DIY TT

@vinylzone The Self Built TT, looks very nice, the Acrylic or Polycarbonate Plinth Material is a nice touch.

The Acrylic when used as a thinner sheet and assembled to be used as a CLD Structure has produced quite attractive damping measurements.

I am sure the CLD structure will not have the same aesthetic as yours if clear sheets is used.

As for structures, I also see a further thought has been given to the Sub Plinth Structure as well, I have been carrying out investigations into assemblies across the years and have been quite surprised by some of the discoveries made.

It is interesting how a Plywood Board has proven itself as a Tier in a Structure and is seen on a regular basis used as a Tier in a structure under a TT.

There also appears to be an additional two Tiers of Acrylic used in the structure, this also of interest to me. 

Have these materials been selected through trialing them for their impact on the SQ being produced, or are they used as the initial design for a support structure as they were readily available.  

@holmz  The link is a worthwhile read, Juergen contributes within this thread on a selection of his owned TTs.

There are other long term users of other Brand Models who offer reports on the impressions that have been made.

It has a good selection of commentaries on a range of Vintage Brand TT's with different motor drives in use. 

To get the maximum benefit of the reports, a right click usually works, with the selecting translate on the pop up tool bar, it might have to be repeated as the pages are changed.

@holmz This is one link I had forgotten I had bookmarked.

It contains images that will surely get the creative thoughts working overtime.

https://www.avsite.gr/forum/threads/dd-turntables.178381/

The Through Section of the JVC shows a substantial material has been selected for the Chassis and the walls and base of the Recessed Bowl.

The Bowls role is usually to house the Stator and additionally is used to support the mounting of the Platter Bearing Housing.

I have seen a selection of DD TT models that I have shown an interest in that has a wafer thin bowl wall material as a comparison to the JVC.

I have also informed a engineer friend who had one of the models with a very thin bowl material and the outcome of their investigations was that a flexion has been occurring and this energy is most likely to be received by the Cartridge.

The flexion will also show as an eccentric rotation and this a independent speed strobe will show the eccentric rotation will impact on Speed Stability.

The eccentric rotation will also impact on the stylus interface within the Groove and will most likely be a cause of a distortion.

Such conditions that are transferring energy to the Cart’ and impacting on the Cart’s Geometry when in the Groove, when present, will not enable a Hi End Tonearm and Cartridge to perform at their best.

The cost associated with such ancillaries and the compromised environment they are potentially being used in, will hopefully have been identified in advance by the user and have been accepted as an acceptable condition to continue with.

There are methods known for a recess bowl produced from a poor quality material, to make a recess bowl and bearing base rigidly secure and substantially decrease deflection, maybe even eradicate it.

thanks @rauliruegas 

There's actually a Townshend rock group on facebook that is run by a guy called Matt McNulty - very knowledgable. Sadly Max passed away recently and he was always open to discussion. I have a copy of the Bugge Thesis and Max was happy to let me share it. It's genuine scientific reasoning - not the usual quackery. The interesting thing was that it hints to the fact that bugge wanted to use this on a direct drive turntable motor unit. I am gonna do it with a Sony TTS8000

It contains images that will surely get the creative thoughts working overtime.

…

The Through Section of the JVC shows a substantial material has been selected for the Chassis and the walls and base of the Recessed Bowl.

Reminds me of a hemispheric resonator gyroscope.