VTA Adjustment Mechanism for DIY Tonearm? - diyAudio
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Old 16th January 2009, 08:14 PM   #1
InSides is offline InSides  Macedonia
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Default VTA Adjustment Mechanism for DIY Tonearm?

Hi all,
I was thinking about whether I would be, at some point, able to make my own tonearm.

I would start with a simple unipivot design and see whether I have the nerves to go through with more complex designs.

However, one thing that is bothering me is whether I could find an effective mechanism for controlling VTA that allows repetitive settings.

Would there be something that I could find and adapt to serve this purpose?

Basically, I am looking for something that, via a thumbscrew, would allow me vertical up/down movement of the pivot assembly to control VTA.

Any thoughts?
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Old 24th January 2009, 06:12 PM   #2
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My arm (see here ) has adjustable VTA, although it is not very sophisticated.

It's easy to lower the base fraction by fraction bu turning a hex screw. Going up is less easy.

But ... it's easy to make.

Greetings, MArco
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Old 26th January 2009, 03:25 AM   #3
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I was thinking it might be cool to fabricate a tonearm that had adjustable VTA via rack and pinion (think camera tripod vertical adjustment)

-Justin
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Old 26th January 2009, 01:15 PM   #4
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Quote:
rack and pinion
Cool indeed, but I think in the end you'll want to clamp the armpost real tight to a rigid structure.

greets, MArco
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Old 26th January 2009, 03:46 PM   #5
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I agree completely, but the rack and pinion would allow you to get the VTA dialed in, and then you could lock it down (most likely with a thumb screw of sorts).

Now if only I knew how to do metal fabrication...

-Justin
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Old 30th January 2009, 01:19 PM   #6
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Hi, I've been using these:

Click the image to open in full size.

The micrometer heads are readily available and surprisingly strong (they're made to be used as travel stops on machine tools). It gives repeatable vta to stupidly fine limits (0.01mm) and the assembly is rigid enough to use the arm without locking off the slide, though that's an option. I'm sure the construction could be adapted to most arms.

The micrometer moves the top up and down and the bottom plate sits on the arm board and carries a ball bearing fixed to the end of the micrometer shaft. The arm base slides inside an outer, which is made to standard Rega dimensions. This also helps to decouple the bearings from the plinth/armboard.
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Old 31st January 2009, 10:36 PM   #7
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That's a good idea, now if you only could get it chromed!

- Justin
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Old 1st February 2009, 09:53 AM   #8
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The finish is a hard satin chrome - meant to be really durable in a machine shop. Should last for ever being used like this.
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Old 1st February 2009, 03:17 PM   #9
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Oh I know, in fact I still use the same ones given to me by my grandfather. I was just saying they should be chromed for "matchings" sake.
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