Nearly crashed my denford triac machine and not sure what went wrong, help please?

[suesi34e]

Hi Jazz,
I am well out of my depth here perhaps you can get my head above water!
I have found out some info, as per the manual on the machine max federate is X,Y 2500mm/min with the Z being 1000mm /min.Is states feedrate override potentiometer 0 to 150% but I do not know what that means.
The guy that converted my machine has done many Triac’s and set the X & Y at 3000mm / min, Z axis at 2000mm/min I am asking him for the spec of the motors.
To cut out the rectangular shaped part in the vice with radiusedc orners I used a federate of 1900mm/min, s4000, cut depth 3.8mm per pass.
When it all went wrong the cutter was not cutting anything as it was working down progressively to the bottom of the hole that had already been cut inorder to just cut the last 1mm of the bottom left behind and break through it went wrong on the 2^nd to last pass so it did not reach the remaining 1mm to be cut.
I have attached photos of the motor tuning, video of the part being cut above job so motor can be heard, the spindle is a 1.1kw, DC, 1.5hp
The X,Y and Z ballscrews 16mm (5/8”) diameter x5mm (13/64”) pitch
Many thanks
Suesi