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Old 25th October 2012, 08:14 AM   #421
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The bearings for motion in the vertical plane that I used in my 1980s Tangential Arm and later in my 2010 Tangential Arm are of the zero friction/ zero stiction type. I don't know that Frank is using those bearings, but the description fits.
I am also using them in my 2012 Tangential Arm. This is a servo arm with absolutely no tracking error.
I'll describe it soon in its own thread.

Sincerely,

Ralf
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Old 25th November 2012, 06:24 PM   #422
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Here's an interesting arm that uses a straight headshell with no offset angle. The idea is to lessen side force so, alas, it has nothing to do with tangency. The bearing design is interesting with floating liquid. Check out the website.

ViV Lab Rigid Float Tonearm

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Old 25th November 2012, 06:58 PM   #423
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Quote:
Originally Posted by Straight Tracker View Post
This is a servo arm
Definitely the best solution cause it solves near all issues at once. No distortion due to angle error, no distortion due to angle errors of the cantilever and non symmetrical forces on it, no added frictional or inertial forces.
Remain only one: Torsion constraints on the signal wires. Can be solved with 4 neddles immersed in 4 buckets filled with liquid metal. That i did in 1967 with mercury (allowed at this time).
Strait arm on a ramp addresses a great part of this problem as the arm don't change his angle if the record is flat and well centered. So the wires can be in neutral position.
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Old 26th November 2012, 05:11 AM   #424
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A Van Eps tonearm was sold for over $2500 last year on eBay. Check out the pictures.


Highly Desirable 1960's Van Eps 2A Dual Compensating Playback Tonearm, Complete!



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Old 26th November 2012, 08:41 AM   #425
RCruz is offline RCruz  Switzerland
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Love that B&O SP12 cart
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Old 26th November 2012, 02:24 PM   #426
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A Van Eps tonearm was sold for over $2500 last year on eBay.
Beautiful piece of art.
I can't figure out where is the vertical pivot.
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Old 26th November 2012, 06:55 PM   #427
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I can't figure out where is the vertical pivot.
I believe it is parts #36 and #37

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Old 10th December 2012, 07:57 AM   #428
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Default Schröder LT tonearm

More revealing pictures of the LT arm. Notice the guiding mechanism below the pivoting plate in line with the armwand.... and of course the straight headshell with no offset angle.


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Old 10th December 2012, 09:33 AM   #429
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Wonderfull

What I would like to see is a movie capturing arm motion from top
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Old 10th December 2012, 11:16 AM   #430
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Wonderfull

What I would like to see is a movie capturing arm motion from top
Me Too!
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