Julien is on the right track. We have more RPM and overall power, but from a torque perspective you’ll still bog down the spindle if you take too deep a cut. Deeper cuts are less forgiving because you can only compensate so much with feedrate override if the settings are bad. Sometimes it just won’t work even if you back it down below 50%.
Plus with machining metals without coolent, chips and friction against the wall become a much bigger factor. Safer to keep a similar depth of cut, but up the linear feedrate to maximize material removal rate unless you are comfortable with doing your own trial and error.
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