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Old 6th June 2013, 03:24 PM   #11
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Here is a way to make a tangential tonearm :
Tonarm
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Old 6th June 2013, 04:03 PM   #12
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Joachim,
With the complexity of that mechanism, looks like a parallelogram, what is the advantage of that over a linear tracking system? I didn't convert that to English but I see the concept. What was the problem with the linear tracking systems such as on the Thorens turntables that I always thought looked like they took care of the inner to outer groove alignment situation?
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Old 6th June 2013, 04:58 PM   #13
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PTFE/PE Bearings seem to be a bad idea .
I thought about it for my next Turntableproject and talked about it wiht an mechanic engineer who works with this every day .
He told me it would not be longtimestable .
Some time later i met Thomas Woschnik and he also says its not a good idea .
He showed me an TT he made in early years wiht a Teflonbearing .
It wobbles like an dogtail soon after few month .

There are better materials for turntablebearings .
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greatings , Dirk
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Old 6th June 2013, 05:47 PM   #14
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Here is a picture of the ptototype tonearm .....
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File Type: jpg good turntable arm.jpg (225.7 KB, 733 views)
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Old 6th June 2013, 05:48 PM   #15
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I am not the designer of the bearing so Dominik should answer.
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Old 6th June 2013, 05:56 PM   #16
brianco is offline brianco  Ireland
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Location: Scottish Borders - Kelso; on the famous Tweed River!
Is it a blackened golf-ball?
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Old 6th June 2013, 06:41 PM   #17
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is a way to make a tangential tonearm : Tonarm
This genre of tonearms is covered more extensively in my thread, if you're interested in reading. What is interesting and what I like about this articulated pivot arm is that the bearings consist of TWO unipivots at the base, with magnetic stabilizing. Pretty cool. But the headshell bearings are gimbal type are similar to the ones on the RS Lab tonearm which I think could be simpler by using good quality old fashion ball bearings.
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Old 6th June 2013, 06:53 PM   #18
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Thanks for the links.
Be Yamamura made an arm like that a long time ago :
Google-Ergebnis für http://www.thefunkyway.com/gearmus/djgear/decks/Yamamura%20Churchill%20J%20turntable.jpg
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Old 6th June 2013, 07:46 PM   #19
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I guess I will have a lot of reading to do to catch up on the differing design elements. What is the basic difference between a straight arm as shown and the S bent arms? I assume it must be a resonant difference or something of the sort.

Steven
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Old 6th June 2013, 08:13 PM   #20
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I think an S bend was the easy way to angle the headshell.
No modern high performance arm has an s shape any more.
You can make a straight arm stiff enough without resonances in the audible band.
I will show you an example in the next post.
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