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Hi all, I understand almost nothing of what you guys talk about here. I joined because I am currently designing centrifuge control systems and figured people using them day to day might offer some insight and opinion. At the moment I am particularly interested in w2t (or w2td) control. Firstly does w2t mean much to anyone here? You know, 400 million w2ts means something to someone? My understanding is w2t is the integral over the run time of rotor speed (rads/s) squared. Because you can measure rotor speed more accurately than you can control it w2t control has the advantage of allowing automatic adjustment of the run time to compensate for rotor speed variation. This is a real advantage providing more repeatable results and is something I would like to include in the control system. w2t with units of (I think) rad^2/s and huge numbers (like say 4.4 billion w2t for 30 minutes at 15,000 rpm) doesn't seem to be very user friendly but if users understand it I should go with it. I am also considering 'rcft' with units of gs, g * seconds seems to easier to understand and won't have such huge numbers. Your thoughts and opinions would be welcome, as would pointers to anywhere else centrifuge users hang out.