My 1980's Tangential Tone Arm and my 2010 improvement - Page 4 - diyAudio
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Old 17th December 2010, 07:07 AM   #31
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Almost missed this thread. Very impressive work. I'm tuned in now!
Thank you.
Currently, I'm waiting for some carbon fiber tubing to come from Germany.
Next week I'll probably have some new photos of the latest stand of the 2010 version of my tone arm.

Sincerely,

Ralf
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Old 17th December 2010, 10:01 AM   #32
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Great work!
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Old 17th December 2010, 10:09 AM   #33
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Great work!
Thank you.

Sincerely,

Ralf
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Old 24th February 2011, 11:09 PM   #34
gninnam is offline gninnam  United Kingdom
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Any news??
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Old 24th February 2011, 11:17 PM   #35
kevinkr is offline kevinkr  United States
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Any news??
I'm interested as well. Intriguing design..
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Old 24th February 2011, 11:44 PM   #36
lowpoke is offline lowpoke  Australia
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Any news??
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Originally Posted by kevinkr View Post
I'm interested as well. Intriguing design..
Me too.
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Old 25th February 2011, 01:31 AM   #37
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Very interesting design!

When you are ready to go into production (or need a couple prototypes) I have a great machine shop I work with who has VERY competitive pricing.

(I'm currently working on a conventional tonearm that is 14.215" long (effective) to reduce tracking error. I look at your original design because I have looked at older 'similar' ideas and they have been found to be rather difficulr to impliment due to the number of bearings required and the resultant bearing noise/slop/sticktion etc. (I do like those weird rotary spring things however)

From me: BEER=><=YOU
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Old 25th February 2011, 06:50 AM   #38
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What an ingenious and elegant design, Ralf. I'd expect that one day soon you might have such an arm for sale in the Music Direct catalog and/or other audiophile outlets.

Your thread here caught my eye as I'm in the process of building a tangential arm, but of the linear track design (servo operated and running on polished rods), roughly based on Rod Cooper's plans in the book "The LP Is Back!".
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Old 25th February 2011, 08:01 AM   #39
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Default Hello gninnam, kevinkr, lowpoke and Jim Leach

News, you ask? Actually I've been working on the parts almost every day.
I should have some photos next week or certainly the week after that.
My goal is to dynamically balance the arm. I went from brass to copper for the counterweight but couldn't get the center of gravity low enough without interfering with the base of the tone arm. I finally remembered machinable tungsten alloy which has a specific gravity of 18.5 grams per cubic centimeter. It took some time to find a supplier who would sell me a small quantity.
I do the necessary calculations in my CAD program so that I don't actually have to make experimental counterweights.
I did discover something though that everyone else probably already knows:
You can have a counterweight of a given mass 3" behind the tone arm pivot or you can have a counterweight of a greater mass 2" behind the tone arm pivot. the question is: how do you optimize that relationship?

Jim Leach, you're the first one to have discovered my use of "Free Flex Pivots" or weird rotary spring things as you call them.
I'm going to use them in my new Arm also. for both the horizontal and vertical bearings, four in all.

Sincerely,

Ralf
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Old 25th February 2011, 08:19 AM   #40
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Default Hello popeetheus

Thanks for the kind words.
Hopefully you'll keep us informed as to your progress.
My original Arm was servo controlled. Both my original Arm and my new Arm run on polished 17-4 PH stainless steel rods.
I'm going to try operating my new Arm by the pulling friction between the stylus and the vinyl LP. I know that that will work. The question is: how accurately?
I allowed enough space in the base of my new tone arm to include the components of a servo in case the friction drive is not accurate.

Sincerely,

Ralf
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