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Difficulties with a Shapton 1000 Glass

Sat Sep 28, 2013 8:04 pm

I am wondering if others have found this stone to be less than satisfactory. It loads up very quickly; seems uneven in the grit density across the stone; and, also seems to have particulate of some kind embedded in it, despite rigorous segregation from other stones. I use Chosera, Imanishi, and King 1000s and none seem to pose the difficulties of the Shapton Glass. [I also use the Shapton Pro 320 for thinning/reshaping and it too gives great results].
Do I have a lemon or are these problems that others have encountered?

Re: Difficulties with a Shapton 1000 Glass

Sun Sep 29, 2013 10:51 am

I've personally never had a problem of consistency with my glass stones, but I am not ruling out that you may have one. So, just a few questions so we can better help:

Do you use a diamond lapping plate? If so, how much have you lapped the stone?

Are you able to take a picture of the stone for us to see?

What kind of stone progression are you using when the 1k Glass is being implemented?

I will say, sometimes Glass stones do load a little bit, but this mostly happens when you don't have a slurry raised first or if you didn't clean it properly after a previous sharpening. The trick to keeping Glass stones cutting like lightning is to have a little bit of abrasive worked up first. I find that while they do cut steel faster than just about anything, you do have to keep a diamond plate on hand. You don't always have to build a slurry, but at least keeping the stone clean with a little bit of scrubbing goes a very long ways.

The 320 pro stone you have is a bit muddier compared to the Glass stones and will cut faster initially, as well as the 1k pro, but the 320 and 1k Glass with a slurry raised first are going to be faster, especially on high alloy steels.

Anyhow, I think a picture of the stone would help best. If everything turns out to be okay and you still don't like it then the 1k pro might be more your speed. The Pros and Glass do have differences.

Re: Difficulties with a Shapton 1000 Glass

Mon Sep 30, 2013 6:58 am

I would thoroughly lap the stone. I have been using the Shapton GS for many years and including the 1k GS, this has not been a problem. You may have embedded some swarf or even a broken off burr or wire edge into the stone (sometimes referred to as galling). Give it a good looking over with a loupe too.


Re: Difficulties with a Shapton 1000 Glass

Sat Oct 05, 2013 7:31 pm

Thanks for the advice, gents. I have lapped the stone on both a diamond plate and a Naniwa flattening stone until it is dead flat and all trace of metal is removed. Regardless, the stone shows several inclusions. Under a 10x loupe, several appear to have a dark dot at the center with dark grey around it. Some can be felt with the fingertips; others not. The fingertips also reveal what I can only describe as variable porosity across the surface, even in areas without inclusions.
Please understand that NONE of my other stones show any of these issues, from a Shapton 320 up to a Snow White 8K. I will try in the next couple of days to take a couple of photos of sufficient resolution as to permit viewing of the inclusions.
Ken, I'm loving the Meara for final finish - works like a dream.
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