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what RPM

If you take care and widen the parting a bit, should be no problem anywhere in your comfort zone. That said, speed, which does not make heat, will make a lot of energy available to bend a 2mm tool if you bind it. I'd stay low just in case.
 
With practise you will get to a point where you just part off at full speed, cradling/catching the blank in your off hand, grab the next blank, load it so its on center point of the drive shaft and gently apply tail stock pressure without stopping or slowing the lathe. Stopping the lathe takes too much time when in production mode (spindle work - mass production).
 
Whatever your comfort level dictates.

Faster is good but but then bad things happen just as fast as the good things.

I like my Oneway 1018 running at 4,000 for spindles less than 4" diameter
but I've been turning a long time.

concentrate on using sharp tools to make clean cuts. Speed will come later.

-Al
 
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Use the parting tool as a cutting tool and not as scraper and do relief cuts so that your tool has some room for the chips to get out. If you are new to turning set up some scrap pieces and make a few hundred practice cuts to see how the tool cuts verses scrape and then work on your speed but speed only comes with experience. Be careful when trying to part off with the lathe running and the piece only mounted between centers.
 
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