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 Post subject: New Toys!
PostPosted: Thu Dec 01, 2016 8:37 pm 
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Joined: Mon May 28, 2012 6:29 pm
Posts: 1702
Some years ago I had a cool little USB microscope that allowed me to get a whole new perspective for the sharpened edge. It was short lived though as it landed in a bucket of water while turned on (if falling into water was not bad enough) and to no real surprise never worked again.

I had a recent discussion that sparked my interest in micrographs again so I hopped on flea bay and ordered a cheap USB Microscope. It said 1000x but in reality it's probably closer to 300x, still enough to get a good up close look at the sharpened edge. I was hoping for better picture quality but I will just wait until I buy a real microscope :ugeek:

For now, I will use it to compare scratch patterns and see how my current edge is looking. Here are a few photos I took testing it out.

Image


Image

And my Spyderco Delica in Hap40, sharpened with the SG500 and SG2000

Image


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 Post subject: Re: New Toys!
PostPosted: Thu Dec 01, 2016 9:56 pm 

Joined: Fri May 30, 2014 5:34 pm
Posts: 784
Id like to get some sort of microscope to look at my edges.


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 Post subject: Re: New Toys!
PostPosted: Fri Dec 02, 2016 11:42 am 
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Joined: Mon May 28, 2012 6:29 pm
Posts: 1702
They are fairly cheap but I would suggest looking for an HD scope, the images will be much clearer. It can be a great teaching tool too.


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 Post subject: Re: New Toys!
PostPosted: Fri Dec 02, 2016 12:35 pm 

Joined: Wed Apr 02, 2014 6:52 pm
Posts: 2338
cutu wrote:Id like to get some sort of microscope to look at my edges.

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That is a neat toy for sure.

The "real" quality ones are expensive and you need a precise stand to hold the knife steady esp. at higher magnification. Even then, focusing is a challenge as the knife is not flat so just some of the field-of-view (FOV) is focused and that assuming the glass has no distortion. Add to that the challenges of photographing it and getting the light right and color correct and polarizing to reduce reflection, etc. Ken details some of the challenges in this post: post137574.html#p137574

Practically speaking, a quality 7-10x loupe is really all you need to use while sharpening. There really is no substitute for good glass either. Beyond 10x it is difficult to hold steady and the FOV is reduced.

IF you are curious a small pocket microscope @60x will give you a very closeup view. I have one and for $14 is worth getting (recommended) but using a loupe is better suited to sharpening IMO.

The image below is a 15x view of an edge taken through a loupe with iPhone 5s.
What does the image tell you?
The image is of a Gassan blue #2 steel edge sharpened to a 15k Shapton then finished on a Hakka natural stone. To the naked eye the edge is a shiny mirror reflected in the sun with enough tooth to bite tomatoes or peppers skins without sliding, a very fine edge indeed, the complex edge off a natural (compare with the previous Shapton images).

The wonders of a small world...

Image


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 Post subject: Re: New Toys!
PostPosted: Fri Dec 02, 2016 1:16 pm 
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Joined: Mon May 28, 2012 6:29 pm
Posts: 1702
I use a 30x in front of my IPhone often, works very well but the microscope goes way further... helps to know what you are looking for/at too, otherwise it's just another micrograph.


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 Post subject: Re: New Toys!
PostPosted: Wed Dec 14, 2016 4:48 pm 
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Joined: Mon Oct 29, 2012 6:20 pm
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Yep...these are great to have. Many years ago I used a 300x for quite a while to reach the sharpening method I like to use. But I do believe in objectivity when assessing things. The scope helped tremendously when proving what was what, when x was applied to y in z way. I haven't used it for said use in quite some time however...

Good topic tho! Something that really anyone looking into sharpening details should go through. A defacto microscope would even be better.



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 Post subject: Re: New Toys!
PostPosted: Thu Dec 15, 2016 8:48 am 
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Joined: Mon May 28, 2012 6:29 pm
Posts: 1702
I have a car build/motor swap that has been my life for the past two months but once that's complete (hopefully this weekend) I'm going to start making series of threads with different stones sets displaying their scratch pattern from coarse to fine. Hopefully it will help display some of the differences in stones and how it makes some more desirable than others. Maybe-maybe not but it should at least be fun to look at.


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