quiddity
Responses from quiddity
| Micro SX-8000 II or SZ-1 T BoneThe equivalent mass given by OMA is calculated according to the method I used.It's not the mass of a platter equivalent to the total inertia of the system, this would be even higher (around 400 lbs). IIRC Win decided to use the more conserva... | |
| Micro SX-8000 II or SZ-1 The system seems to have eaten the post on equivalent mass, so I'll do another. The idea is analogous to the method of calculating equivalent mass for tonearms and the calculation is the same: divide the moment of inertia by the square of the rad... | |
| Micro SX-8000 II or SZ-1 T-bone The problem with that idea (besides complexity) is that you lose most of the advantage of running an external flywheel because your gearing ratio is much reduced. Using the effective mass analogy as given above, a 5 kg flywheel of 150mm dia... | |
| Micro SX-8000 II or SZ-1 The required figures are in the link provided above.The motor / flywheel has an inertia of 5.1 x 10^-3 kg.m^2. It turns at 750 rpm, so the inertia referred to the platter is multiplied by the square of the gearing ratio. 22.5^2 = 506.25 so the tot... | |
| Best way to store a cart Glad you like it. BTW the reason for specifying glass and metal is that most polymers are highly permeable to oxygen. The exceptions (such as PVDC (Saran) and EVOH) can be hard to find. | |
| Best way to store a cart A glass jar with a tight fitting metal lid and a single sachet of commercial oxygen absorber such as AGELESStm. These are easily available through your local [strike]paranoid fantasist[/strike] "survivalist" supplier. | |
| Kudos to speed controllers Arrgh! Stupid software! The above was in response to Perrew. To JLoveys, again I don't wish to discuss vapourware but in general optimal results require that a controller be tuned to the motor it is to run. As long as the parameters required are r... | |
| Kudos to speed controllers Let's not turn this into a discussion of vapourware. I'd prefer to be judged on results. Mark Kelly | |
| Kudos to speed controllers JLoveysI disagree profoundly. The 124 uses either a shaded pole single phase motor or the Papst three phase (one replaced the other).Both of these are distinctly improved by a dedicated controller. Of course the controller involved is different in... | |
| Kudos to speed controllers DreI sorry if I came across too strong, it's not your understanding of the situation to which I am taking exception. I guess I overstepped the mark but I'm not keen on my designs being called "similar" to others.By the way, the reason that the sin... | |
| Kudos to speed controllers I'd like to take exception to the statement that the Synchrotron AC-1 is similar to the Basis unit. Perhaps I should say "was", the AC-1 kit has been withdrawn permanently.The AC-1 was an original design which used a different circuit topology to ... | |
| Garrard 301 & Thorens TD 124 voltage Both these decks use shaded pole motors which are a form of asynchronous induction motor. Like all such, some of the power supplied is used to induce the magnetic field in the rotor.The rotor field is induced by relative motion (slippage) between ... | |
| Tonearm effective mass RaulDoug is completely correct as long as the dimensions of the counterweight do not change*. Remember that "effective mass" is actually the moment of inertia of the arm divided by the square of the pivot to stylus distance. Doubling the conterwei... | |
| 2008 RMAF – – – all things analog. RalphSorry for jumping on you but this keeps coming up and it's just not true. The Papst motor ex the empire TT has less than 2 watts of output power. Even the small Hurst motor and the Airpax (Linn etc) have more power (and therefore more torque)... | |
| 2008 RMAF – – – all things analog. RalphYou have repeated the Furphy about belt drive motors being "weaker" than idler motors. To use examples from this thread, each of the motors from the HRX has about 3 times the output power of the motor in the Saskia.Douginteresting how an inte... |