Has anyone here ever used abrasive powders in their sharpening? Your thoughts?

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Miyamoto Musashi

Miyamoto Musashi

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Stuff like Kongo sand, Emery 40 etc.

I’ve heard mixed things about kongo sand and wanted to consult the opinions of any people here who have used it before.

Thanks!
 
Diamond powder + mineral oil on a strop. I first put oil on the strop then drop some powder on it (less expensive than diamond spray). I finish my D2 and ZDP knifes on it. Works great.
 
I use loose SiC often while thinning on course stones, it works for helping speed things up and then it also crushes down and softens up the scratch marks/leaves a decent base "polish". I'd look around for a lapidary shop near you, I don't think it's necessary to pay a premium for naniwa branded loose SiC.
 
deltaplex said:
I use loose SiC often while thinning on course stones, it works for helping speed things up and then it also crushes down and softens up the scratch marks/leaves a decent base "polish". I'd look around for a lapidary shop near you, I don't think it's necessary to pay a premium for naniwa branded loose SiC.
Click to expand...
Do you notice more dishing on the stone?
 
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deltaplex said:
It's funny that you ask this, because yes there is more dishing of the stones with it, no question. It's the only way I've found that actually can dish a Crystolon or India (to a lesser extent) through my "normal" use.
Click to expand...
I have used SiC powder to flatten my whetstones, this is the reason to ask it.
 
Last edited:
OP asked about sharpening. What powder grits are used on which grit stones? I have some 240 Alum Oxide and am wondering iwhat stones it would most likely be used with for sharpening. Also, what are the differences and best applications for AlOx vs SiC?
 
Last edited:
1315 said:
OP asked about sharpening. What grits powder grits are used on which grit stones? I have some 240 Alum Oxide and am wondering iwhat stones it would most likely be used with for sharpening. Also, what are the differences and best applications for AlOx vs SiC?
Click to expand...
They're pretty much interchangeable, but AlOx is harder than SiC. 240 grit is probably too fine for initial stone flattening, but should be fine for most stones from a lapping or edge chamfering standpoint.
 
deltaplex said:
They're pretty much interchangeable, but AlOx is harder than SiC. 240 grit is probably too fine for initial stone flattening, but should be fine for most stones from a lapping or edge chamfering standpoint.
Click to expand...
I believe you have that reversed...silicon carbide is harder than aluminum oxide. Aluminum oxide is, however, more durable.
 
Not flattening. I thought you could use powders for instant slurry. Am i wrong on that? I know i can make sorry from the stone itself.
Note: i got a columbia gorge stoneworks diamond stone with 10 micron grit, which equates to a 1200-1400 grit stone. Maker days you have to prep the surface, and recommended 240 alox for that. So, it's it possible to add the 240 alox on say, my naniwa pro 600 for edge sharpening only? Is there any benefit or other use for my 240 powder, or just for refreshing the diamond surface on the cgsw?
(I don't polish or thin yet, just for sharpening)
 
M1k3 said:
Amazon.
https://a.co/d/50x7ZOp
Click to expand...

I recognized that vendor when I saw it and went back and looked and it's one that I was going to (will soon) buy some 60 grit SiC powder for flattening extra coarse stones. Difference being that I found him on eBay and same product cheaper and even at 1/2 the price if you go 2lbs w/ free 2-4 day shipping. I've never used it but my understanding is that 2 lbs would last 16 lifetimes :)

MJR Tumblers Storefront
mjrtumblers on eBay

1 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use
1 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use | eBay
$12.65

2 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use
2 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use | eBay
$15.65

They have a bunch of grit options/combination packages which would be beneficial if you wanted multiple grits for multiple stones and if I remember correctly if you reach out to them they will put together whatever you want. I think they have both Sic and Aluminum Oxide

I have not bought anything from them (yet) but thought I'd toss this out there as another purchase option. They seem to have good feedback and are a "Top Rated Plus" vendor whatever that means.

HTH = Mike
 
deltaplex said:
They're pretty much interchangeable, but AlOx is harder than SiC. 240 grit is probably too fine for initial stone flattening, but should be fine for most stones from a lapping or edge chamfering standpoint.
Click to expand...

PolishAvenger said:
I believe you have that reversed...silicon carbide is harder than aluminum oxide. Aluminum oxide is, however, more durable.
Click to expand...
SiC is harder than AlOx.
AlOx has sharper edges than SiC though, making AlOx faster cutting.
SiC is more likely to fracture, AlOx is more likely to dull.
 
mike59 said:
I recognized that vendor when I saw it and went back and looked and it's one that I was going to (will soon) buy some 60 grit SiC powder for flattening extra coarse stones. Difference being that I found him on eBay and same product cheaper and even at 1/2 the price if you go 2lbs w/ free 2-4 day shipping. I've never used it but my understanding is that 2 lbs would last 16 lifetimes :)

MJR Tumblers Storefront
mjrtumblers on eBay

1 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use
1 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use | eBay
$12.65

2 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use
2 lb of 36 Grit Extra Coarse Rock Tumbling Silicon Carbide for Lapidary use | eBay
$15.65

They have a bunch of grit options/combination packages which would be beneficial if you wanted multiple grits for multiple stones and if I remember correctly if you reach out to them they will put together whatever you want. I think they have both Sic and Aluminum Oxide

I have not bought anything from them (yet) but thought I'd toss this out there as another purchase option. They seem to have good feedback and are a "Top Rated Plus" vendor whatever that means.

HTH = Mike
Click to expand...
I've bought from this vendor; no complaints.
 
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