Double-sided stones with Hapstone R2

D

DFWChief

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Nov 29, 2022
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I had a WorkSharp for a few weeks, and decided I'd like something a little more solid, so ordered a Hapstone R2 and Venev Centaur Series Dual Side Diamond stones. The Hapstone is a definitely a more solid machine than the WorkSharp, except for one thing.

The double-sided stones are a really poor match for the clamps on the R2. There's no plate to get under the beveled edge of the holder, so the stone just presses against the thin edge of the holder, with some weak spring tension barely holding it in place. Easy to get out of alignment or even fall out. The opposite of solid.

I have to suspect I'm just not doing this right. How am I supposed to secure a double-sided stone in the holder so it stays flat and square and doesn't fall out? Thanks for any advice.
 
Hapstone had swivel-able clamps that aligned very well with rectangular stones and backed stones but people misunderstood how they worked, complained they were loose and stripped the screws in the swivels because they didn't understand the concept. Because of warranty returns and abuse due to misunderstood stone clamps and ill-educated YouTube "stars", Hapstone has now changed their stone holders to milled ones that doesn't swivel (similar to other sharpeners).

It really is a pity, but understandable because of all the unnecessary returns and complaints they received.

One way to help rectangular stones work well in regular stone clamps, would be to stick a strip of rubberized tape on the ends of the stones.

Also make sure to get the maximum spring tension you can by adjusting the stone clamps as small as possible.
 
I have an r1 with an even older clamp and the previous gen that 777 edge is talking about. I switch back n forth between venev double sided and cbn stones with a backing plate. I have the tension set so it'll accept either stone without adjusting it. I'm assuming theres still a way for you to set the tension so it holds the double sided stones good enough. I set the tension as tight as I could and still get a backed stone in n out. It's still possible to knock a stone out of alignment so I just don't knock the guide arm around n give it a quick check here n there. With the clamps I have it works good enough that I don't worry about it.
 
Thanks, 777 Edge and stonemedusa62. I moved the adjustable part of the clamp to where the spring is compressed, and that's a lot better. Still seems a bit tenuous, but it works. Some rubbery tape at the end of the stones is also a good suggestion.

​

 
I'll design some swivel-able aftermarket clamp holders for the Hapstone R2 system for Gritomatic if they want to sell them.
 
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777 Edge said:
Also make sure to get the maximum spring tension you can by adjusting the stone clamps as small as possible.
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It's also possible to buy a stiffer spring at the hardware store. I thought the spring that came on mine was pretty weak.

O.B.
 
I posted in another thread too, but here is the swivel-able Hapstone R2 series stone holders that I just finished making. This is how they will work:

 
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Thanks for the update. Close to making a purchase of a Hapstone from gritomatic. When will these be available? Will these help the stability of the edge pro form factor as well?
 
ShelseyWalsh said:
Thanks for the update. Close to making a purchase of a Hapstone from gritomatic. When will these be available? Will these help the stability of the edge pro form factor as well?
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The new standard stone clamps will work perfectly without any problems at all with the Edge pro form factor stones, you would not need anything else. For dual sided, non-backed stones the swivel-able stone clamps are handy but still not really a necessity. If you want a set of them, keep an eye out in future because I just designed these a few days ago. It's up to Gritomatic to print and make them available for purchase.
 
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Thanks for all your information I am soaking up knowledge about the Hapstone from your posts like a sponge! I have a lot of ffg EDC knives under 3 inches will the universal clamps be a good place to start? I read how you are not a fan of the opti clamps.

Also as far as stones when you recommend venevs is that the orions?
 
ShelseyWalsh said:
Thanks for all your information I am soaking up knowledge about the Hapstone from your posts like a sponge! I have a lot of ffg EDC knives under 3 inches will the universal clamps be a good place to start? I read how you are not a fan of the opti clamps.

Also as far as stones when you recommend venevs is that the orions?
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My pleasure, happy to help where I can.

The universal clamps should work very well with most of your knives. When clamping, make sure to use one clamp on a "flat" parallel section of the blade if you can (like the tang area) and the other clamp closer to the tip of the blade. Using this method, you should be able to properly and securely clamp most knives you have.

The Venev Orion series (they have a backing plate and thicker layer of abrasive) is at the top of the food chain when it comes to Venev stones, but if you want to budget then the non-backed dual sided Centaur or Ursa stones leave the same edge on a knife. The dual sided stones are effectively 2 stones in one and have a thinner layer of abrasive, and no backing plate but they are excellent value for money.
 
Wonderful thank you for your quick response. I am at the reviewing and swopping stuff around in my gritomatic cart. Learning more is half the fun before making a purchase!

I have taken a copy of your sharpening instructions posted on here and read it through along with viewing many youtube videos!

I really appreciate your help and hope I can come back to you with more questions if I have them?
 
Hi there Hapstone have just posted a teaser of the Hapstone RS on their face book group do you have any more information. Ready to buy form Gritomatic but now I feel I need a little more information. I understand if there are embargoes etc but anything would be good.

Many thanks
 
ShelseyWalsh said:
Hi there Hapstone have just posted a teaser of the Hapstone RS on their face book group do you have any more information. Ready to buy form Gritomatic but now I feel I need a little more information. I understand if there are embargoes etc but anything would be good.

Many thanks
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Check with Gritomatic directly, I'm sure they will be the first in the US to have them.

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I am was wondering with my slipjoints the length is under 3 inches but the blade width can be down to .63 of an inch or 16mm are the clamps on the Hapstone R2 low enough to allow the sharpen stones to work? I am thinking of inclusive angles in the range 15 to 20ish degrees or so? Many thanks
 
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ShelseyWalsh said:
I am was wondering with my slipjoints the length is under 3 inches but the blade width can be down to .63 of an inch or 16mm are the clamps on the Hapstone R2 low enough to allow the sharpen stones to work? I am thinking of inclusive angles in the range 15 to 20ish degrees or so? Many thanks
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With Hapstone R2 Lite clamps, it should be no problem but It's hard to say for sure with the bigger standard R2 clamps without clamping and checking your specific knives. I'm pretty sure 20 degrees should be fine, but 15 degrees might be close to the minimum with some of your smaller blades.
 
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