Interesting, mine was that the Nomad 883 Pro is built like jelly… I’ve tried to push the machine to its absolute limits while measuring power consumption and it becomes a chattery mess long before it maxes its 75W spindle power. I went and measured the flex in various components and there’s a lot. You can follow my whole journey and see the numbers in this thread.
To be fair to the machine, the structural components look good, the flex seems to be in the linear motion system, particularly the anti-backlash nuts but also a bit in the linear guides. @Vince.Fab was able to do amazing things with a ballscrew upgrade.
Did you ever do it with the stock motor and upgraded cartridge? It looks like you’re cutting at 12kRPM so I guess not?
The .04" WOC, .04" DOC. 40ipm cut you mention was ~1.05 cubic centimetres per minute but if you take away the 20% MRR boost from your 12kRPM spindle, you get 0.83.
My highest stablish MRR with stock was 2.7mm WOC, 1.5mm DOC, 250mm/min, 10kRPM, single flute, which is 1.01 cubic centimetres per minute but I was always a hair away from becoming a chattery mess cutting like that.
I’ll be curious to see more cuts but even just the improved noise is a nice upgrade.