Poltava premium bronze, silver (metallic vitrified bond) and vitrified stones?

[ChasingSharpness]

Hi,

I was looking for some PDT mettalic bonded premium bronze stones (160-550-1500 grit) for my guided system. But I just noticed newly available PDT mettalic-vitrified bonded CBN stones (up to 1500 grit), as well as the vitrified stones (only up to 550 grit) were also released.

I was wondering if anyone has ever tried these hybrid vitrified and vitrified stones? In particular for the 160-1500 range? I can't find much in the way of reviews but i thought I would ask.

 

[Wowbagger]

Hi,

I was looking for some PDT mettalic bonded premium bronze stones (160-550-1500 grit) for my guided system. But I just noticed newly available PDT mettalic-vitrified bonded CBN stones (up to 1500 grit), as well as the vitrified stones (only up to 550 grit) were also released.

I was wondering if anyone has ever tried these hybrid vitrified and vitrified stones? In particular for the 160-1500 range? I can't find much in the way of reviews but i thought I would ask.

this probably won't help you but figured I'd chime in .
I have the :

Metallic Bonded CBN 6" x 1" x 0.125" Sharpening Stone with Aluminum Mounting for Edge Pro 15,000 grit​

Product Description​

Metallic CBN Sharpening Stones are used for sharpening knives using Hapstone and Edge Pro sharpeners. CBN (Cubic Boron Nitride) is the second-hardest material after diamond. CBN's qualities include its high levels of high hardness, strength, abrasion resistance, and thermal and chemical resistance. These characteristics exceed the values of synthetic diamonds and conventional abrasives such as silicon carbide and aluminum oxide. In particular, CBN's high thermal stability and chemical resistance make it suitable for sharpening in conditions where synthetic diamonds are not normally employed. CBN offers excellent performance in sharpening knives of any steel. Due to it's high resistance specs, CBN can be used dry without lubricant. This makes CBN the cleanest of the available sharpening stones. Metallic CBN stones utilize copper-tin alloy bonding for high endurance and low wearing rate. Meatllic CBN Stones consists of a 3 mm thick CBN-bearing metal plate mounted on a high-quality aluminum blank.

I was quite excited about this stone and it seems to be very well made but it seemed to just burnish rather than cut and I wound up with AWFUL , large , burs and then had to back up to previous more coarse stones to take the bur off and then this 15,000 made another bur rather than refine the edge .

I realize this is a crazy fine grit stone many / most people will have no use for but I LOVE polished edges and have tons of experience producing them and was SOOOOO surprised at how poorly this stone performed . I get tired of using my super fine stone with the round dimples in it (8,000 DMT ) and wanted a similar diamond stone with no stupid holes in it . . . oh well . . .

 

[abrasivetools]

Frist, forget about premium
Yes, they call stones so, but this is old good metal bond M2-01 (copper-tin). It performs well on coarse grain sizes, and worse on microns (below 50 microns=270/325) , just because this bond is hard plus it's difficult to distribute micron powders, which form agglomerates in bronze alloy.
Also they make stones 1.5 mm thick and call them Lite. Apparently, dealers asked for this product to compete on the market. Product passport contains 1.5 mm in dimensions, but may not contain magic word "Lite". Yes, Premium Lite
Recently they introduced few new bonds and call them hybrid; this is correct from technical point of view, but it's wrong for sharpeners, because for hand sharpening you need only one hybrid: resin bond, which work well on fine grains, and still has as long life as metal bond: resin bond with metal powders. Below are recommendations from manufacturer on my site. You may see, they recommend resin bond (Expert line) for all finish operations (fist option is just a joke) , while on others, bonds compete with each other. Advantages of specific bond just should be underlined in combination with other bond, but not offered alone.
Premium nickel is a nonsense, because Ni-coated powders have better heat conductivity, thus better performance, but it works on powered tools.

 

[Diemaker]

How does metal powder added to a resin bond work? What does it do?

 

[abrasivetools]

How does metal powder added to a resin bond work? What does it do?

copper powder in bond increases hardness -> increases tooling life, but bond is still soft enough for polishing
for example: CBN SHARPENING STONES, COMBINED BOND, Poltava

p.s. there are 2 stone manufacturers in Poltava: Poltava diamond tools and Poltava plant of diamond tools

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[ChasingSharpness]

Thanks alot for the information everyone. Last week I had ordered the PDT silver CBN in the "vitrified-metallic" bond. I couldn't find any reviews of this online so I thought it would be interesting to go in completely blind. I will update with my impressions after I have had a chance to test them!

 

[abrasivetools]

Thanks alot for the information everyone. Last week I had ordered the PDT silver CBN in the "vitrified-metallic" bond. I couldn't find any reviews of this online so I thought it would be interesting to go in completely blind. I will update with my impressions after I have had a chance to test them!

I believe, coarse grain should be ok
14/10.... - so-so