clearance between shaft and shaft hub clearance between shaft and shaft hub eduvillela (Mechanical) (OP) 6 May 16 13:49 hello all! Can a high clearance between the shaft and the shaft hub lead to high vibration levels? And does it appear in the espectrum as 1x only ? thank you in advance! RE: clearance between shaft and shaft hub Strong (Mechanical) 6 May 16 17:30 Yes and harmonics of 1xSS are likely, especially 4xSS. Walt RE: clearance between shaft and shaft hub Tmoose (Mechanical) 7 May 16 01:48 The clearance by itself may not be an issue if the device is light-duty stocking-stuffer grade, and the set screws are well tightened. But The change in centering of a formerly well "balanced" part CAN and WILL result in some greater amount of unbalance. Note that eccentricity or change in centering of a mere 0.0015" uses up the entire G6.3 tolerance at 1800 rpm. page 4 here - http://www.irdbalancing.com/downloads/techpaper1ba... Shaft runout, resulting from shaft > ball/roller bearing fits or actual shaft runout also eagerly conspire to move even a snug fitting rotor off the rotating axis of the balance arbor, often making the "Precision electronic balanced" sticker pretty misleading.