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A couple more points about grease.Too much is as bad as too little..............1/3 of the annular space in the bearing is the "normal" amount of grease to be applied.If the grease contains Molybdenum Disulphide and it is packed too tightly into the bearing then as the Moly overheats it forms an abrasive compound which does the bearing no favours.There are commonly 2 "black" greases, those containing MOS2 and those containing Graphite which is a truer high temperature grease.Hope this helps.Best RegardsBob
I agree. Grease isn't the problem. If it is then it's not the only one. The poor guys who paid either $3265.00 or $1965.00 for a lathe (albeit a very accurate lathe) without a quick change gearbox, no power cross feed, threading range from 10-32 tpi and a 4-way tool post deserve better from Grizzly than "here's the parts. Good luck" The responses I've gotten from them seem to say that they're OK with fixing the problem. I would have had that under-300 pound puppy in the trunk and driven to Muncy in a flash.BTW here's the lube spec for the headstockHeadstock Fluid Type........................................................... ISO 32 (eg. Grizzly T23963, Mobil DTE Light)
If you look up the bearings in question on the manufactures web site SKF. FAG or whyYou will find two speed ratings one for oil and one for greaseNow as you know I have replaced the AC bearings in my lathe this led me to do a lot of web research .Now the ones fitted were 7007 series's from memory ( May not be accurate) grease was approx 15000 rpm and oil was 30000 rpm It would seem its a function of how the bearing can push the lubbrication out of the way without overheating Now I would assume that the OEM fitting would not have been a high precision set let alone matched pairAnd the speed low good clean grease would have been fineI would go with a bad ,unclean assembly at the birth of the lathe Also how many are out there in the wild with grease in that are working satisfactorily with the owners quite unaware that it has grease in the bearingsBTW I run mine on oil even with its top end of only 3000 rpm as the lathe calls for nuto32 in all the zerks and that what the oil gun is filled with keep it simple one gun all the zerks no mistakesStuart
I believe that in the German auto industry, nothing is repaired in the US. Everything is removed as a unit and replaced, while the problem unit is shipped back to Germany for repair and appropriate execution of the offending original assembler.