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 Post subject: Where's the scratches? 640k finish
PostPosted: Thu Mar 06, 2014 8:49 am 
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Where's the scratches? This is a new use for my compounds - gem polishing! The brown stone is Topaz 0.5 carats, and the green stone is Cristinite 9.45 carats. The individual facets have been polished with a combination of 0.1 micron CBN (160,000 grit) followed by 0.025 micron Polycrystalline diamond (624,000) grit. No evidence of scratches! Closeup pictures taken with a Canon 1-5x macro lens of individual facets inside a light tent. Some of the matte finish is the reflection of the light tent on individual facets.

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Ken



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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Thu Mar 06, 2014 11:06 am 

Joined: Tue Jul 24, 2012 1:28 pm
Posts: 459
Now that is cool Ken, geebus, those are absolutely stunning.
Made me think of something, I have a Rolex that was handed down to me and the crystal has several scratches, I bet I could remove those scratches with the products you used for the crystals.


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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Thu Mar 06, 2014 5:38 pm 
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Possibly so. I'd try something cheaper than an heirloom Rolex first :) I've been thinking of doing my eyeglasses :) For grinding lenses a softer abrasive - cerium oxide is used FYI.

FWIW I took those shots without a tripod :) With a tripod, I could have gotten a bit more magnification.

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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Thu Mar 06, 2014 5:40 pm 

Joined: Fri Feb 07, 2014 4:52 pm
Posts: 140
Thanks for sharing this kind of stuff. Really cool to get a "deep" look.


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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Fri Mar 07, 2014 7:46 am 
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Here's a knife edge done by a customer of mine also using a final finish using 0.025 poly, the same final finish used on these gemstones. This was done on a Kangaroo strop on an EdgePro.

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0.025 poly:

http://www.chefknivestogo.com/25namepodisp.html

Kangaroo strops:

http://www.chefknivestogo.com/kangaroostrops.html

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Ken



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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Fri Mar 07, 2014 5:09 pm 
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Joined: Tue Oct 23, 2012 1:14 am
Posts: 521
Location: San Ramon Ca.
Mighty pretty results!



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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Fri Mar 07, 2014 6:05 pm 

Joined: Thu Jan 02, 2014 12:42 am
Posts: 19
Ken that knife edge is beautiful....


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 Post subject: Re: Where's the scratches? 640k finish
PostPosted: Fri Mar 07, 2014 8:43 pm 

Joined: Fri Feb 07, 2014 4:52 pm
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Love seeing these Macros, keep em coming :)

ken123 wrote: For grinding lenses a softer abrasive - cerium oxide is used FYI


A fountain of information, thanks Ken!

off to google


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