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RE: Stylus life based on stylus type?

Posted by John Elison (A) on December 20, 2014 at 13:56:15

In Reply to: RE: Stylus life based on stylus type? posted by tubewade on December 20, 2014 at 13:16:29:

> Wear rate should be determined by force per area

Yes, I agree. Styli with greater force-per-area will wear faster than styli with lower force-per-area. True ellipticals and line contact styli have the largest groove contact area and consequently the lowest force-per-area, so they take longer to wear. Conicals and biradial-ellipticals have the smallest groove contact area and therefore wear out faster. Moreover, conicals have a broad groove footprint, so when they wear only slightly, they do not trace the high frequencies as well. Hyper-ellipticals and line contact styli not only have a larger groove contact area, but they maintain a long narrow footprint as they wear so they trace high frequencies better and last a lot longer. However, I believe that once you have over 1000-hours on any stylus you need to check the stylus often. I am skeptical that any stylus can last 2000-hours without causing groove damage. On the other hand, I agree that the quality of the diamond might be a factor, too. YMMV

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