Has anyone tried the PDT silver stones? (Hybrid mettalic-vitrified bond)

[ChasingSharpness]

Hi,

I was wondering if anyone has tried or has any information about the Poltava premium silver range of stones? These are supposed to have a hybrid metallic-vitrified bond. I can't seem to find any reviews or information at all about them anywhere.

 

[abrasivetools]

I work in this industry
there's only reason to make hybrid stone - to increase tooling life
and really working hybrid bond is metal-resin.
combination of few recipes. depending on grain size results in combined bond sharpening stones
PDTools makes good metal bond stones, and it would be enough, but marketing people started playing with gold, silver, expert, premium and other stuff, instead of selling good old CBN SHARPENING STONES, RESIN BOND, 100%, 200%, instead of expert, expert lite, expert pro....

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[Spitfire34555]

I work in this industry
there's only reason to make hybrid stone - to increase tooling life
and really working hybrid bond is metal-resin.
combination of few recipes. depending on grain size results in combined bond sharpening stones
PDTools makes good metal bond stones, and it would be enough, but marketing people started playing with gold, silver, expert, premium and other stuff, instead of selling good old CBN SHARPENING STONES, RESIN BOND, 100%, 200%, instead of expert, expert lite, expert pro....

I work in this industry
there's only reason to make hybrid stone - to increase tooling life
and really working hybrid bond is metal-resin.
combination of few recipes. depending on grain size results in combined bond sharpening stones
PDTools makes good metal bond stones, and it would be enough, but marketing people started playing with gold, silver, expert, premium and other stuff, instead of selling good old CBN SHARPENING STONES, RESIN BOND, 100%, 200%, instead of expert, expert lite, expert pro....

​

I can’t tell if you’re for or against poltava stones… which is fine with me either way. You definitely seem to know what you’re talking about. So what do you recommend? I have more than a few PDT CBN products, and have had good experience. But at the same time I haven’t had a whole lot of experience with others. I’d love your feedback. Especially for the fine grits.

 

[abrasivetools]

There are 2 factories in Poltava: PDTools and PPDT, they make private brands for many sellers.
I do not recommend specific seller, but you may find these products on Google or eBay
Below are 2 sample CBN sets, which illustrate my vision:

Recommended set #1
CBN stone 150x25x3, metal bond, grain size 200/160 - forming the cutting edge
CBN stone 150x25x3, metal bond, grain size 100/80 - rough sharpening
CBN stone 150x25x3, metal bond, grain size 40/28 - fine sharpening
CBN stone 150x25x7x3 combined bond, grain size 20/14 - fine lapping
CBN stone 150x25x7x3 combined bond, grain size 10/7 - the finest finishing
CBN stone 150x25x7x3 combined bond, grain size 5/3 - polishing
CBN stone 150x25x7x3 combined bond, grain size 2/1 - fine polishing.
CBN stone 150x25x7x3, combined bond, grain size 0.5 / 0 - the finest polishing.

Recommended set #2
CBN stone 150x25x3, metal bond, grain size 100/80 - rough sharpening
CBN stone 150x25x3, metal bond, grain size 40/28 - fine sharpening
CBN stone 150x25x7x3, combined bond, grain size 20/14 - fine lapping
CBN stone 150x25x7x3, combined bond, grain size 10/7 - the finest finishing

As you see, I recommend metal bond (by PDTools) for coarse grain sizes, and combined bond (by PPDT) for finer grains.
Combined bonds: resin bond BP50 for polishing and metal-resin bond BP05 for grinding.

I do not like game by PDTools, when they started offering more bonds in the same niche (wear resistant bonds): Premium, Silver... I do not like renaming of old good bonds into marketing stuff: resin bond to Expert, etc.
But they still are the best in metal bonds (Premium line) and they still are developing really new products. Comparing to Venev's OSB (B2-01 without SiC) and TSProof's Alpha (volcanic bond for electro corundum). Ha-ha, my prejudice may be "explained": both latter companies are from enemy country.

Pay attention:
1. there's Lite version of Poltava stones, with 1.5 mm thick abrasive layer, comparing to regular one, 3 mm. Check passport for weight of abrasive (around 50 cts for 25 mm stone, 100%) and for dimensions, last digits 1.5 or 3
2. there are sharpening stones, called Premium Ukrainian stones. In fact they are "Low cost, but premium quality solution for novice sharpener. Blank is thinner, edges are not beveled, modest packaging, stones need preparation".