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Just curious - what is the size of the bearings with your arm?

Nice! Not so long ago I saw a couple of videos about oiling the watches - couldn't imagine how important and difficult it is to put the tiny drop of oil just on the right spot. Fascinating stuff. As you've been talking tonearm-bearings-jewels...and rabbit/black holes, I posted a photo of a...

Here, a photo of one:

You surely must have one of these: BTW, I love how anal @NeverSatisfied and you are about details. Excellent work...from both of you!

J!m, you're calculating with wrong elements! Use veritasium and then it all falls into place - settling on the "baby"-Pioneer, instead of SX-1980, means a minimum of 1.2K profit. Now take that and go with a "baby"-Studer for 1.1K... ...which leaves you with yet another 100 in profit. At the...

Derek, your guess is spot-on. Actually, Revox/Studer decks (B710, B215, H1, A710, A721) are the only dual-capstan decks with full direct drive - both capstans and both reels are driven by their individual motor. BTW, my first two replies to you are links. ;)

Hehehehe...

Yep.

OK, I'm nearing the end....you wish! The effective mass of an object (arm + counterweight + cartridge) is the sum of effective masses of the parts. I did throw some other numbers around. Fequency: - SME-Ortofon with cartridge calculated as point mass is 8,11 Hz, with mass moment of inertia...

Some may have already seen it, but for the sake of fun...this is how a cassette tape looks like: No shell, no guides, no brain!

I might have misunderstood you due to the language-barrier at my end. Yes, of course distance affects effective mass and resonant frequency. I wanted to show that the moment of inertia/effective mass of a body (tonearm + counterweight + cartridge + shell + screws + shims + what-not) is equal to...

Hi J!m, this is how the mass moment of inertia behaves. It's a simplified example, but the principle is correct. Let's say m1 is the cartridge, m2-4 is the arm and m5 is the counterweight. The effective mass behaves the same way - will post equations, when time at hand. EDIT: Messed up...

Fine! I'm going with the Chicago Cheesesteak Sandwich and a pint of Blackout Stout.

The location is already agreed upon - Gillette, Wyoming... the Sundance Lounge it is then! :occasion5:

Excellent, thanks! I knew about it (although it wasn't Micro Seiki...here's a new one) but couldn't find it. If dimensions and mass of the sliding weight and counterweight are known, effective mass/resonant frequency can be calculated for different positions of them. I don't know the arm's...

All excellent points, J!m! Here's mine... We want to buy one of the cartridges mentioned (let's stick with Ortofon). Prior to doing so, we want to verify that it is a good match for the SME - or any! arm for that matter - by filling data into the formula or a calculator (Vinylengine for...

Yes, but...no! I'm not changing anything physically (effective lenght, positon of counterweight/effective mass of tonerm with counterweight). It is all exactly as stated by SME and Ortofon/audio-technica. Just looking at the effective mass of the cartridge which doesn't equal the mass of same.

Yes...but I'm not changing anything - as stated in post #1, I deliberately chose a specific arm and a specific cartridge so that we have a common basis for discussion.

Thanks for your input, guys! :thumbup: Perhaps I should have asked specific questions?! Is simply adding mass (of the cartridge, screws, shims, shells...), instead of their effective masses, to tonearm's effective mass (mixing apples and oranges) negligible or not? Pointer: Take into account...

This is exactly what I'm trying to bring across - it shouldn't be requiered of you to know anything about the stuff discussed, but to fill the formula with numbers to check/assure your arm-cartridge-combo is within the desired frequency. I can't comprehend how manufacturers are unable to...