What are you doing with your new Teres Bearing

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#22
Wow,
You guys really put the bar high. I wonder if I can make mine as pretty.

Bill
 

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#23
Vinyl-Addict said:


Look familiar? 😉
3 layer 50 pound platter magnetically levitated replaced the acrylic platter last year. Mylar tape driven of course.

An externally hosted image should be here but it was not working when we last tested it.


BTW, Nice job on your table.
Click to expand...

Frank,

Yours is much much nicer than mine. Mine kinda looks like a cheap imitation compared to yours. Being totally honest, I would have never known where to start if it were not for your advise. I owe you big time for your help. BTW, the SME IV works well with the table. My arm pod is not as elaborate as yours. The next mod is an inverted bearing (I will purchase it because the machining is way over my head) and new platter. I have no idea what the platter will be made of yet. Again I wanted to publically thank you for your help, many, many kudos to you.
 
#25
Hi, OMA has a solid ‘slate’ product that they produce from an old mill in Pennsylvania, they use a computerized water jet system to cut the design. Currently they are making plinths but no platters though they can produce a platter to spec and also have a diy forum thread that focuses on slate TT and platters.

I started to play around with a platter design awhile back. Jonathan (the moderator) suggested two .75 thick pieces of slate with a core to bring them together.

I love the look of the slate and can envision a slate plinth plus slate platter. I attached a .pdf file of a design I started to play around with for a slate + core + slate sandwhich platter to see how it would look. This was before the Teres bearing I got. I am now thinking of a design that would be a .75 slate + .75 (stainless or?) + .75 slate.

I hope to get back to this soon but everything in life has been pulling me away from it lately.

Here some OMA links if interested:

http://www.oswaldsmillaudio.com/Products/vinyl.html

http://oswaldsmillaudio.com/forum2/index.php?PHPSESSID=a8373a2f5d6ac516646949a3cd7d0350&board=5.0

attached is a pdf file that can be 3D activated, if the attachment does not work I’ll upload a pic. The Alibre background is dark, if you click the background color tab to a lighter shade it is much easier on the eyeballs…

BTW – VinylAddict, killowattski – WOW!!!!!!
 

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#26
Vinyl-Addict said:


Look familiar? 😉
3 layer 50 pound platter magnetically levitated replaced the acrylic platter last year. Mylar tape driven of course.

Stellar job, nice and clean; impressive indeed!
Can you elaborate on your mag lev design?
1. How did you address strong magnetic field on the platter surface?
2. Did you notice the bearing noise floor drop? I'm asking because magnetic repulsion nullifies the bearing thrust plate interface load (big load on small surface), but in the same time inevitably introduces side load applied to the plateer magnet due to two mag fields concenricity anaccuracies (small load on large surface), which also causes tilting moment if applied not in the middle of bearing shaft.
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#27
livemusic said:
Vinyl-Addict said:


Look familiar? 😉
3 layer 50 pound platter magnetically levitated replaced the acrylic platter last year. Mylar tape driven of course.

Stellar job, nice and clean; impressive indeed!
Can you elaborate on your mag lev design?
1. How did you address strong magnetic field on the platter surface?
2. Did you notice the bearing noise floor drop? I'm asking because magnetic repulsion nullifies the bearing thrust plate interface load (big load on small surface), but in the same time inevitably introduces side load applied to the plateer magnet due to two mag fields concenricity anaccuracies (small load on large surface), which also causes tilting moment if applied not in the middle of bearing shaft.
Click to expand...

#1- I have no issue with mag. field at the platter surface. The bearing is buried deep inside the plinth. You would have to see it first hand to know just how it is located.
#2- The bearing is slightly quieter with the bearing "floating" without a thrust bearing, but to be honest not as much as I had thought it would have been. I decided to modify the bearing to initiate very minimal pressure contact with the thrust bearing because I was not positive that the magnetic spring induced by floating the bearing was a positive thing. My finding was that I like the performance better with minimal pressure on the thrust bearing. Upper frequency response specifically is better, IMO.

There is also no problem with side, at least in my bearing. I went to great length to machine the pockets for the ring magnets to reduce "cylindricity error". I also measured both runout and vertical movement of the bearing when I had it floating and measured 0.002 max. vertical motion. Now this is due in part to the actual platter having very small deviation so I was quite happy with the results in both runout and vertical movement. The strong ring magnets when postioned in repelling fashion close to each other create a very tight spring, extremely difficult to push together the closer they become to each other, but as I said, I prefer the bearing to be seated with minimum pressure rather than float.
Click to expand...
 
#28
Did you measure magnetic field at the record plane?
I've played with a pair of 3" magnet rings placed 4" below the surface and had 20 gauss max close to the spindle. I was not comfortable to keep my MC cart playing in such invironment. I also tried to isolate is with three layers of mu-metal; it didn't help much.
 
#29
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Hi,
This is my new TT with the Teres bearing.
I am using a modified (with black delrin platter and tonearm mounting adjustments) Revox/Studer DD TT for my second TT and DC motor source.It has, superb Pitch stability and high torque silent motor.
Main TT with the Teres bearing has 30mm aluminum plinth with adjustable Alu feet.It weighs 12+ kg.
Platter is from black delrin, 290mm diameter (for ease of record handling) 64.5mm height and weighs 6+ kg.Tonearm supports are Alu parts over delrin bases and fully adjustable for mounting distance from spindle.
Thread is real silk.
Tonearms; rear one is Grace 707 modified with new Stainless Steel headshell which is designed and laser cut to more modern Loefgren A (Baerwald) geometry.Cartridge is Grado platinum Ref.
Righthand side one is Moerch UP4 unipivot.Cartridge is venerable Denon 103 with DIY Cinemag Step-Up transformers.
For a little nostalgia I put a NOS Watts Dust Bug record brush arm also.
Total weight of TT is 20+ kg.
For the sound;
My TT before I began this project was Linn Sondek LP12 with Ittok LVII on it.With Denon 103 also on it it had a wonderful sound not without colorations but highly musical.It was so good that I sold it to one of my friends after his many times of insistences and offers.
This new one is much better.I know It is not because I built it but it has many real improvements over Sondek. Solidity of notes, low noise floor and blackier backgrounds, pitch stability,CD like bass.
The best part is all these improvements are without losing the musicality and listening pleasure.
Now is the time to have more records.
Thank you Bill and the others for group buy.
Best Regards,
Hakan
 
#31
d to the g said:
Delrin is the best platter material I've ever heard.* Orders of magnitude better than acrylic.

*HAVE heard cork, rubber, carbon fibre, several types of acrylic. Still waiting to hear cocobolo and a few other exotics.
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There are very few manufacturers that use Delrin because it is a soft material, absorbs moisture and is not easy to machine because it deform from excess heat. Vinyl Addict uses it in his table but it is sandwiched between two pieces of aluminum and he is a Master machinist. The only two manufacturers I know of that use Delrin are Clearaudio and Rekonut and they both use subplatters. I don't know anyone who makes a pure Delrin platter. I would love to know what delrin table you heard and with what arm and cartridge.
 
#32
I have been using the delrin platter for 5 years on my second (DIY) TT (other than Linn Sondek) without any problems and this was the experience enough for me to use it again.The platter was 24mm in height and new one is 64.5mm so it should be much better for dimensional stability.My machinist friend told me it is not good to use it less than 15mm in height.
By the way I live in Izmir which has a hot climate as in California.

Some general info about its properties below;

The outstanding attributes
of Delrin® acetal resins include:
Toughness at low temperatures
(down to –40°C)

***High mechanical strength
and rigidity

Fatigue endurance unmatched
by other plastics
High resistance to repeated
impacts

***Excellent resistance to
moisture, petrol, solvents etc.

***Excellent dimensional
stability
Natural lubricity
Resilience
Good electrical insulating
characteristics
Ease of fabrication

***Wide useful temperature range
(in air –50 to +90°C with
intermittent use up to 160°C

Regards,
Hakan
 
#33
Two manufacturers using pure delrin platters that I can say without any investigation are TW Acustic of Germany and Blue Note of Italy.
TW Acustic Raven One and Blue Note Bellavista Sig. both are highly raved products.
Blue Note is using acrylic for platter material for less expensive models and Sustarin(copolymer equalent of Delrin) for the top model.
And as you know Raven One was declared Best Buy in some Audio mags. even though it has a price of over 5000USD.

One more thing,
They are using Delrin for making musical instruments (recorders-small flutes)It means tone wise it has a good harmonic behaviour.

Regards,
Hakan
 
#34
We use Delrin for all kinds of things at work. One of the listed uses I have seen for Delrin is as a replacement for metal. The stuff machines like butter and doesn't move. I love designing with it because makes parts cheap to cut and plenty strong. I am planning to make my platter out of a mis-purchased piece of 12"X12"X4" black Delrin. The guy lost his job over buying it, but since we don't have a good use for it, it is destined to make music🙂
 
#35
kilowattski said:


There are very few manufacturers that use Delrin because it is a soft material, absorbs moisture and is not easy to machine because it deform from excess heat. Vinyl Addict uses it in his table but it is sandwiched between two pieces of aluminum and he is a Master machinist. The only two manufacturers I know of that use Delrin are Clearaudio and Rekonut and they both use subplatters. I don't know anyone who makes a pure Delrin platter. I would love to know what delrin table you heard and with what arm and cartridge.
Click to expand...

The Sonographe SG3 uses a 1" delrin platter. I heard it with a RB250 (incognito, tecnoweight) with a Lyra Dorian. Any platter mat made the sound worse. This is a really underappreciated deck. I got rid of mine when I moved my system onto a cement substructure. No need for a sprung deck anymore.

The SG3 also uses a subplatter... also made of delrin. They also used a delrin sleeve in the bearing.
 
#38
after reading that thread. I am curious as to how much Delrin moves after being turned. I haven't measured any kind of measurable movement in the parts we make. Now, none of the parts we make are as big as the platter we are talking about. Of course the size will exaggerate any movement.

I just took a minute to look up it's properties online and this is what I found.

● High strength, stiffness, dimensional stability
● Very low moisture absorption
●Good wear and abrasion resistance
●Wide range chemical resistance (including many solvents)



What is strange about this is that the reasoning given in the linked thread for the movement was absorption of moisture. According to the site I found, it has "very low moisture absorption". I guess low absorption is more than none, but I doubt it would be an issue.
 
#40
Just curious...

I have a Teres table purchased from Chris Brady (cocobolo plinth, Verus motor) but the only platter I could afford at the time was a solid acrylic platter. I'm interested in trying a different platter, but quite frankly I'm not handy enough to create a drag-n-drop replacement (nor am I interested in trashing the original platter).

Can anyone post companies / people who make direct Teres platter replacements out of different materials (and, if possible, the costs of said platters)?
 
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