Thanks Phil,
Very informative and helpful. I appreciate your sharing this info, even though it may wind up costing me a bunch more now. I see where the Chosera stones are now listed on the website among the top selling accessories.

By the way, you mention that you go back to the 2/3 K Chosera Stones, ( presume before finishing them with the 5K/10K C Stones.

Could you do just as well after going through the diamond progression and then the ceramic progression with the added strokes and then to the 5/10 K C Stones or even just the 10 K C Stone since the micro fine ceramic is pretty close to what the 10 K grit is supposed to be? Or do you really need to go back to the 3 K C Stone and then move forward from there. Also, I guess if you do that why go all the way through the diamonds to ceramics and then to the Choseras. Why not just go from 1000 diamond to 3/4 K Chosera then 5/10 K?

Love the feedback available here. Great job.

Scott Sherman wrote:


Interesting that you ask. "usually" after going throught the diamond progression I .. "go back" the the 400 Choseras. They are listed as being much more coarse than the 600 diamonds. Maybe they are, but they "seem" to remove a good bit of tyhe diamond scratches.. after the 1000 grit Diamonds... and brighten up the edge considerably.

I then go to the 600, then 800 then 1000 choseras.. The 1000 are still more coarse then the 1000 diamonds.
After the 1K Choseras we are getting a real nice reflective finish. After the 2K/3K (Tom says this is dependant on the particular blade... being OCD I use them both) It is definitely more reflective at that point, than I got going through the last three knives ..in different steels, than the result using the 4 stones progression with the ceramics from WEPS after the diamonds. The Ceramics "cut" the Choseras.. cut AND polish.

I think you could get there with the 5K/10K Choseras after the ceramics.. It would just take lots more strokes...
As Curtis said, you could get there with strops and the WEPS pastes... and maybe we could... But, again, with lots more strokes.

More in a bit.. need to walk the dogs!

Phil

What is the benefit of using 100-1000 diamond progression first? I heard that 400 Choseras work very fast, so why you don't start with them?

?? Cutting down on stone wear maybe?

LukasPop wrote:


Speed. The diamonds cut much faster. By their nature, they tend to cut deeper as well. These (relatively) big honkin troughs are what I want to get out with the Choseras. While the 400 Choseras are pretty fast, they can't touch the 100/200 diamonds for speed.
I think I have seen some Naniwa SuperStones in 120 and 220. These are something I would like to try some day. They could replace the diamonds for all but major repairs I think.

Phil

So.... after fnishing up the Damascus mule I deciced to go back to the other Mule with the BCTS-B75P steel and see what some additional stropping would do for it. First, this steel is very close in chemical make up to BG 42 which was used for awhile in custom knives. The biggest use for BG42 was in aerospace for making ball bearings. It can be left very hard, I believe up to Rc 66 or better and polishes very well. The BCTS-B75P is Carpenter Steel's powder metalurgy version of the BG42. In the Mule it is supposedly hardened to around Rc 63. It should polish even better than the BG42 as the powder technology is designed to produce a finer grain with more uniform distribution of its carbides and the Vanadium which differentiates it.

If you remember from a previous post I had reprofiled this blade with the 100/200 diamonds and worked on it through the 1000 grit diamonds followed by the four grades of WEPS Ceramics. I then did a few strokes per side with 6 micron DMT paste on leather. The finish, while somewhat reflective, still had a lot of visible very fine scratches. Keep in mind that I went to about 200 strokes with each set of the ceramics and alternated every 50 with edge leading and edge trailing strokes. I really wanted to get results that would allow me to use this as my standard progression. It is fairly fast and there is little fiddling with angles. I think for a utility blade or a customer who did not want to pay for the ultimate polish, it could fit that bill nicely.

This time I wanted to follow-up on something that Curtis said. In essence I think I heard that he thought that the Choseras could be replaced by the WEPS pastes to get to the same place. I wanted to see how that would work for me. So I went back to the 14/10 WEPS paste on leather. I hoped to start at this level to get rid of some of the Ceramic scrathces relatively quickly, and I did. I used about 200 strokes at each grit. BTW, I changed my angle from 18 degrees on the main bevel to 17.25 degrees. I then went to 6/3 micron, then 1/0.5 on leather, then 0.125 CBN and 0.1 Diamond on Kangaroo then 0.050 and 0.025 micron dimond on NanoCloth for, again, about 200 strokes per side, per grit.

Bottom line, I had a very sharp, litterally hair whittling edge and a quite shiny bevel. I still had far more fine scratches visible than on the blade done with the Chosera progression to 10K, the 12K superstone, and then from 1 micron down to 0.025 micron strops as above... and the edge is just not quite as bright. Of course this is an entielr different steel than the VG10. I have a second mule in the BCTS-B75P, one day I will have to go back and do it the way I did the VG10 so I can directly compare.

I will see If I can get some pics that will capture what I am talking about... it was 11:30 by the time I finished up last night...and I get up before 5 AM. The pics will have to wait

I hope this does soembody some good!

Phil

PhilipPasteur wrote:


It definitely does, Phil. Very good reading. Thanks for posting it!

Ken

Thanks very much for taking time to experiment and report your observations. It is very helpful and appreciated. It certainly shortens the learning curve and at least for some may save money so they don't have to buy stones or accessories they won't need or allows some to add stones that they may not have been aware of or get results that otherwise might have been unobtainable.

This goes to all who take the time to experiment and share. Or just share their knowledge or experience.

Phil,

Again, great write up and lots of good info. I can't wait to get my Chosera's.

Andrew,
Which Chosera's did you buy?