The program I built for the thread tenon uses 800 rpm for the threading cycle and it removes .005 per pass till it hits my minor thread diameter for fit. I haven't let it do a chamber on its own yet not ready to let it do that by program just yet this is the first chambering on this machine so I will be using the digital read out with the carriage to drive the reamer to set the headspace. I will probably get to the full cnc for chambering here soon as it saves a lot more time as an operator but dont want to mess up a clients barrel as he wants to hunt with it here in a few months and wants to do some load work before they take off on their hunting trip.