub'ed...Click image for larger version.  Name: WIN_20181115_13_28_44_Pro.jpg  Views: 125  Size: 66.4 KB  ID: 25106Click image for larger version.  Name: WIN_20181115_13_27_21_Pro.jpg  Views: 127  Size: 48.3 KB  ID: 25107Click image for larger version.  Name: WIN_20181115_13_28_22_Pro.jpg  Views: 118  Size: 52.4 KB  ID: 25108

Am I still going too slow in rpm/feed or should I flood with coolant?

(the reason I did this dry was that I haven't got my cooland set up yet...)