Cutting speeds depend on the tip. In that plastic I'm running 20-40ipm but are really light cuts..
It's only a 1/8" tool shaft.
Really depends on the motor and probably how long your bearings life span will be. But seems like a very quality unit. For sure would last longer then a typical dremal. Also would run way cooler tool temps (due to better bearings and contributing less to heat from them vs a dremal bearing and motor shaft adding heat to the bit)
Cutting speeds are a factor of load, material hardness ect.. So hard to say what the cutting speed is with a given spindle.
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