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Hapstone Premium CBN and Diamond Stones

R

RiffleBrookie

Joined
Sep 30, 2017
Messages
41
I‘m considering some of the Hapstone Premium CBN stones and cannot find much in the way of user experience shared on them.

Has anyone here given them a go? How do they compare in grinding speed, polishing ability and wear rate to the Poltava Metallic or Venev Resin bonded stones? From what I’ve gathered, the bond is some sort of metal and possibly resin composite if that is even possible. I would love to know more.

Thanks!
 
Unless Hapstone has changed they are the same as the Poltava stone,from what I have found is that the 120 400 and 2K stone are a great combo for a working edge stropped with 6 micron Gunny Juice or any diamond compound that is 6 micron.

For a finer finish get the 800 and 1200 Venev stones and use them after the 2K Poltava stone.
 
wade7575, Thanks for the feedback. So is your experience with the Poltava Metallic CBN stones? You found that the venevs are better polishers?

I spoke with Hapstone about the Hapstone Premium CBN and Diamond stones and they were adamant that it used a different binder than the Poltava Metallic stones. A Hapstone rep said the binder was “metal-organic” rather than just metal like the Poltava stones. I was unfamiliar with what “organic” bond referred to, so I did some google-sleuthing and found that the TSProf site calls a resin bond “organic“. So these are possibly Metal-Resin stones? Odd sounding concoction
 
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The 120 400 2K combo is great for a working edge and I would go with the Poltava's as they are proven to be great stones and work well,the Venev's polish better and give a more refined edge.

If your going to do true mirror polished edge's just get the 100% concentration Venev stones and use a 5K and up water stone after the Venev 1200 or 1500,the water stones will do a better job of cleaning up scratch's over anything else.

I also use 60 220 and 400 grit silicon carbide or aluminum oxide powder to flatten and refresh my Venev stones,the Venev's stay really flat and it's refreshing them your concerned with mainly,you don't want to use 60 grit and only grit on the Venev's because you will have deep ridge's and peaks in the resin that will break off easily and then cause the stone to shed diamonds.

You won't see the ridge's and peaks or the diamonds shedding but if you think about it those are weak spots in the resin and going to 400 grit helps to smooth the stone out.
 
wade7575 said:
I also use 60 220 and 400 grit silicon carbide or aluminum oxide powder to flatten and refresh my Venev stones,the Venev's stay really flat and it's refreshing them your concerned with mainly,you don't want to use 60 grit and only grit on the Venev's because you will have deep ridge's and peaks in the resin that will break off easily and then cause the stone to shed diamonds.

You won't see the ridge's and peaks or the diamonds shedding but if you think about it those are weak spots in the resin and going to 400 grit helps to smooth the stone out.
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That is good to know about resurfacing.

I have some of the old non-OCB binder Venev stones and I’d like to give CBN a try. I’ll hold out a little longer for some feedback on the new Hapstone Premium Line or maybe just take a chance on them myself.
 
RiffleBrookie said:
I‘m considering some of the Hapstone Premium CBN stones and cannot find much in the way of user experience shared on them.

Has anyone here given them a go? How do they compare in grinding speed, polishing ability and wear rate to the Poltava Metallic or Venev Resin bonded stones? From what I’ve gathered, the bond is some sort of metal and possibly resin composite if that is even possible. I would love to know more.

Thanks!
Click to expand...
I just got a set of hapstones off the swap and they impressed me. I agree with Wade the venev will finish better.
Reprofiling k390 cruwear s90v and 110v rex 45 on tsprof kadet was the fastest I've ever raised a burr. The initial impression is they might be the nicest stones out there for the price.

I have plates, boride, SiC, venev 100% and now these cbn from hapstone. Below 65 hrc they are super fast cutters above 65 they are still faster than venevs.
I haven't used them on lower hrc and probably won't.
Cheers ....noting op was in March you prob got some by now.
 
LetsgoBrandon said:
I have plates, boride, SiC, venev 100% and now these cbn from hapstone. Below 65 hrc they are super fast cutters above 65 they are still faster than venevs
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Hi there, pardon me for asking questions to this “older” post. I see that you have a set of the Hapstone premium CBN stones. It’s the CBN stone you have, right? If I’m not mistaken they have the combined metal-organic (resin) bond. Are you still happy with them? Have you used any other CBN stones you’d compare these to? I would be very grateful to any info you can give me on them. Thanks a bunch in advance.
 
huntyukon said:
Hi there, pardon me for asking questions to this “older” post. I see that you have a set of the Hapstone premium CBN stones. It’s the CBN stone you have, right? If I’m not mistaken they have the combined metal-organic (resin) bond. Are you still happy with them? Have you used any other CBN stones you’d compare these to? I would be very grateful to any info you can give me on them. Thanks a bunch in advance.
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I got the Hapstone Premium CBN stones and the Poltava Premium CBN stones from Gritomatic. They are quite different, as I pointed out in an earlier post somewhere. I like both of them. The bottom line is that the Hapstones polish better and the Poltavas cut faster at the same grit rating. I tend to use the Hapstones more because they are quieter, but for reprofiling I prefer Poltava. For serious reprofiling, I might use some cheap Chinese diamond stones to get started.
 
Another Shepherd said:
I got the Hapstone Premium CBN stones and the Poltava Premium CBN stones from Gritomatic. They are quite different, as I pointed out in an earlier post somewhere. I like both of them. The bottom line is that the Hapstones polish better and the Poltavas cut faster at the same grit rating. I tend to use the Hapstones more because they are quieter, but for reprofiling I prefer Poltava. For serious reprofiling, I might use some cheap Chinese diamond stones to get started.
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Based on this post (thanks Another Shepherd) I bought a 2,000 & 5,000 Hapstone (to finish off after jende 300 & 600 and Atoma 1,200).
Really happy with results on the Hapstone R2 and 20CV Griptilian.
Bit expensive though... might need to buy another knife to justify the purchase 🤔
 
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Pomock said:
Based on this post (thanks Another Shepherd) I bought a 2,000 & 5,000 (to finish off after jende 300 & 600 and Atoma 1,200).
Really happy with results on the Hapstone R2 and 20CV Griptilian.
Bit expensive though... might need to buy another knife to justify the purchase 🤔
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Did you end up getting the Hapstone, or Poltava 2k and 5k?
 
Right on! I just ordered very similar stones from Ukraine. Also metallic-organic bonded CBN. I like them a lot. Was thinking of writing up a little review of them when I have more time and used them more extensively. So far I’m very happy with them. The 5k should get you a nice polish, I assume?
 
It does and is really smooth and quiet in use.

I used a bit of water on it and noticed the discolouration was concentrated towards the centre so I may check flatness over time.
 
That’s good to hear. I’m very happy with mine too. I use a drop of honing oil. I like it a bit better than soapy water. Nothing wrong with dish soap water. I still use it on and off. I personally prefer honing oil, or any light weight mineral oil, on most of my CBN or diamond stones. I find it’s a tad cleaner, lubricates a bit better and keeps the “sludge” out better. I also find it simpler. That’s just me though. I like to keep my stones wet, which means adding water fairly often. With oil I just put on a drop or two and that’s it until I’m done with the stone. Then I just wipe it off with microfibre cloth and put it away. Every so many sharpenings I clean the stones with Barkeepers friend, or isopropyl and a toothbrush.
 
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