RB99 here, lost the login I used originally. I didn't bother checking for responses after the 1st month, and about 2 years later the thread with some responses turned up in a google search for me. Thanks for your comments. The centrifuge control has been done for a while now with w2t. Ended up calling it RCFt with units of km/s. Effectively the velocity the sample would have at the end of the run had it experienced the same g force in a straight line (ignoring the laws of physics because the speed of light is easily exceeded). You still need to set rotor speed. You can stop the run after a set time or optionally after the sample has reached this notional velocity. It is a little more accurate and repeatable because it is based on accurately measured rotor speed. RCFt is displayed either way, if you set a time the time counts down to zero and RCFt up from zero, if you set an RCFt time counts up and RCFt down.
