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In Reply to: RE: Stylus life based on stylus type? posted by dtyoshih on December 20, 2014 at 11:11:16
I believe the life of a conical diamond stylus is between 500 and 700-hours. With regard to elliptical, it depends on the specific type. Some elliptical styli are simply conical tips with the front and rear face flattened. This type of elliptical will last no longer than a conical in my opinion. The hyper-elliptical or true elliptical should provide at least 1000-hours of play. All line contact styli should provide at least 1000-hours of play or slightly more. However, I think 2000 hours and above is wishful thinking. YMMV
Best regards,
John Elison
Follow Ups:
I understand why the ML/MR types would last much longer based on their cut and the way it wears. I'm curious about the differences between conical, pseudo elliptical, and true elliptical. Wear rate should be determined by force per area so a large area with larger force might wear at a rate similar to a smaller area with lower tracking force, i.e. a 0.7 conical at 3 grams vs a 0.3 x 0.7 elliptical at 1.5 grams. Would the wear be significantly different? Also, would true ellpticals (for instance square shank nudies) last a bit longer due to their diamond being of much higher quality?
This is of interest to me and I am not challenging your statement, Mr. Elison. I am hoping to learn something from you.
Kind regards.
> 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
> > On the other hand, I agree that the quality of the diamond might be a factor, too. < <
As flood2 stated, amongst other factors, the specific grade of diamond used HAS ALWAYS been a very important consideration in regard to establishing stylus life-span, albeit the type of shape.
Thank you for your response. I appreciate your time very much.
Merry Christmas.
Wade
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