Any interest in an acrylic platter group buy, and a bearing?

[markgall]

I am interested as well.

Mark

[mantisory]

also interested.
I am also wondering, would it not be feasible to use a teres motor assembly or something like that?
b

[sklimek]

Interested in the platter and bearing!

[sreten]

some of those bits look familiar : http://www.revolveraudio.co.uk/replay.htm

The large offset between platter hieght and arm mounting plane
could cause problems with arm mounting, looks somewhat awkward.

/sreten.

[Greg Nuspel]

I've been day dreaming again soon I'll start making it.

[Mikewong]

If the combination is within reach,then I would give it a try.

[Nanook]

Please know that this is a unique design and not actively copied from anyone. However, there really only a few ways to skin a cat, if the design parameters are the same or similar. The bearing is unique, the platter is 315mm in diameter, the thickness is 43mm, the label area is .005" deep. Presently I have a 40mm bearing housing, using a 20mm bearing shaft, and a 1mm hardened steel thrust surface. I am thinking that a total length of the bearing/housing will need to be in excess of 60mm.

I agree the tonearm mounting has not been optimized, and that needs to be addressed. I am thinking that a rotating arm board, with a mounting collar and a height of say 1" or so should provide the required vertical offset, and provide enough room to mount a 12" arm if so desired. This could be placed in the existing mounting location or another one.

C of G calculations put it at 18mm down from the top of the platter. The distance between the bottom of the platter and top plinth (or only plinth if so desired) needs to be reduced by at least half. The prototype used an old bearing from an old discarded direct drive (after I threw out the original bearing, because it was absolutely terrible). I'd say that overall, the turntable is easily on par with my Oracle. Even with the bodged bearing the sound is very robust and very quiet. The motor has its own electronics, but I do not like the housing nor the "pillars", they simply are not required unless trying to appear like a Delphi or similar.

Greg, email me directly as cnc machine work may be required.

Thanks to all that may be interested.

stew

[mantisory]

hey stew, i sent you an email.
b

[Vil]

I am interested too ...

[Nanook]

I've been into the States and back today--what a gong show. Blizzard there and back. Picked up some demo loudspeakers, may do a follow up on them in affordable$$audio. Mark had them on extended loan from Totem Acoustics in Montreal. Initial impressions are very good. I need to email Mark and thank him for breaking them in for me.

Because sreten indicated that the turntable prototype looks a lot like the Revolver, I need to do further research to ensure there is no theft of intellectual property. I was handed the turntable in a preliminary state, and tore it apart to literally nothing---all I could find were problems (other than the appearance). mainly the drive system which appears week, and the platter bearing.I have a completely dismantled tonearm to prove that portion. The motor is what I might consider a robust tape drive motor, with a nylon pulley--not the best solution. If it turns out that this table has been in fact "knocked off" or copied directly from the Revolver, then a complete redesign will be done (unless the original source of both of the turntables turns out to be the same place, and they released it to us--if they owned the design).

Like I said I was brought in on this preproduction project to try to get the kinks out of it, and there are quite a few.

This table (the Revolver) presently sells for something like $3350 in Canada with what appears to be an old Audioquest tonearm. Even for the complete table we were aiming for a sub $1800 price, based on manufacturing costs, without tonearm. I was hoping for a turnkey price with a Rega RB250 in the neighbourhood under $2200. Once I can get the new platter price and bearing design and dimensions firmed up, we can set the price for the complete table, and for parts.

Personally I'd prefer to buy all parts and construct the "complete" tables myself so that I know when they go to their final destinations, they have been completely function tested, and speed checked, then dismantled and shipped. Obviously parts is parts, so the bearings and platters would be trial fitted and OK'd. I am seeking local manufacture of the bearing so that QC can be maintained.

so thanks to all for the interest. I'm gonna completely vacate and ignore all things internet for a few days so that I can sort out what's what, double check my bearing design ( which has not been presented to anyone outside of this forum, or my direct business aquaintances.

I will check my email, and respond to all who have posted me, but will ignore all else until at least Monday so that I can actually get some work done.


stew