Thanks gentlemen got the loading and nut specs right from the manufacturer, so following specs and using torque wrench to do settings. Have had 2 different problems- first time castellated nut let go on drive side bandwheel I believe flat washer between out board bearing and castellated nut deformed first and by time I got mill stopped the nut had sheared the cotterpin and had a couple of threads left holding on, that was less than fifty hours on new mill. Next three occurrences the shaft deteriorated under the inboard bearing on the driven bandwheel. All 3 about 20 hours run time. To me the shafts have not been hardened sufficiently after machining and or the bearings are too small for the loading. I have been cutting standing dead Ash ( 16% MC ) and some are in the 36” range sawing live edge slabs. Have tried to load pictures but won’t allow me or I am doing something wrong.Have tried using a higher torque than specified but could feel temperature of housing was higher within minutes just spinning blade and not sawing so went back to specs. When installing bearings made sure they were seated properly. Last shaft went to town and ordered good SKF bearings instead of using the Chinese crap Vallee supplies. After disassembling checked inner races of bearings and they were still original measurements measured with calipers, showed no signs of blueing ( high heat) , using top quality synthetic grease. I have worked as millwright in large commercial mills years ago so this stuff is not new too me, know my way around circle mills, bandmills, resaws, chippers ,etc. It is very apparent that there is no pride of workmanship and companies are making stuff as cheap as possible. Very unfortunate for us the consumer.