lead vs sand

[IZHAKKATZ]

Hi all,

Could any one give me the cons and pros of sand vs lead.

I've attached my planed platter and splint design with cavities for send/lead.
Any remarks on the geometry of the cavities?

Thanks

[rcavictim]

If I'm not the exception you may get more people to look at your picture if you post it as a .jpg. For me to open a zip file is so much effort changing screens and having to get out my secret .zip decoder ring, I just cannot bother, even if it is something I'd really like to see. The other problem I fear is to go through the un-zip process it leaves a trail of memory consuming garbage in my computer after I finish viewing. Some folks like zip. I never got used to liking it.

[rcavictim]

As a general reply to your question. Lead is just dead weight so will make something it is attached to have a lower resonant frequency. Sand on the other hand while doing the same through the mass factor can also absorb vibration and convert some of it harmlessly to heat.

[analog_sa]

Zipped bmp is indeed pathetic.

I have a personal dislike towards sand - it seems to rob music of life and dynamics when used in platforms and will probably do the same in a turntable.

convert some of it harmlessly to heat

Nothing harmless about that. It's clearly frequency specific and as other types of excessive damping doesn't sound good IMO.

Based on successful commercial designs lead or oil/lead seems to be a successful combo and will provide reasonable damping and great inertia. Plus, it's bad for the environment which is another hint it may sound good

[IZHAKKATZ]

Thank you for your replies,

I've drawn my TT using Autocad 14.
I can not export to Jpg.
Any other sugested formats?

Thanks
Izhak

[rcavictim]

.gif

You could print it locally from Autocad. Scan print with flatbed scanner making a .jpg.

[Brett]

Originally posted by analog_sa
I have a personal dislike towards sand - it seems to rob music of life and dynamics when used in platforms and will probably do the same in a turntable.

Nothing harmless about that. It's clearly frequency specific and as other types of excessive damping doesn't sound good IMO.

I disagree strongly. My TT's are on a large sandbox, with lead/oil/sand plinths on two of them.

Based on successful commercial designs lead or oil/lead seems to be a successful combo and will provide reasonable damping and great inertia. Plus, it's bad for the environment which is another hint it may sound good

It is good, but I can't see how it's bad for the environment when it's enclosed in a case.

[analog_sa]

I can't see how it's bad for the environment when it's enclosed in a case.

Absolutely. That's what i tell my wife whenever she finds my mercury stash.

[Geek]

Originally posted by IZHAKKATZ
Thank you for your replies,

I've drawn my TT using Autocad 14.
I can not export to Jpg.
Any other sugested formats?

Thanks
Izhak

Go to http://www.xnview.com and download XnView - a great little freeware image viewer, tweaker and converter. If you don't need the viwing or tweaking, just get Nconvert.

1-bit binary PNG or GIF will be the absolute smallest size for a linedrawing.

[IZHAKKATZ]

Thanks Geek,

That was very helpfull.

I've attached the file in jpg.

If I'll use lead it seems like I need to decrease the lead vol. or it would be too heavy. (for both platter and splint)

Izhak