Recommendation? Choosing between Poltava metal bonded Diamond/CBN metal/resin bonded stones

What to go with?

  • My progression, diamond/metal/resin kit

    Votes: 0 0.0%

  • Total voters
    8
Joined
Sep 21, 2018
Messages
5
Hi everybody!

Posting my thoughts here in hope I will get some feedback in deciding between metal and resin bonded Poltava CBN stones for a Edge pro like sharpener.
In communication with my source, he has confirmed my thinking and advised me that for most of my home use cases investing in resin bonded CBNs is the smartest choice.

Per his experience METAL bonded CBN stones have:
Pros
-great endurance, 2nd only to diamond, maybe
-as fast or faster cutting in some instances than Poltava metal bonded diamond, maybe
-same thickness across grit progression
-better/finer scratch patern than diamond
Cons
-per manufacturers instructions, before first use, higher grit stones, finer grits, by design, benefit from chemical etching to expose more abrasive from the copper bonding using ferric chloride solution.
-higher price (but just about 25% in my case)
-rougher scratch pattern vs resin CBNs, (maybe a unnecessary time issue for higher grits before the mirror finishing using diamond lapping strops and films)

RESIN bonded CBN:
Pros
-cheaper than metal bonded
-need no mainenance, no lapping, etching etc...
-just as fast as metal bonded
-finer scratches profile than metal CBN and especially diamond
Cons
- could wear out faster if doing a lot of reprofiling with lower grits

Since this is a new setup, a clean slate build, it's an opportunity to get things right in one go.
I would like some input from all users, but especially ones that might have experience in both resin/metal CBNs. Help me choose the right combination in one swoop to avoid unnecessary future double spending.

This would be my current idea of perfect progression using these long lasting stones:
1. METAL bonded Diamond for coarsest grit (for reprofiling, speed, scratches not relevant at this point) usage maybe on 20% of work
- 200/160micron - 80 grit JIS
- 100/80micron - 150 grit JIS
2. METAL bonded CBN for medium/high to grit work (speed, longevity of stones, some scratches OK) used 100% of times
- 50/40 micron - 300 grit JIS
- 20/14 micron - 700 grit JIS
- 10/7 micron - 1500 grit JIS
3. RESIN bonded CBN for finest grit and polish, used on 30% of finishes, (for best prestropping finish, fastest progression)
- 5/3 micron - 3000grit JIS
- 2/1 micron - 8000 grit JIS

Idea is to spend little time as possible on the sharpening station, making as little mess as posible, without need for much stone maintenance.
Usage will mostly be hobby scale, not large volume and mostly kitchen knives, ocasional pocket knifes, dagger etc.
Steel will be ranging from regular soft stainless up to SG2, HAP40 and ZDP-189 for some instances.

Thank you all for reading this longish post and for helping me out with your contributions and experience.
 
Speaking strictly for myself, (without voting), I opted for resin based.

I prefer splash and go with occasional dressing via SiC (grit or stone) to chemical dressing via Ferric Chloride or other chemical means. (I also have a septic system on my rural property so I don't want to introduce more chemicals than necessary into the system or be required to find a means of disposal that will be a hassle.)

Price also entered into my decision when I began investing in some of the resin based bonded hones.

That said, everyone will have to weigh the various factors including price, effectiveness, and required maintenance for the setup involved.

I fully realize that my way is not the best or most efficient way. It's just the path I've chosen at this point.

Many thanks to both David and Shawn and a few other members and vendors for educating us on the potential of these products.
 
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