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Old 8th July 2014, 07:29 PM   #1
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Default DIY Bearing Question

First post may as well stir the pot.

I have "spindle" stock that is roughly shaped as the photo.
If the spindle needs to have a "cup" machined to accept the bearing, would any advantage be gained from the spindle having it's own trust plate as shown in the drawing?
Accurate machining is at hand.

Many thanks.
Peace
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Old Yesterday, 07:39 AM   #2
Calvin is offline Calvin  Germany
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Location: close to Basel
Hi,

I´m no mechanic, but my guess is that it´d be positive if the upper and lower contact points of the ball would see the same bearing material partners.
I´d also think about a cone- or cup shaped dip in one or both thrust plates to introduce a bit of ´stick´ to the spindle, i.e some breaking, resistive moment.
Most motors run smoother with a bit loading.
It´d also centre the ball, which otherwise could wobble in horizontal direction as drawn in Your sketch.

See for example Girati Grande p.67.
Imho a great inverted bearing design.
At the top of a fixed spindle is a plastic inlet as thrust plate, with a conical dip.
A ceramic ball will find a fixed position in this dip.
The contact zone will be a circle. This not only reduces the pressure-per-area between ball and thrust plate but also introduces a small breaking moment.
The ball is fixed in a hollow axle that is fitted to a Sub-platter.
Due to the platters centre of gravity beeing below the bearing ball the system and the high revoluting masses there´s no need for another horizontal bearing.
Only a plastic sleeve is fitted around the bearing spindle´s base.
Its designed so that a small airgap remains between the hollow axle and the plastic sleeve.
This is to prevent too much wobble of the platter.
The bearing of the Bauer DPS is similar, but uses a O-ring between hollow axle and fixed spindle.
The O-Ring hinders oil (or rather grease) to spill out and introduced the required amount of breaking moment.
With these kind of bearings theres basically just one contact ring/point that takes over both the vertical and horizontal bearing fuunction.

jauu
Calvin




jauu
Calvin

Last edited by Calvin; Yesterday at 08:02 AM.
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