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Been playing with turntable motors and pods. So I am now playing with better isolation for table and the motor pod.
Been playing and reading for years and of course there people on both sides of the fence on every concept. I know I will have to try them all in my system but I thought I would ask a basic physics question before I start building proto types.
So say you had two sheets of 3/4 inch MDF etc 2ft x 2ft. And 10 pounds of lead. Now you could glue/bolt the MDF together and then drill holes in it and fill with 10 lbs of lead shot. Or you could use 10 lbs of lead sheet between the 2 layers of MDF. My thinking is with the layers the vibration has to go through the lead. With the holes the vibration can just travel across where the MDF is touching.
So hopefully someone here can shed some light of this.
Thanks Tom
Follow Ups:
Ingeniuty trumps sheer mass.
My DUAL TT had a 2-piece platter. Each piece rang like a bell, but at different frequencies. Together? They damped one another out and had a VERY low resonant frequency.
The Stereophile article of a dozen or so pages should only take a couple HOURS to plow thru.
Too much is never enough
Hi Pictureguy
Looks like I have some home work.
Thanks for the link
Tom
If I'm reading that right, what you want is to use the lead to make your two sheets of MDF heavier. What I would do to best distribute the weight and get your lead layer spread as evenly as possible is to glue the two together, but instead of holes, make a large depression using a router that will hold the shot in a single layer.
You can then add a third, thinner layer of MDF and veneer the whole thing to look like one solid block of your favorite wood.
Manny
I have done that numerous time with MDF and hardwoods. The question is with a lead sheet no MDF would not be touching each other the vibration would have to travel thru the lead sheet. The other way one could argue the vibration just travels where the MDF touches each other and by passes the lead.
Thanks Tom
A 5 sided box filled with lead shot with the top plate just sitting on the lead shot (not touching the 5 sided box at all).
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Perhaps that would work.... I've often wondered what kind of measuring gear a home enthusiast could cook up to test various configurations and determine which is best.
I am always willing to spend valuable DIY time making a project look better, but I despise wasting it on tech if another, quicker method gets the same result.
Back in ancient audiophile history, there was a tweak, much like your first idea, that is best described as a "sandbox". The sand was said to add mass, making the box more difficult to disturb and to dissipate any vibrations going into the box whether from the top platform or coming up from the surface the box was mounted on. Of course, those who used the tweak had to consider the weight when locating the box. IIRC, the original Mark Levinson firm was said to have used a similar but much larger setup for one of their TTs that used a Decca cartridge.If you've got the right tools or access to someone's wood working shop, you could easily make the box, add the sand, and place your TT platform on top of the sand. Just make sure that the TT platform is sized to allow you to remove it and give you access to level the sand.
Edits: 08/22/16
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