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Old 2nd September 2012, 06:47 PM   #11
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If the center hole is exactly on center and there are no warps, the mass becomes a non-issue but in the real world those things are not guaranteed so low mass/inertia helps. However low you manage to make the arm mass, it's orders of magnitude greater than the stylus assembly.

G
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Old 2nd September 2012, 09:08 PM   #12
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Maybe I did not manage to make myself clear...but I don't want to hijack this thread so I'll do my own experiments in the proper thread.

Cheers,
M.
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Old 4th November 2012, 10:43 AM   #13
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The inertia to move the arm across the record is felt by the stylus, as the stylus suspension wears or dries up in the case of Audio Technicas' small rubber O ring the inertia creates record wear. Force times distance is the amount of weight you bring to bear when tightening a nut and bolt, so if you imagine removing your car wheel nuts with a small hand spanner against a socket set with extension arm you can see that less inertia is required with a long extension arm than a small spanner. Apply this back to your arm/cartridge and the longer arm requires less force from the stylus to move the arm across the record.
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Old 4th November 2012, 03:49 PM   #14
jlsem is offline jlsem  United States
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Once the static inertia (or moment of inertia) is overcome in the first revolution then there is dynamic inertia related to the rotational velocity of the arm that is present. As the rotational velocity of the arm increases ever so slightly with each subsequent revolution the inertia of the rotating arm builds. I would definitely like to see some experimental data that show these almost infinitesimal changes in inertia related to rotational velocity actually cause any audible distortion. It occurs to me that the rolling friction of the gimbal bearings is more important that the moment of inertia of the tonearm.

John

Last edited by jlsem; 4th November 2012 at 04:08 PM.
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Old 9th November 2012, 11:20 PM   #15
sled108 is offline sled108  United States
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I have Made, and Listened to this style Nanook Arm...And, it's really the Most Satisfying and Great Sounding Uni-Pivot DIY Arm that you can do without a Shop...I am Planning on making another, with a Carbon Arrow Shaft...So, I removed the Out-Riggers to see if they where Needed...And Yes, They Are...It will Wobble on the Vert. as soon as you Lift It...I put Them back On...And, I can Lift It, and Drop It into the Groove with No Vert. Wobble..
Click the image to open in full size.

Last edited by sled108; 9th November 2012 at 11:32 PM.
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