Recommendation? Am I choosing the right SiC powders to buy for my Venev Stones?

Murkr

Murkr

Joined
Jan 23, 2023
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Below are the stones I have purchased, when I'm ready to lap them, which Silicon Carbide powder do I use for each stone?
HAPSTONE START DIAMOND (100 grit) -- Use F60 SiC powder
Venev Orion (F240 grit) -- Use F120 SiC powder
Venev Orion (F400 grit) -- Use F220 SiC powder
Venev Orion (F1200 grit) -- Use F320 SiC powder

Does that look like the right SiC powder to use for each stone?
I pulled this info from gritomatic SiC product page, but I know different companies' stone grits are different values (IE: F1200= J4000grit).
I just want to verify what SiC grit you guys are using.

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While I use Sic powder a lot, to flatten and surface-condition Arkansas stones, washitas, metallic-bonded stones, and sintered ceramics, I have always been reluctant to use it on resin-bonded stones like the Venev. I use diamond plates instead.

My fear is that I will get grit embedded in the stone, and wind up with rogue scratches on the bevel. Whether that is a valid fear, I do not know.
 
U UncleBoots Since I havent bought anything for lapping yet I will also look into the diamond plates. Which ones do you use?
EDIT: wow those are expensive! I think they may be out of my price range for now haha.
 
I'd use the 120 on Venev's F240 and F400 and. 320 is good for the F1200.

I'm not familiar with "HAPSTONE START DIAMOND." Is that a resin bonded stone? If it's a plate you definitely don't want to lap it.
 
Murkr said:
U UncleBoots Since I havent bought anything for lapping yet I will also look into the diamond plates. Which ones do you use?
EDIT: wow those are expensive! I think they may be out of my price range for now haha.
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Good diamond plates are expensive, yes. But people say that the cheap Chinese ones are about as good for the purpose of lapping stones. I actually use some plates I've had for decades, that are completely worn out for the purpose of grinding metal, but still work great on stones.

I haven't priced the cheap Chinese diamond plates, but I think they are way way below Atoma/Ultrasharp pricing. But you do want a full plate, not those horrid things with holes in them that are filled with plastic.
 
Blade Lab said:
I really wouldn't use diamond plates to lap diamond bonded stones. The plates will die very quickly.
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Fair enough. I have done it only a couple of times. Mostly the synthetic nagura that came with my Naniwa diamond stone serves the need.
 
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