Can I change a Coti's speed by swapping Slurry Stones??

My experience with spending a lot of time testing different slurry stones (all coticule or BBW) is as follows:

The type of coticule slurry stone used doesn't seem to have much effect on the way a coticule behaves. A slurry stone from a "typically" fast layer didn't really change a relatively slow coticule's performance, and the inverse is also true. This is what I've seen, and it's definitely counter-intuitive.

Regarding BBW slurry, it seems to help "bridge the gap" of keenness from the slurry stage of coticule use and finishing on water only.

Sham's video of the different slurry stones used on a Japanese stone is really cool. In fact, it's one of my favorite videos. However, what he is doing there, essentially has the same effect of effectual slurry diluting/management on a coticule. I have not tried using totally different types of slurry stones like his video, but it would make for an interesting exercise.

To answer espz's question: I would finish on water only after the BBW slurry.

Quote:

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Originally Posted by ezpz

agreed.. the coticule can usualy do it faster, but the bbw will produce a better bevel (keener).

once you've reached sharpness with BBW, what makes more sense: diluting bbw slurry, finishing with bbw + water, or moving to coticule with water?

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I read a post by Bart a long time ago that BBW + water tends not to improve the edge and can actually dull it-- he advises moving from BBW + Slurry to Coticule + Water.

When I use my combo hone, I start with BBW with moderate slurry and then dillute it as I go, but not to the point of water only.

Chief

Quote:

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Originally Posted by BHChieftain

I read a post by Bart a long time ago that BBW + water tends not to improve the edge and can actually dull it-- he advises moving from BBW + Slurry to Coticule + Water.

When I use my combo hone, I start with BBW with moderate slurry and then dillute it as I go, but not to the point of water only.

Chief

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I wouldn't use the BBW with just water, it does nothing to improve the edge from what I've seen. If it does then it's going to take a zillion laps to do so.

Well gang... I've got some interesting results.

I grabbed an older Revisor and set about setting a bevel using the SS that came with my Coti. It took forever, like it always does, and the slurry never really turned dark, indicating that very little metal was removed. I had to refresh the slurry three times because it simply dried out before I called the bevel set.

Then I used a different slurry stone, one that came from a vintage dished combination Coti. The hone was cracked in half, so each half became a SS. I used one of them on the same Coti to set a new bevel on the same Revisor. I didnt need to refresh the slurry at all. It turned dark and removed metal much quicker than slurry produced by the original stone.

My findings indicate that the slurry stone can impact the speed of the Coti.

i have many slurry stones. it sounds mad but i have my favourite slurry stone, i don't no why, i just stick with regular one. it just seems to work with coticules. i never noticed any speed differance with differant coticule slurry stones. i have 5 coticules ranging from rapid to very moderate to a little slower , so i have a good range. i do get to use them all .