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Deep slotting in tough steel
I find this work challenging. If the settings and cutter are not right the cutter will soon break down and self destruct!
The pics below show a 100mm bore cut in 56mm thick 4150 H/T steel. I cut through 28mm from each side. I have found that a small negative top rake needs to be lapped on the cutting edges for it to last the distance. Without this 'Eating' its own swarf and the chatter (difficult to entirely avoid especially on a light NC mill) will cause a sharp edge to break down quickly in tough steel.