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TTW MOMENTUS MOMENTUS "The MONSTER" Rim Drive

I must say interesting indeed - anyone happen to have one or had a listen? Any initial impressions

Some specs ...

- 99.999% pure Copper platter weighs in at 88Lbs 40 Kg's

- Total weight of the whole table tipping the scales of 200-220Lbs

- Bearing Shaft is Pure Micro Grain Carbide .5 inch diameter x 1.5 inches deep

- DC Servo Direct Rim Drive Super Torque with 24,000 pulse drive control (each revolution counts 24,000 points for accuracy and the MOMENT of inertia combined with the rim drive provides perfect rotational accuracy
128x128dev
brf
1,715 posts
 
Just read the TT description. Most TT manufactures would need to sub contract the multi-axis machining to an outside firm due to the capital cost of said machine. Since TTW’s primary business is manufacturing for the aerospace industry, they are uniquely positioned to do all the machining in-house, therefore, reducing both manufacturing and R&D cost.

Now having access to mega-buck machines and having expertise in high precision machining does not guarantee a good sounding table, but TTW must be applauded for their attempt to raise the bar on state of the art tables at a relative affordable cost. Time will tell if they have succeeded.
lewm
13,137 posts
 
TTW has come in for more than a little criticism on this forum, mostly from one or two dissatisfied customers. I am not a customer, but I always thought they deserve a little credit for their "all-out" approach, whether I always agree with their design decisions, or not. (Usually not.) The Momentus does indeed look to be very well built. I am just not a fan of rim drive the way they do it. However, in the Momentus they have isolated the copper platter from the driven part of the platter, which should be good.
sksos1
387 posts
 
There has been more than one dissatisfied customer of TTW, mostly based on lack of speed accuracy.
judyazblues
157 posts
 
Given all the models, changes, problems, and updates in their short history, the wise consumer should avoid this company cautiously.
bydlo
142 posts
 
From how it looks (I'm not familiar with rim drive, more with idlers), the motor drives directly the platter through a rubber O-ring put on it's shaft. I think it's quite a problematic solution: 1) I'm sure they can machine the rim to a great degree of roundness, but it must be matched by the same on the rubber side. I think EMT idlers is a good example here with their machined rubber surface...and even those have roundness problems; 2) The motor is more intimately coupled to the platter than with an idler, which makes it's more visible with all it's cogging.

Also the shaft looks shortish for the 40kg platter, even though it's super hard. Longer shaft=less wobbling (again EMT930/927 is a good example here)
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