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Self Build Turntable

Posted: 12 Jul 2019 16:18
by major190
Any thoughts on the support of the record on turn table. individual points v continuous mat.

Re: Self Build Turntable

Posted: 12 Jul 2019 20:07
by lenjack
Reinvent the Maglev?

Re: Self Build Turntable

Posted: 12 Jul 2019 21:08
by Solist
Well, I think that a mat which will support the whole record and have a recess for the label should be superior compared to a "levitating" record.

You want to avoid any vibration of the record. A mat which supports the record on only a couple of spots, can't possibly damp the record like a good traditional mat does.

And if you want to put a record on points in order to isolate it from the vibrations of the platter, a platter should not vibrate in the first place -or at least vibrate as little as possible.

It would be best to work on designing a platter/bearing/motor/drive type and plinth with minimum possible vibration in the first place, rather than trying to solve this problem with a point to point mat.

It's just an advice. There is a lot written on turntable mats made of different materials and composites.

Re: Self Build Turntable

Posted: 12 Jul 2019 21:22
by aardvarkash10
apply physics. Make a choice between point loading (higher, localised pressure) and the lower distributed pressure of a normal platter and mat system. Mats are definitely easier to implement.

Some manufacturers have implemented point contact platters but almost everyone goes to full mats. Kinda tells the story for me.

Re: Self Build Turntable

Posted: 12 Jul 2019 23:20
by nat
Or Transcriptors.

Re: Self Build Turntable

Posted: 13 Jul 2019 01:58
by KentT
If I were building one, it would feature, a Granite top plate. Heavy platter, idler drive, a la Russco. Biggest Hysteresis-Synchronous AC motor available in the Bodine class, 3 speed on the tree gearshift speed lever, with variable speeds available. Big, heavy, and massive. High performance plinth system, all business. As quiet and as rumble free as you can get. Built to last forever with only simple maintenance. 3 arm boards, one of the arm boards being 12" capable.

Re: Self Build Turntable

Posted: 13 Jul 2019 04:29
by Alec124c41
It would be easy enough to try variations of spot/stripe/solid mats, using peel-and-stick cork shelf-liner. You don't have to stick it to the platter, of course.
I bought a roll for $5 a few years ago, made a few mats, and still have some left.

Cheers,
Alec

Re: Self Build Turntable

Posted: 13 Jul 2019 20:08
by KentT
Interesting mat idea, Alec. Nice idea and thought.

Re: Self Build Turntable

Posted: 14 Jul 2019 16:35
by major190
Thanks guys for your thoughts. Will probably try Alec’s idea and experiment with cork. Think you can get furniture protectors in cork of different diameters.