Stylus Evaluation Imaging

the thin end of the wedge
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chiz
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Re: Stylus Evaluation Imaging

Post by chiz » 03 Feb 2017 14:25

Thanks for sharing your amazing images Ray, keep 'em coming!

jdjohn
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Re: Stylus Evaluation Imaging

Post by jdjohn » 03 Feb 2017 14:37

Simply amazing shots! Makes me not want to post any of my own :( Maybe I can send my styli to Ray for a photo session :D

ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 04 Feb 2017 06:06

Thanks all for the kind words.

Here is an AT231LP. This cartridge is supposedly a "line contact", but I am not seeing it. Looks more like a hyper-elliptical:

http://i943.photobucket.com/albums/ad27 ... LP_L_A.jpg
http://i943.photobucket.com/albums/ad27 ... LP_R_A.jpg

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 04 Feb 2017 13:22

Here is an AT SLT96. It's not as well-polished as others I've shown, and is a bit asymmetrical in contact areas. I don't remember how much time is on this one, but it's probably <100 hours. The contact area is 0.7 x 1.3 mils on left, 0.5 x 0.9 mils on the right. By left I mean "inner" contact, toward spindle, as record direction is top to bottom in all the photos I'm taking.

http://i943.photobucket.com/albums/ad27 ... 96_L_A.jpg

http://i943.photobucket.com/albums/ad27 ... 96_R_A.jpg


I can't seem to edit my last post about the AT231LP, so I'll say here that its contacts measure 0.2 x 0.9 mil left, 0.4 x 1.0 mil right, while the Andante P76 measures 0.06 x 1.4 mil on both sides.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 04 Feb 2017 16:22

OK, last one for a while as I need to convert system back for doing some 3D coin renderings...

Here is a beautiful stylus, the Stanton 747S. This one is a "stereohedron", and it has a unique shape with a flat initial edge with widening contact toward the back. The contacts measure 0.35 x 1.3 mils on left, and 0.30 x 1.2 mils on the right. Very impressive, and superb sounding as well:

http://i943.photobucket.com/albums/ad27 ... 7S_L_X.jpg

http://i943.photobucket.com/albums/ad27 ... 7S_R_X.jpg

Laila1
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Re: Stylus Evaluation Imaging

Post by Laila1 » 04 Feb 2017 23:46

Hi ray, I can not see your beautiful pictures in your latest post . . . I run Firefox,
Is it only me that can not see them . . . ?

/ Lars

aj1969
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Re: Stylus Evaluation Imaging

Post by aj1969 » 06 Feb 2017 17:03

I can see them and there superb Ray does it again

Laila1
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Re: Stylus Evaluation Imaging

Post by Laila1 » 06 Feb 2017 17:11

Laila1 wrote:Hi ray, I can not see your beautiful pictures in your latest post . . . I run Firefox,
Is it only me that can not see them . . . ?

/ Lars
Edit Now I can see them, just superb!

/ Lars


Delta667
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Re: Stylus Evaluation Imaging

Post by Delta667 » 09 Feb 2017 05:04

ray_parkhurst, Hi ))
With great pleasure to review your photos. Bravo !

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 10 Feb 2017 16:38

jdjohn wrote:Simply amazing shots! Makes me not want to post any of my own :( Maybe I can send my styli to Ray for a photo session :D
I hadn't considered offering this as a service but I'd certainly be willing. I would want to post any interesting styli or results (wear patterns, etc) on this forum.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 10 Feb 2017 16:46

Delta667 wrote:ray_parkhurst, Hi ))
With great pleasure to review your photos. Bravo !
Thanks D! I think this new technique gives a very good indication of the actual contact surfaces of both sides of the stylus, assuming the cartridge is mounted square to the record surface.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 13 Feb 2017 04:40

Here is my Shure V15LT. I originally purchased the V15LT body without stylus, and then picked up a stylus that was sold as NOS. It looks clean under 200x magnification, and sounds wonderful, and has been in rotation for quite some time. The pics below show a bit of wear, and I have only about 30-50 hours on it myself. After more accurately calibrating my magnification, I determined that the contact is 0.22mil (at the widest) by 1.4mil. I think the contact spec for the VN45LT is 0.15mil x 1.5mil, so it seems the wear is minimal. I have another VN45LT I will image for comparison, but for now I am pretty happy with the results...good symmetry, nice polishing, and a unique contact shape:

http://i943.photobucket.com/albums/ad27 ... _1L_X2.jpg

http://i943.photobucket.com/albums/ad27 ... _1R_X2.jpg

It's interesting that the contact is a "teardrop" with the widest part at the deepest portion of the groove. This is opposite of some others shown earlier, where the contact narrows as it goes deeper.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 13 Feb 2017 17:07

In taking these images, I realize now that the side views, while excellent for showing the shape and surface finish of the contact, don't give the whole story of how the stylus contacts the groove. An important aspect is what I will call "span at first contact" (SFC). If the SFC is very narrow, then first contact will be very deep into the groove. Look at the well-worn M99E I posted at beginning of this thread. It was so over-used that the contacts wore to a chisel point (SFC~0), resulting in the tip of the stylus dragging on the bottom of an unmodulated groove. The wider the SFC, the higher in the groove the stylus will sit. As the stylus wears, SFC will narrow, and the tip will move farther down into the groove. I can evaluate this characteristic using the top-down method, but I suppose a straight-on view would also work. Some sort of graphic would need to be imposed on the image to simulate the groove. This would be the most logical way to do the imaging, and I may give it a try, but will certainly try again with the top-down approach.

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Re: Stylus Evaluation Imaging

Post by ripblade » 13 Feb 2017 19:29

Ray, your last images showing the 'teardrop' wear pattern is fairly typical of what I see using the traditional "Shure" method. Below is a Glider H2 FG stylus with an unknown number of hours (bought used...I'm guessing a few hundred at least) which amply illustrates what I mean.

I'm going to be trying this shortly...still collecting tips and taking notes, but first and foremost I need to improve the lighting in my setup.

Keep them pictures coming! :D
Benz Glider H2- 50x.jpg
(32.73 KiB) Downloaded 496 times

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