Welcome to the forum!
No, you haven’t damaged your spindle; the stock is shot and you should check the end mill for damage (it’s probably OK). This is what learning is all about! We’ve all been there!
The super plunge will take some research. There could be an issue with your CAD or how you set up MeshCAM for the part. Thankfully, this isn’t hard to figure out… it will just take some time.
No need to apologize! We’re here to help!
Winging feeds and speeds leads to (potential) disasters! Take your time, think, be careful and things will be fine.
The feeds and speeds from one type of machine are not transferable to another! Spindle characteristics, fixturing, and many different factors affect feeds and speeds.
Also, you stated important facts about your machining but left out the RPM of the spindle. When stating a feeds and speeds, one must identify the machine, the spindle (which may be implied by the machine), the feed characteristics and the RPM. If the RPM cannot be stated specifically, tell use the setting of the spindle/router (“11”, “warp factor 6”, “ludicrous speed”).
Without the RPM it’s hard to be perfectly clear about what happened here. That said, the SO3 tends to run at RPMs that are higher than the Nomad is capable of. With that in mind, a feed and speed winged from the SO3 would tend to “push too hard” on a Nomad… and what you are reporting would be expected to occur.
Can you please take a screen shot of the MeshCAM parameters? Also a screen shot of the tool definition (so we can see the RPM)? Also a screens shot of the MeshCAM tool path.
You stated you’re machining Aluminum. Can you please tell us which formulation specifically? There are many and they all have different characteristics. More detail is helpful, 6061 is good, but something like 6061-T6511 would be best.