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Shapton Glass Stones. What's up with the 8K?

Sat Jul 20, 2013 6:47 pm

Dear Mark, just got the shapton glass stone kit. Love all the stones with the exception of the 8k.

Getting a nice polish with the 4k stone and then the 8k actually scratches up the polish I just created. Thought there was a little burr on either edge of the stone and worked that off but the 8k stone just ruins the 4k polish. Am I doing something wrong or what?

Michael

Re: Shapton Glass Stones. What's up with the 8K?

Sat Jul 20, 2013 6:53 pm

I need more information about exactly what you are doing, how you are prepping the stones before sharpening and what kind of technique you use when you sharpen?

When you say the 8K scratches up the polish, can you show us by chance? You can put a loup over your camera lense to magnify the shot so we can see the edge.

Here are a few things that come to mind. I'm sure others can add a few questions.

Are you rounding the edges of the stones before you sharpen on them?
How are you flattening the stones?
Are you using the same exact motion when you sharpen on each stone?
How are you judging the edge finish? Microscope or Loupe or just looking at it?

Re: Shapton Glass Stones. What's up with the 8K?

Sat Jul 20, 2013 11:56 pm

I will second what Mark said. How are you prepping the stone before sharpening with it, and have you rounded the edges yet?

If you don't own a diamond plate, you can simply take your coarsest grit stone and knock the edges down on the 8k. That should solve your problem.

Re: Shapton Glass Stones. What's up with the 8K?

Sun Jul 21, 2013 6:29 am

I too have experienced this.....

It boiled down to loading of the 8k stone.

If the stone is not kept free of loaded metal schwarf, then the small metal particles actually scratch & destroy the previous finish.

In fact, the 8k GS gives a superb near perfect mirror finish.

As a parting shot ensure to use very light strokes with plenty of water & add a dash of liquid soap to the water.

:)

Re: Shapton Glass Stones. What's up with the 8K?

Mon Jul 22, 2013 10:19 am

Just lap the stone. This sometimes happens with stones where the odd bit of swarf - eg a removed burr or wire gets embedded into the stone. This is not specific to glassstones and can happen to many stones. It can happen to strops too. And Mark's comment on sharp stone edges is another cause.

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Ken
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