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Old 16th July 2013, 11:25 AM   #111
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Slowmotion,


It's a borosilicate glass tube used for lab pipettes, glasswork, I just used a new 10ml pipette and cut it up. You can also get stock glass tube.


To add to the arm trials, this last carriage is the one that beats all of them, wow, vinyl playback sounds open, dynamic, and imaging to die for!!

Colin
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Old 16th July 2013, 11:55 AM   #112
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Old 16th July 2013, 12:22 PM   #113
jamikl is offline jamikl  Australia
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Have "U" section outer race bearings been mentioned on this thread. I have seen them in some bearing supply catalogues and wondered, apart from the fact that they may be a bit narrow, whether one of these could replace the two races in parallel on your arm.
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Old 16th July 2013, 12:26 PM   #114
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Quote:
Originally Posted by vynuhl.addict View Post
Cats squirrel,

I think rubber o rings would add friction to inhibit vertical play, along with preventing a mechanical path to ground for resonance control.

Colin
I think that there would be low friction, but even a little might be beneficial. As regards the resonance, (I assume you mean of the arm wands?) if you think this would be a problem, connecting the bearings using non-compliant/non-damping materials would allow the vibrations to continue. At least the rubber o-rings would add a bit of damping. And don't forget non-compliant mounting is two way, so what is stopping vibrations coming up through the arm base into the arm?

I like the idea of the design, and I have most of the bits already, I'm just going to have to try it.
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Old 16th July 2013, 05:43 PM   #115
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Just saw these pictures from an interesting Serbian forum thread.

In English via Google Translate.


Click the image to open in full size.


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Old 16th July 2013, 06:49 PM   #116
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by vynuhl.addict View Post
Slowmotion,


It's a borosilicate glass tube used for lab pipettes, glasswork, I just used a new 10ml pipette and cut it up. You can also get stock glass tube.


To add to the arm trials, this last carriage is the one that beats all of them, wow, vinyl playback sounds open, dynamic, and imaging to die for!!

Colin
How are you cutting the glass tube without damage ...?
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Old 16th July 2013, 06:59 PM   #117
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Jamikl,


I've seen the u bearings, but decided to go with the four bearing arrangement since as the way it's laid out promises lowest friction and no yaw.

Resonance is low, this is shown by ultra low surface noise, and tapping the plinth which gives a deadened thump.

Cutting the glass tube:I used a file to score a line into the glass completely around the tube, then it just snaps clean.


Colin
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Old 16th July 2013, 11:10 PM   #118
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Last carbon fiber carriage, 18.0grams with counterweight with no cartridge, 24.5 grams with cartridge, I'd say its about as good as it gets.


Colin
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Old 16th July 2013, 11:23 PM   #119
WayneK is offline WayneK  Australia
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What is the diameter of the glass tube?

Regards,
Wayne
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Old 17th July 2013, 03:46 AM   #120
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How about a name for this tonearm?
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