Setting bearing preload.

[Michael GilliganParticipant @michaelgilligan61133]

A slight digression [given that the question raised by Chris seems happily resolved]

It is perfectly possible to build a useful spindle using one Taper Roller Bearing, and 'whatever' at the other end. … The TRB then acts in way similar to the bronze bearing at the front of the Myford S7 [or the Mega Adept] Headstock, but without the need to pre-set a critical 'oil-film' clearance.

… This may have some merit for heavy duty drilling spindles.

MichaelG.

[Capstan SpeakingParticipant @capstanspeaking95294]

I used to be a Toolmaker at British Timken (RIP).

Counting turns will vary with the thread pitch. The proper procedure is to measure the static torque via a spring balance on an arm.

The shortcut is to nip it until there is the faintest drag when turning by hand. Lock it there or if you have a castle nut then back off to the first split pin slot.

More sophisticated set-ups may have spring shims.

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