The Good Turntable

[Joachim Gerhard]

My wife is a fassion designer so i may already have it in house. Frank Schröder mentioned that option too.

 

[Joachim Gerhard]

I am also building a tonearm.
The tube is precission carbon fiber.
The white parts come out of the 3D printer.
It works after the Well Tempered system.
Dominik has designed the parts.

 

[Joachim Gerhard]

The arm has some unusual proportions.
I arived at the values because i started with a 270mm Pivot to Spindel distance.
Compatibility is not important for me.
Effective Length : 284.8 mm = 11.2" so a bit shorter then 12"
Overhang 14.77 mm
Offset Angle : 19.156°
Linear Offset : 93.445mm
Inner Groove : 60,325 mm
Outer Groove : 146.05 mm
Inner Null : 70.285 mm
Outer Null : 116.604 mm
Maximum Error : 1.63°
Maximum Distortion : 0.816 %
Average Distortion : 0.297 %
This is a Löfgren B alignment.

 

[scott wurcer]

I am also building a tonearm.
The tube is precission carbon fiber.
The white parts come out of the 3D printer.
It works after the Well Tempered system.
Dominik has designed the parts.

Looks like a golf ball and carbon fiber club shaft could work too.

 

[Joachim Gerhard]

sure.....

 

[rayma]

I am also building a tonearm.
The tube is precision carbon fiber. The white parts come out of the 3D printer.

This is great, there's a lot of potential in printed tone arms. Are you thinking of sometime making one printed piece that includes the arm tube?

 

[carolus]

I am also building a tonearm ...
...It works after the Well Tempered system.

Or, like the vintage "Gray viscous-damped arm" ... could be .

 

[Joachim Gerhard]

A complete arm could be 3D printed.
VPI has a commercial model i think.
At this moment i prefer the carbon tube.
It is more ridgid then a printed alternative i think but 3D printing moves on so we will see more printed arms in the future.
If i will make one ? Who knows, maybe.
Carolus, when you search hard and long enough you may find more or less every principle has being tried in the past to make a tonearm.
The Well Tempered principle is attractive for DIY because it is so simple and gives good results.

 

[Joachim Gerhard]

Here you see that the Well Tempred arm does really well to supress the horizontal and vertical fundamental frequency :Well Tempered Test / Helmut Rohrwild – Welcome to audio-intl
I think this performance is excellent. It solves more or less the problem.
I have seen arms with peaks up to 10dB that where much more expensive and complicated.

 

[Joachim Gerhard]

Here is the 3D printed VPI :https://vpiindustries.com/tone-3d.htm

 

[Joachim Gerhard]

here is another idea :Tone arm STL (3D printing) project - who's in? - Page 2 - AudioKarma.org Home Audio Stereo Discussion Forums

 

[canyoncruz]

Not really ground breaking as far as application. Multi-alloy sintering or layering sounds much more promising, for instance creating constrained layers of titanium, aluminum silicon carbide etc into very thin walls for low weight.. But a cool step in the right direction

 

[Joachim Gerhard]

The tonearm i make here is in no way high tech or even espires to be the best in the world. It is simply good and easy to make in the spirit of DIY.

 

[canyoncruz]

Joachim, here is the site for swiss jewels. as you will find, they are quite reasonable and you can order onesy twosy. the cup bearings are cylindrical so you could press them into the tonearm. it would not cost one cent more, other then the jewel cup. Same with the point, ball or stem. what ever you choose with the reciprocal bearing.



Sapphire Windows, Optical Components, & Precision Glass Company for Industrial Markets | Swiss Jewel

 

[Joachim Gerhard]

Thanks for that link.
I use a Spiral Groove tonearm that uses a jevel bearing :Spiral Groove

 

[canyoncruz]

If you wanted to add a magnet:

Disc Magnets - MAGCRAFT® Brand

 

[Joachim Gerhard]

I also work for Bauer Audio.
His arm has a sapphire cup too :
http://www.bauer-audio.de/downloads/tonarmhifi-records.pdf

 

[Joachim Gerhard]

I have not totally given up to lift the platter on magnets. We then whould need magnetic rings with a hole in the midle.
The Spiral Groove SG1 does that. I heard a small improvement but it was in no way radical.

 

[canyoncruz]

cool. seems like the centriod is calculated minus the compliance or spring force of the cartridge. else the centriod would extend past the bearing cage. Would be neet to fond out if the bearing axis is angled from the perpendicular, again aligning to the centriod and moment.

 

[canyoncruz]

I found this site, I am in the process of modding my poor old oracle once again. I am designing e new plinth for it and am seriously looking at 3D printing. Looking for a combination oh high damping and high loss modulus.

check this company out:


Solid Concepts: 3D Printing & Rapid Prototyping Services