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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Re: Do you know what a moment of inertia is? posted by ER on January 10, 2007 at 16:30:15:
For a first cut the small or at least short items can be considered as point masses and the classic M.R^2 formula applied. Long thin parts such as the arm tube need a further elaboration: use the point pass formula taking the geometric centre as the centre of mass but then add the moment of inertia about the centre of mass. For a long thin object the moment of inertia around the centre of mass is M.L^2/12 where L is the total length.The most difficult part to determine will be the "rider" which interfaces with the bearing tube. Fortunately it will also have a small impact on the total effective mass because it is, perforce, so close to the pivot. If you post a drawing of your proposed rider I can work it out for you and run you through the calculation.
Mark Kelly
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Follow Ups
- Basically - Mark Kelly 02:53:41 01/11/07 (3)
- Re: Basically - ER 11:20:46 01/11/07 (2)
- Re: Basically - Mark Kelly 04:55:14 01/12/07 (1)
- Thank you... - ER 16:28:16 01/12/07 (0)
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