TTW MOMENTUS MOMENTUS "The MONSTER" Rim Drive

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.

There has been more than one dissatisfied customer of TTW, mostly based on lack of speed accuracy.

Given all the models, changes, problems, and updates in their short history, the wise consumer should avoid this company cautiously.

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)

Bydlo, You have specifically catalogued all the things that I also do not like about rim drive; I just did not wish to go into gory detail. TTW claims to have addressed at least most of the issues in the Momentus.