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If adjusting a mini lathe spindle bearings it on subject.?

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FYI Some locations the taper roller bearings do not need per load.

They need a little room to grow as it heats up.? Typically it is 0.000,5 to 0.002"?

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Dave?

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On Thu, Aug 8, 2024 at 01:53 AM, Jon Rus wrote:

One of the great virtues of tapered roller bearings is stiffness. This is important in a lathe as you need to have the headstock remain in place under load. The greater the preload the stiffer the system but also the greater the friction and the lower the load capacity. The instructions for my Atlas 12" tell you to tighten to a moderate load and run for 30 minutes unloaded. The bearing housing?should get warm but not hot!should

Unless the lathe has had a bearing upgrade, it comes with deep groove ball bearings, not tapered roller bearings. In either case, bearing preload does have to be set. Here's the SKF document, a Google search will turn up others that (to me) are less lucid.

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Replacing the original bearings with tapered roller bearings simultaneously replaces sealed bearings with open (unsealed or shielded) bearings, requiring some type of external shield to be added to keep foreign matter out of the bearings. Replacing the original bearings with angular contact ball bearings lets you stay with sealed bearings that are a little less rigid than tapered roller bearings, but, still an upgrade from original. I did mine years ago & have been happy with the improvement.

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Roy