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DIY linear tonearm
DIY linear tonearm
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Old 27th September 2013, 08:40 PM   #721
spinning wheel is offline spinning wheel  Netherlands
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Default carbon tube / polycarbonate carriage

This is going to work out far better 14 Gramm w/o cart and CW .

Paul
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Old 27th September 2013, 09:05 PM   #722
dimkasta is offline dimkasta  Greece
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How about something like that for the carriage T part?

Real Carbon Fibre/Fiber Flat Sheet in 3mm A4 (Rigid Panel Not Vinyl Wrap) | eBay
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Old 27th September 2013, 11:14 PM   #723
vynuhl.addict is offline vynuhl.addict  Canada
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Approx 30mm from platter surface to the bottom of the tube, 35mm to center of the tube.



Colin
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Old 28th September 2013, 12:36 AM   #724
Golana is offline Golana  United States
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Which is relative to, tip of stylus, to top of level cartridge.
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Old 28th September 2013, 05:57 AM   #725
vynuhl.addict is offline vynuhl.addict  Canada
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Golana,


Exactly as it states, platter top to bottom of glass tube.

Polycarbonate is great stuff, easy to work with, easy to cut and holds its shape well. It's also light, and stiff enough for this use.







Colin

Last edited by vynuhl.addict; 28th September 2013 at 06:01 AM.
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Old 28th September 2013, 10:13 PM   #726
dimkasta is offline dimkasta  Greece
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Yesterday I spent almost the entire evening looking for bearings on various RC shops... It seems that 9mm outer diameter is pretty uncommon for RC cars. I think only Kyosho has something close to 10mm. Not to mention that non-Chinese ones are OMG expensive...

Add to that the crisis that makes everyone here reduce their stock...
So I came home empty handed...

At least one of the shop owners was kind enough to point me to a local SKF dealer. SKF seems to be the supplier for the cantus bearings as well, so this sounds nice. Unfortunately those industry oriented shops are open only on office hours, so I have to wait till Monday to check it out.
But a look at their range is very interesting.

What almost immediately caught my eye are linear bearings which sound very promising, and industrial hardened axles which are designed to be harder than the bearings.

The axle stuff is pretty self-explanatory and might add to the total rigidity of the thing without the need for inner thread or additional rigidity rods.

The linear bearings also sound nice. Some research showed that they tend to be a bit on the stiff side, but I think this can be overcome by using an oversized one and let it hang on the rod.

Anyway. Even if you do not feel adventurous enough to experiment, the SKF rods and bearings are definitely worth a look. I just hope that their pricing will be reasonable
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Old 29th September 2013, 01:03 AM   #727
hottattoo is online now hottattoo  United States
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Hi,
dimkkasta:

If you put "diy linear bearing tonearm" in You Tube you will find someone who has done this a while ago and seems to work.

I think the linear bearing is too heavy when you add the carriage, arm and cartridge.

Joe
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Old 29th September 2013, 07:43 AM   #728
Calvin is offline Calvin  Germany
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Hi,

regarding moving masses it may be helpful to take a look at a working design.
This can be found in Clearaudio publications.

jauu
Calvin
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Old 29th September 2013, 08:36 AM   #729
vynuhl.addict is offline vynuhl.addict  Canada
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Thanks for that post Calvin, if, and only if those specs are accurate this places the horizontal mass at 30g plus before cartridge, I'm willing to bet this arm wasn't designed around high compliance cartridges since essentially they are a thing of the past in many regards. The majority of existing carts are mid to low compliance anyways now, with perhaps the exception of the Shure m97 since the v15 is no more.



Colin
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Old 29th September 2013, 09:26 AM   #730
neugruen is offline neugruen  Germany
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Default Clearaudio TT1

Another interesting document from Clearaudio is their patent on the TT1. Worthwhile reading:
https://depatisnet.dpma.de/DepatisNe...102006052913B3

Wilfried
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