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Old 15th April 2018, 10:29 PM   #1391
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by billshurv View Post
Thank you.
I don't have a hard copy but the wear test is 20k, 18k, 16k, 14k, 10k and 5k tones on inner most and outer most grooves at low levels. The last audible tones on each set should be the same. At my age it's likely I would only hear the 10k and 5k. This test would clearly be better using a recording of the tracks.

The STR 120 has inner, middle, and outer groove 500-50k sweeps that show the frequency losses better.
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Last edited by scott wurcer; 15th April 2018 at 10:34 PM.
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Old 15th April 2018, 11:09 PM   #1392
billshurv is offline billshurv  United Kingdom
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Ah good. I didn't think there was anything magic I had missed.
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Old 16th April 2018, 01:55 PM   #1393
scott wurcer is offline scott wurcer  United States
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Originally Posted by billshurv View Post
Ah good. I didn't think there was anything magic I had missed.
Yes, they don't separate the expected loss from what they call "wear loss". I found another interesting result, the sensitivity to warp/off-center seems to vary a lot with frequency and radius. I'm not sure now if the plots only looking at magnitude show cantilever resonances 20k-50k.
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Old 19th April 2018, 07:04 AM   #1394
Johnny2Bad is offline Johnny2Bad  Canada
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Informative paper on FemtoLaser capabilities and uses.

Maybe not vapourware after all.

Femtosecond laser micromachining: A back-to-basics primer - Industrial Laser Solutions
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Old 19th April 2018, 10:29 AM   #1395
billshurv is offline billshurv  United Kingdom
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femtosecond lasers are not vapourware. Cutting a 500m long track with one may be slightly more than has been tried before by a factor of many orders of magnitude.
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