Here's a tighter shot...
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Show posts MenuQuote from: JohnHancock on May 09, 2023, 01:01:27 AMI recently watched a sharpening video from Jonathon Katz-Moses here https://youtu.be/GBjiEmN5HzA and he was getting results in the 110-120 range after stropping. For 25 - 30 deg bevels this seems to be about right.Thanks John. I'll for sure watch it. I'm used to getting below 100 with knives, so I wonder why the difference?
Quote from: 3D Anvil on May 07, 2023, 06:17:01 PMI don't see why you couldn't use the USB as a rest for stone grading, provided the plate is stiff. But I think 160 grit is way too course for the SJ stone.Yes it may be, however I wanted to try it since I use that same diamond plate to flatten all of my other water stones and ceramic stones.
Quote from: tgbto on May 05, 2023, 05:39:27 PMInteresting, could you give the reading taken with a tape measure in between two stripes on the wheel ?
A 50hz phenomenon with a 248mm (trued) wheel would give 1.5 cm.
I don't have the inner diameter of the drive wheel in mind, but it could also be something that happens with every revolution of the drive shaft, it can be easily computed.
I wouldn't rule out that it has something to to with your grading. First off, 400g seems quite coarse to me, that's something I would use for grading my SG, not my SG. Vadim used to recommend 1000g for the SJ. That being said, it's like the stone has been smoothed out by something wobbly...
Quote from: TireguyfromMA on May 05, 2023, 07:52:07 AMHmmm...just guessing, but that looks like a constant oscillation pattern that might be related to manufacturing? Did you notice any oscillation while truing with the TT-50? It would be interesting to run a dial indicator over that stone while rotating it by hand on the motor shaft. I would send those photos to TORMEK product support to hear if they have a good explanation.I did notice some vibration, but not enough to be of concern at the time. Using the TT-50, I didn't notice any vibration other than that created by grinding. I think I will email support on this.
Quote from: RichColvin on May 03, 2023, 03:27:20 AMQuote from: darita on May 02, 2023, 02:53:55 PMThanks all for the replies. Since the edge will be refined whether edge leading or trailing, I'll play it safe and go edge trailing to prevent damage to the very delicate SJ. I know how the SJ absorbs water like a sponge and gets extremely soft after doing so.
The SJ is not particularly delicate. Rather, it can chip easily.
Also, the SJ does not absorb water "like a sponge". In fact, I find that it absorbs it very little water.
Finally, I've not experienced it becoming spongy. But, I only leave the SJ grindstone in water during the time I'm using it. Once I'm done, I remove the water from the stone.
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