Headstock bearing preload

[70 malibu]

Hello everyone !!

A while back I picked up a Taiwan 10-24 lathe that had gone through a flood.
No one ever did anything to this lathe since it was flooded several years ago,, it has been sitting.

I pulled the seal retainers off and there was still some water in the bearings.
I have dis-assembled it and the bearings were pitted pretty bad so I bought all new bearings,races, belt and seals.

I am now in the process of re-assembly and would like to know what type of oil to run in the housings.

Also,, how much preload to put on the tapered bearings with all 4 new seals .
I'm thinking around 10-15 inch pounds checked by chucking up a bolt in the chuck and measured with a torque wrench,,, am I thinking along the right lines here ?

Thank you to any and all info I can obtain on this matter !!

Have a great day !

Tom

[Falcon67]

This may not help, but the tapered roller bearings used in something like a 9" Ford rear - specifically the pinion bearings - are speced to run at 20~25 in/lbs new, 10-15ish used. I run 85w-90 synthetic gear oil in my race rear ends and have had zero issues with wear, breakage or bearing failures so that might be an appropriate weight for that application. Or look at the Griz manuals (all are on line) for lathes of similar size and construction.

[Rustynutz]

get hold of the data sheet from the bearing manufacture but you must remember that pre load on spindle bearings are set hot so any growth in the shaft puts the correct loading on it, there will be a high low setting for the bearing so set accordingly so its in the ball park both hot and cold if pos , The oil types are also there and related to the speeds you require.
hope that helps