Does this stone could be fixed or It's ruined ?

lutejones

lutejones

Joined
Mar 15, 2007
Messages
733
Hey guys,
This stone is my first one, It's about 15 years old and It was being used in a regular basis this days with the simple carbon steel knives. It seems to be Aluminium oxide, but I'm not sure, It works great with water and with oil too(I tryed and then boiled it) even dry but It loads quickly. I calculate the grits about 200 the white and around 400 the orange, close to an India stone.
The stone was dished(white side/coarse) and had some metal swarf but was still cutting very well. So I decided to lap it with a DMT 6" interrupted surface coarse stone and the result is... not very good. It's much much smoother and the knives seems to slide on the surface, It's like glazed even though It still loads with swarf, so It is cutting a minimum.
some pics to help visualize the issue:

This is how the surface of the stone is supposed to look



and this is the surface after lapping process



Do you guys think It can be fixed? I was thinking maybe with loose grit?
It's a pity because it has some sentimental value.

Thanks
Mateo
 
A concrete sidewalk and a bucket of water.

Rub in a figure "8" pattern until surface is refreshed.
 
knifenut1013 said:
A concrete sidewalk and a bucket of water.

Rub in a figure "8" pattern until surface is refreshed.
Click to expand...

Ok I'll try, thanks

What do you think was the problem?? Did the diamond broke the abrasive particles making the actual grit higher?? Or something else?
 
Last edited:
Probably just too fine of a abrasive.
 
lutejones said:
Ok I'll try, thanks

What do you think was the problem?? Did the diamond broke the abrasive particles making the actual grit higher?? Or something else?
Click to expand...

It could easily have "polished" the abrasive. I always try to include some form of loose abrasive when lapping vitreous stones. The sidewalk will probably break down a bit and supply enough loose grit to help with the lapping.
 
If it's lapped flat, it's fine.
The stone surface is not supposed to look like the edges. If you sharpened on the edges, they would look like the flats!
Scrub the stone with some Barkeeper's Friend scouring powder and use it.
 
Sand, no water, on concrete. Water will make a paste and slow down the lapping, sand will make it flat but still with texture.

After lapping rinse or wash if you like.
 
Thanks a lot guys,
I tried yesterday the concrete sidewalk thing and it worked perfectly, although the middle of the stone needs a little more work on the white side.



What a great place to hang around, full of knowledge and people willing to share it
Mateo
 
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