Best type of metal for turntable platform?


I have someone that owns a CNC machine. And machine for me a metal platform to the dimensions of 16 x 13 x 3. Ive heard aluminum is a good metal vs price for vibration reduction. Does anyone have any recommendations? Any input would help. Thanks. 
deanshias

Showing 2 responses by pindac

Modellers Clay such as the Brand Newplast  has exceptional damping properties and will be quite valuable as a material when used with 
materials that have structural and mechanical properties.

   
To remove the Floor Bounce issue and Vibration Transmission to the 
TT.
A TT Wall Shelf can be used.
It will be at it most effective if a Wall is Bricks and Mortar Structure, if  other structural materials are used, it will be best to seek out the ideal fastening to secure the TT Shelf.

When Looking a a fastening for a Wall Shelf, Do Not ! just delect a fastening as you are familiar with it.
Seek out the ones that has the best Kg Loading for the substrate to be fastened to.
I found mine on Youtube and when fastened into Cinderblock, they are 250Kg per fastening.
There is nothing like such reassurances.  

A DIY Sub Plinth can be made that can control various effects from Vibration.
A low profile 'Side Wall'  1 1/4" (30mm) Tray can be made that is to contain a approx 5/8" (15mm) Depth of Kiln Dried Sand.
This box can be sat on Sorbothane or Similar Footers.

An additional Box will be made, that fits snuggly into the Kiln Dried Sand Tray, a 1/8" (3mm) clearance all round between each boxes 'Side Walls'
should be ample space.

A base can be cut for this Box, that is 1/4" (6mm) smaller that the inside dimension of the Trays 'Side Wall'.

The following is a Crude Version of a early Townshend Design.
It works on par with any type of design using the concept.
 
This Box will be a Housing for a Inflatable Inner Tube, a Side Wall will have a Vertical Slot cut in,  to allow the Valve to exit the internal space.
The Slot allows the Valve to elevate freely when inflating.

The Height of the Side Wall will need to be determined by how much inflation is chosen for the Inner Tube.
When the ideal inflation is discovered  the Inner Tube can be placed on the Kiln Dried Sand, a Dimension can be taken from the base of the of the box that will be approx 10mm above the Kiln Dried Sand
(The inner Tube should be close to 10mm above the Side Wall when inflated, do not make a excessive dimension, as the 10mm will allow the assembly to find a resting place in a controlled manner if a inflation is decreased over time ).
Place the Box with inflated Inner Tube onto the Sand, with the Inner Tube seated on the Sand.

Place the TT on the Box/Sub Plinth and check the TT for Level.
Footers under the Plinth will assist with achieving the levelling that is required, as well as offer a further Vibration Control.

Footers are also going to attenuate the sound, so finding a ideal one is a
personal experience and down to ones preference.
My Footer of choice in direct contact with a TT Plinth is 
 Solid Tech 'Feet of Silence', these were put into Service after using
AT-616.
As said the choice becomes personal.         

Note: The Box with the Inner Tube can be seated in reverse with the Boxes Sub Plinth being seated on to the Sand.

This will allow for 'different material Sub Plinths' to be seated onto the Inner Tube, this is another way to fine tune attenuation to suit a personal preference.

This assembly can be achieved at a reasonable cost and a allocation of ones time, it will offer a vast improvement over a conventional Support/Rack that is in direct contact with floor.

The cosmetics for the finishing will be a little more to be added to the parts used, if the raw honesty is not desirable. 

Apologies for the Long Mails, I'm living in a Lock Down, so Coffees and Keyboard are part of the Day Filler.