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Old 14th June 2012, 12:07 AM   #111
kevinkr is offline kevinkr  United States
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Hi Ralf,
Looking forward to reading about and seeing all of the updates to your arm project!
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 14th June 2012, 12:20 AM   #112
lowpoke is offline lowpoke  Australia
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Originally Posted by kevinkr View Post
Hi Ralf,
Looking forward to reading about and seeing all of the updates to your arm project!
Me too!!!!!
Show us what ya got at Homebuilt Hi-fi
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Old 14th June 2012, 12:33 AM   #113
von Ah is offline von Ah  United States
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Giggity giggity!
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Old 14th June 2012, 01:52 AM   #114
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Originally Posted by Straight Tracker View Post
I'll write a description of the drastic changes I've made to my Tone Arm and post a few new pictures too.
Can't wait!!
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Old 14th June 2012, 03:53 AM   #115
Illusus is offline Illusus  Canada
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RE: carbon fiber tubing ringing. Easton makes an aluminium tube with a carbon fibre jacket for use in archery arrows. Carbon fiber and epoxy resin bonded to 7075 core. Very stiff and straight, tolerances (reported by Easton) are .002" over 28" span. I have a few feet of this tubing to play with. It is 5/16" od with very thin walls and when tapped it sounds like it has a very high resonant frequency with very short decay, much better than the thicker walled larger diameter carbon only tubing I compared it to. Nothing measured, just by ear... FWIW.
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Old 2nd April 2013, 12:23 AM   #116
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Is the tonearm finished?
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Old 2nd April 2013, 08:07 AM   #117
Cobra2 is offline Cobra2  Norway
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Why carbon-fibre at all? ULM-arms was the hot thing in early 80's, but mass is not an issue?

Arne K
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Old 3rd April 2013, 07:42 AM   #118
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Default Hello everyone,

I find it hard to believe that I havenít posted since June 2012.
You may remember that the object of my tone arm was to utilize vinyl / stylus friction to pull the tone arm carriage along its tracks.
Sometime after June 2012 I got the tone arm to the point where it would play an LP. It has been pointed out by some readers of this thread, Frank Schroeder not being the least of them, that friction would not be constant across the LP and sure enough, the tone arm would not track at true tangency. There was a fraction of a degree of ďlead or lagĒ depending upon modulation. The tracking error wasnít much less than that of a pivoted tone arm.

Since my aim was perfect tangential tracking, I went back to the drawing board (CAD) and redesigned the tone arm until I found another solution. I kept the design of the carriage and the other mechanical features located in the base of the tone arm because it functioned quite well. I changed the design of the gimbals from a ďCĒ shaped design to a closed cylindrical design which is much sturdier and easier to hold onto during machining. But now I have a dilemma: I made a design change to the tone arm that I have to keep to myself for the time being. Patent law is such, that if I make it public in this thread, I lose all rights to the invention. Hopefully I can resolve that problem later this year. The invention applies not only to my tone arm but to tone arms in general. I donít want the big boys to take it away from me. I built two prototype tone arms since June 2012, one of which is mounted on my Micro Seiki turn table. As of now I have not found anyone to design the servo for me and I listen to music by manually nudging the tone arm carriage along its tracks with my thumb. Even though it is a fairly clumsy method, I am delighted to report that it doesnít affect the quality of reproduction.

I have always treated my albums with great care and I can now enjoy the almost flawless playback through my modest system. I can only sit down and listen for about 30 seconds before I have to get up and correct the carriage position but Iíll solve the servo problem sometime this year. In the meantime itís good exercise.

Here are some pictures:

1) My Bridgeport milling machine with which I made most of the parts.
2) My Micro Seiki turn table being machined to accept the tone armís DIN connector.
3) A close-up of the above. Note the lead chip from the layer of sheet lead in the base.
4) The tone arm overall. (minus head shell)
5) The tone arm base and carriage.
6) As above.

Since the pictures were taken, I properly located the tone arm wires inside the left tone arm tube.
Iíll post more pictures soon.


Attached Images
File Type: jpg MY BRIDGEPORT.jpg (970.0 KB, 302 views)
File Type: jpg PA180010.jpg (945.5 KB, 293 views)
File Type: jpg PA180006.jpg (964.3 KB, 280 views)
File Type: jpg TONE ARM OVERALL CROPPED.jpg (662.9 KB, 285 views)
File Type: jpg TONE ARM BASE 1.jpg (972.6 KB, 284 views)
File Type: jpg TONE ARM BASE 2.jpg (968.2 KB, 207 views)
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Old 6th April 2013, 12:39 PM   #119
RCruz is offline RCruz  Switzerland
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Very good work.... thank you for sharing

What kind of servo do you need ?

Mechanical servo, electronic ? How do you feed the servo ?
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Old 7th April 2013, 07:22 AM   #120
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Default Hello RCruz,

Thank you for your comments.

I need a microcontroller based electromechanical servo.
I am attaching a block diagram of the planned servo.
The microcontroller should provide the various stepping motor frequencies needed for tracking the groove and for traversing the tonearm accross the LP. I have a list of the frequencies needed.

I know enough about electronics to know what I need but not enough to design the circuit myself. I know how to prototype it and build it once I have a circuit diagram.

It is my intention to custom make the tonearm or interest a manufacturer in marketing it.


Attached Files

Last edited by Straight Tracker; 7th April 2013 at 07:35 AM. Reason: Rotate PDF
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