Stylus Evaluation Imaging

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

Post by ray_parkhurst » 28 Jan 2017 23:39

ripblade wrote:^ How many hours on that tip?
Zero. It's a brand new stylus I just got from JICO.

I measured the contact areas and they are:

Left: .19 x .39 mil
Right: .19 x .75 mil

I annotated the pic to indicate record play direction and to better point out the contact areas:

http://i943.photobucket.com/albums/ad27 ... 20lr_b.jpg

ripblade
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Re: Stylus Evaluation Imaging

Post by ripblade » 28 Jan 2017 23:54

If this is unused, then I presume these areas are polished at the factory?

ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 29 Jan 2017 00:27

ripblade wrote:If this is unused, then I presume these areas are polished at the factory?
Yes, I would assume so. Polishing ensures the stylus does not cause undue record wear during its break-in period. As the stylus wears, the contact areas get polished by the vinyl. I'm very curious to see how the contacts wear, and change in area.

edited to add:

Before I changed to the new imaging method, I shot this stylus with my original top-down side-illuminated method, but I saw asymmetry in the contact areas. I tried the new method in order to validate what I was seeing. Seems both methods give the same info, but in different ways.

http://i943.photobucket.com/albums/ad27 ... 10HE_A.jpg

MarkNC
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Re: Stylus Evaluation Imaging

Post by MarkNC » 29 Jan 2017 01:33

These photos are utterly marvelous, and any and all are most appreciated. It's fascinating seeing various styli so up close and personal!

ripblade
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Re: Stylus Evaluation Imaging

Post by ripblade » 29 Jan 2017 03:17

ray_parkhurst wrote:Before I changed to the new imaging method, I shot this stylus with my original top-down side-illuminated method, but I saw asymmetry in the contact areas.
The asymmetry is not only at the contact points...it looks as though the entire diamond chip is off center in relation to the mount.

Is the tip azimuth off when viewed from the front?

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 29 Jan 2017 14:11

ripblade wrote:Is the tip azimuth off when viewed from the front?
No, it is very straight. I checked it initially and saw no issue, then checked again after I saw the top-down asymmetry, but the diamond itself is perfectly aligned.

This stylus sounds wonderful. It is very similar to the original Shure, but I need more time with it. I plan to break it in before the NEO SAS/S.

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Re: Stylus Evaluation Imaging

Post by ripblade » 29 Jan 2017 17:13

I guess what we're seeing then are normal tolerances for what are incredibly exacting measurements. These magnifications make the errors seem huge but given Jico's reputation for quality these errors must be well within spec. In any event, a few plays will even out the contact points fairly quickly and the polish will be enough to ensure the vinyl isn't damaged in the process.

I've looked at many a stylus with my own m'scope, but the resolution is never near as revealing as these images despite the high magnifications. I can tell if a stylus is still good (or if it's even polished or not) by the size and shape of the contact patch but that's about it.

How many frames did you take to stack the last image?

ray_parkhurst
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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 29 Jan 2017 17:27

ripblade wrote:I guess what we're seeing then are normal tolerances for what are incredibly exacting measurements. These magnifications make the errors seem huge but given Jico's reputation for quality these errors must be well within spec. In any event, a few plays will even out the contact points fairly quickly and the polish will be enough to ensure the vinyl isn't damaged in the process.

I've looked at many a stylus with my own m'scope, but the resolution is never near as revealing as these images despite the high magnifications. I can tell if a stylus is still good (or if it's even polished or not) by the size and shape of the contact patch but that's about it.

How many frames did you take to stack the last image?
The straight-on shot took 36 frames, with a step size of around 12.5um. Each of the 45-deg images took 25 frames, with step size of around 4um.

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Re: Stylus Evaluation Imaging

Post by ripblade » 29 Jan 2017 17:48

ray_parkhurst wrote:The straight-on shot took 36 frames, with a step size of around 12.5um. Each of the 45-deg images took 25 frames, with step size of around 4um.
Thanks for that (sounds like a lot lol).

How long does it take to compile them into a single image?

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 29 Jan 2017 18:06

ripblade wrote: Thanks for that (sounds like a lot lol).

How long does it take to compile them into a single image?
I have a slow computer, so it takes 4-5 minutes.

Trio KD1033
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Re: Stylus Evaluation Imaging

Post by Trio KD1033 » 29 Jan 2017 21:57

Absolutely brilliant stuff Ray.

Andy

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 02 Feb 2017 04:30

Here is the Sumiko Andante P76 using the 45-degree technique. Reminder...the contact area is the dark area at the tip. In this case it's a line contact...

http://i943.photobucket.com/albums/ad27 ... %20P76.jpg

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 03 Feb 2017 04:26

The forum limited the width of the images so it was hard to see the very narrow line contact on the P76. Here are the L and R contacts separately...

http://i943.photobucket.com/albums/ad27 ... 76_L_A.jpg

http://i943.photobucket.com/albums/ad27 ... 76_R_A.jpg

wualta

Re: Stylus Evaluation Imaging

Post by wualta » 03 Feb 2017 05:08

Aw, cool!

aj1969
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Re: Stylus Evaluation Imaging

Post by aj1969 » 03 Feb 2017 12:01

Just breath taking pictures. beautiful Love the shape of the tip as well. Great job.

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