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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Anti skating is pissing me off posted by Biff on April 21, 2015 at 09:37:32:
Since many readers of this forum don't have a formal introduction to the problem of skating force...Imagine a stopped grandfather clock. The pendulum hangs completely vertically. This is our pivoted tonearm. Now, if I attach a string to the bottom of the pendulum and pull straight down, the pendulum will not move because I'm pulling in a direction which is fully supported by the pendulum's mounting. That is, I'm applying a vector cancelled by a vector which passes through that which supports the pendulum.
It's easy to make the jump from here to a linear tracker. The arm is supported at the back. The stylus/record interface pulls the arm straight forward, but it's supported in that direction so there's a balance.
Now, back to our pivoted tonearm. We don't pull straight down on the string because of the overhang/offset angle of the cartridge (which is there to address the bigger problem of tracking angle error). Our stylus/groove interface is like a string being pulled down and to the left (toward 7 o'clock) instead of down**. This vector passes to the right of the pendulum support and is not fully opposed. In this case, the pendulum is obviously going to swing left.
But what if it can't move left? What if we have installed a dowel beside the pendulum so it stays vertical? The pendulum will press on the dowel when we pull the string with our offset angle. This is the force pressing the stylus against the inner groove wall because the arm is not allowed to swing freely.
The way to alleviate the force on the dowel is to install a spring on the right side of the pendulum equal to the force to the left that we will be applying. With the right spring, we can pull the string at a given force at our new angle and still not press on the dowel. The spring can also be a string to a weight hung over a pulley or some other contraption that applies a simple force.
That is what goes on when you use a pivoted tonearm.
**that is, draw a line through the center of the cartridge, and then a line from the cartridge to the arm pivot. You'll see what the new "string" angle is.
Edits: 04/21/15 04/21/15 04/21/15
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Follow Ups
- My analogy for skating force: - Bry 17:00:17 04/21/15 (12)
- That's not the whole story of skating force... - Lew 07:22:47 04/22/15 (11)
- RE: That's not the whole story of skating force... - Bry 07:56:15 04/22/15 (10)
- My only point was that there are two sources of skating force - Lew 13:14:50 04/22/15 (9)
- RE: My only point was that there are two sources of skating force - Bry 14:07:35 04/22/15 (8)
- Tonearms with "underhang" - Lew 08:00:38 04/23/15 (2)
- RE: Tonearms with "underhang" - neobop 12:35:01 04/23/15 (1)
- RE: Tonearms with "underhang" - Lew 07:53:55 04/24/15 (0)
- RE: My only point was that there are two sources of skating force - John Elison 18:31:59 04/22/15 (4)
- Fair enough. - Bry 22:29:46 04/22/15 (0)
- RE: My only point was that there are two sources of skating force - SgreenP@MSN.com 20:46:17 04/22/15 (2)
- RE: My only point was that there are two sources of skating force - Bry 22:33:06 04/22/15 (0)
- I have no idea what you're talking about... - John Elison 21:16:19 04/22/15 (0)
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