All
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
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
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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ViV Lab Rigid Float Tonearm
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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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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!
Highly Desirable 1960's Van Eps 2A Dual Compensating Playback Tonearm, Complete!
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.
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.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Wonderfull
What I would like to see is a movie capturing arm motion from top
Me Too!
Thales Simplicity
Tonearm porn! Hi-rez images below came from this website.
Tonearm porn! Hi-rez images below came from this website.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Exceptional thread showing many high end tonearms (completely over my budget new or secondhand!) with loads of advice and ideas. Planning to mod my Keith Monks uni-pivot re-designing a straight head shell, mounting the pedestal on a computer servo driven linear platform. Still waiting for parts to arrive from China (Re-wire to eliminate mercury baths will provide space for sensors) Will post pictures of build and comment on hopefully reduced distortion with better imaging ;-)