A Copernican View of the Turntable System

Of course Dertonarm is right that there are…. “almost constant movement in microscopic dimensions” of which we are not consciously aware.
How does that affect the ‘ouboard tonearm pod’ in the Copernican turntable system?

Firstly let’s look at the manufacturing tolerances achievable in the ‘real world’:
Some of the tightest tolerances available are +/-75 microns (a micron being 1/1000 of 1mm).
On the “microscopic” level, a molecule is measured in Angstroms (1/10,000,000mm), whilst an atom is approx. 1/1,000,000,000mm.

Now imagine the platter of your turntable, machined to the tightest tolerances of flatness and roundness with the tightest tolerances of spindle centring available?
In terms of molecular and atomic accuracy, the platter will deviate from perfect flatness and roundness by millions and hundreds of millions of molecules and atoms, whilst the centre of the spindle will be millions of atoms off-centre.
The record of course, not having its centre hole or overall diameter even remotely close to +/-75 microns in accuracy, will be wobbling its way around the spindle with gaps between it’s centre edge and the spindle itself, measuring hundreds of millions of molecules wide.

This manufacturing INaccuracy is repeated throughout the tonearm and its bearings which are slopping and rattling with gaps millions of molecules wide whilst the deflections and movements in the tonearm on the molecular level, resemble slow-motion images of earth-quake affected suspension bridges.

So worry if you must, about the microscopic movements being inflicted upon your turntable system…….but fear not for your proudly sitting ‘outboard tonearm’. It stands solid and immovable (the more mass the better) and the accuracy of your tonearm set-up will remain unchanged month after month as evidenced by we, who actually have them, can testify.

Halcro, your decription of Corby's armpod stability being questionable due to the amount of cantilevers involded surely contradicts your above response unless I am missing something.

http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1294870073&openfrom&468&4#468

Brad

Dear Nikola, I died many times for the absolute truth and will most probably continue to do so.
My problem with gravity is that I never managed to overcome it in the sense of Douglas Adam's "Hitchhiker's Guide"-Circle...... ;^) .....
The "cruel mistress" on the other hand never becomes boring nor loosing it's grip on my senses and interest ( remember Winston C.'s famous quote ? - "I've never been bored...").
Kant was a human being ....... so in his sense of conjunction of human kind...;-) ...
Cheers,
D.

Brad,
Corby's response to my concerns shows that he has an understanding of structural rigidity and its limitations.
His centre cantilevered vertical 'pole' being solid rather than a walled tube, and extending well down into the bottom solid pod imbues the structure with vastly stronger rigidity than I otherwise imagined?
Of course, the cantilevered arm-fixing plate is still a weakness which Corby realises.
Bear in mind that many turntables employ the same cantilevered metal armboards incl. Raven and Micro Seiki.
They can be rigid enough........as long as we don't get into sub-atomic movement? :^)

Dear Daniel, I thought so but there is a proverb in Holland : 'the cat has seven lifes' which may imply exclusion of the number 8. Some concessions reg. the 'real life' look to me as reasonable. Ie I still think that Kant was to severe as well as to optimistic.

Regards,