Thread: Stropping with diamond paste after 4k?

Are you talking 5.0, .05 or .50um?

5.0um is about 3-4K, .50 is about 30k and .5 is crazy small.

Ken Schwartz is or was making a 0.015um diamond spray, rated or projected at. 1.2 million K grit.

8K equivalent would be about 2.0um.

Yes, you can strop on diamond or other aggressive paste or strays, and as said diamond can be aggressive. Additionally, not all diamond sprays and paste are the same in quality and results, Grit size, caret count and suspension all play a large part, in Nano grit performance.

Convexing a bevel is not a bad thing. Rounding an edge is from improper stropping.

From a 4k edge, strop/polish on a good metal polish to remove all visible stria, (Mothers/Maas, 100+ laps), then joint and re set the edge with the 4k or your highest grit stone with, the lightest amount of strokes possible.
Then polish on CBN .50 for a keen comfortable edge, (50+ laps). Diamonds will require experimentation.

Here is a good chart for CBN.

Available CBN Abrasive Sizes from Ken Schwartz
Abrasive size in microns (μ) Grit Size (JNS)
80.0 #180
45.0 #320
30.0 #500
15.0 #1,000
4.0 #4,000
2.0 #8,000
1.5 (1 1/2) #12,000
1.0 #16,000
0.75 (3/4) #24,000
0.50 (1/2) #30,000
0.25 (1/4) #60,000
0.125 (1/8) #120,000
0.10 (1/10) #160,000