Vivi wrote: ↑
Wed Oct 23, 2019 2:56 am
Thanks for the information. I'm trying to do more reading on Venev's.
One thing has me confused. The diamond layer is only 1mm thick, yet they say it should last linger than a DMT? If they wear enough that flattening them is a thing, and the diamond layer is only 1mm thick, how is that going to last a decade of sharpening?
Also FWIW I've always used my stones dry. All my stones. Along with flattening stones I couldn't imagine having to lube my stones. I like the lack of mess and setup sharpening on a single dry stone offers.
No worries, Vivi.
I’ve wondered the same thing about the 1mm thick abrasive layer and what bearing it would have on stone longevity.
The layer of binder is actually 2-3mm thick on my examples, although I couldn’t say if the density of abrasive is consistent throughout. It may be that 1mm is just a minimum guaranteed thickness.
The binder is very hard - I’ve used mine a lot over about a year so far, and as I said, I’ve never had to re true the surface after the initial lapping.
Even 1mm of depth is 1000 microns thick. So if we’re talking FEPA-F 240 grit particles, they’re still less than 50 microns, so there’s at least 20 completely fresh layers of diamond abrasive in that amount of thickness.
If we’re talking about FEPA-F 800 grit at about 6 microns, then there’s over 160 layers of fresh abrasive.
FEPA-F 1200 grit at about 2.5 microns will give at least 400 layers of fresh abrasive.
The DMTs just have the one layer, and as they wear in, some of the oversize diamonds pop out of the nickel matrix, and some fracture a little until they are more consistent in surface finish.
As far as the claim that the Venev bonded diamond stones should last longer than a DMT plate, I can’t speak to the accuracy of that. I can only guess that the above dynamic might have something to do with it.
In terms of lubrication, it is recommended to use a light spritz of water. They don’t build a slurry though, like alumina waterstones do.
I use a little water or Windex on my ceramics and diamond plates anyway. I don’t find it makes much of a mess, and I do it for the minor lubricating benefit and to damp down any microscopic grit and steel alloy particles, which I don’t want to breathe into my lungs.
So yeah, you can’t really get away from the minimal water usage.
Also, the more expensive Naniwa diamond waterstones also only have a 1mm diamond layer, and you can bet they are made to last a good amount of time.