1st chips, no blood

At 4" you are good to go, any problems will happen inside the spindle, you may easily run such a small diameter at the maximum speed that the machine permits, I suspect that this is less then 5000 thousand Rpms.

Have at it.
Do not however hang 4' out of the back of a lathe without dedicated support, this will likely end in tears.
 
Do not however hang 4' out of the back of a lathe without dedicated support, this will likely end in tears.

And a trip to the emergency room. Didn't happen to me, but I had to change my shorts, clean up the mess and move the lathe back where it belonged.
 
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