angular contact bearings - back to back, further apart

[dsc]

Jazz I do have a fancy SKF locknut with a grub screw (pricey little bugger) which I could use, the only issue is accessing the grub screw as it's on the side. The cap / bolt is easier, as I can bolt it up from the top, but proper preload doesn't guarantee the bolt staying where it should without threadlock (I think).

As for expansion John, I'm guessing you meant thermal expansion, which would force the housings further apart and increase the preload? this shouldn't be an issue as all the parts will stay close to room temperature all the time.

Regards,
dsc.

[johnsattuk]

As for expansion John, I'm guessing you meant thermal expansion, which would force the housings further apart and increase the preload? this shouldn't be an issue as all the parts will stay close to room temperature all the time.

Regards,
dsc.

Would depend on the materials of the housing and spindle and what the source of the heat was. If the spindle is hotter it will decrease the preload.

Is not usually a problem with slower running spindles like lathe headstocks or gearboxes which are oil filled as the oil evens the temperatures out. More of a problem with HS spindles where a lot of the heat is generated by the bearings and the rotor and the housing is cooled from the outside.