Hi guys, I've been a member for a wile and never really posted anything so here goes. I'm trying to determine the torque requirements to turn an Auger. Radius of the core is 15mm and the outside diameter is 28mm. I've read a lot of literature and thesis regarding this subject and most of what I have read goes over my head as the research I've read looks into individual forces on the flight surfaces etc. I've been asked by my supervisor to negate any forces from the powder that is being conveyed by the auger and to simplify the problem by using only the solid core diameter of the shaft. If I use I=mr^2 for the moment of inertia and T = (I/(theta)(((omega2)^2-(omega1)^2)/2). I have specified that although it isn't possible but If I had 100% efficiency from the auger negating windage etc created by the rotating shaft that I need to rotate at 2500RPM or 262 rad/s for the mass flow rate of material needed of specific density. If I substitute value of mass of 0.423Kg, and radius of 7.5mm, I end up with a torque requirement of 1.08 Ncm. Does this sound viable? How can I add the contribution of 2 roller bearings to the equation at each end of the shaft? Any help would be greatly appreciated! Thanks Kris.