DMT-8C for Chinese 12K

[AustinC9]

Is it ok to use a DMT-8C to lap a chinese 12k?
I'm wondering because of their varying grits. The DMT-8C won't damage or roughen my polishing stones will it?

[Chady]

I believe that it is, I've been reading threads about the 12k as I received mine and still need to lap it as well. Don't recall if it was here or at srp, probably both places.

Edit: http://www.badgerandblade.com/vb/showthread.php?t=28478

Here joel describes lapping of hones and other stuff. The 325grit d8c is what's used there.

[ScottS]

I'd check over on SRP. I've been considering a 12K, and there are three or four posts from people who suggested that lapping it damaged their 8C's

[Mr_Sparkle]

Well I just lapped my Chinese 12K a few days ago on my D8C and it worked perfectly!

I was actually worried something was wrong since my pencil lines went pretty fast, but I drew them on several time and in all Id say I diddnt have to lap it for more then 10-20 mins. I guess i had a pretty flat stone to start with.

My D8C seems as good as ever with no damage at all, however one word of warning is to watch the corners of the D8C.

One corner has a tiny raised lip on that scratched the polishing stone and brings the lapping to a halt. So just make sure yours dosnt have those corners on.

The key is to let the stone do the work, dont apply any weight.

I also found I had to wash the stone and plate several times since the slurry really builds up fast.

Good luck!

[asbjorn]

I do.. and it looks very fine. Since the DMT's are a bit rought when they are new, I would newew lap an C12K with an brand new D8C though, but that is only a feeling I have..

[heavydutysg135]

I'd check over on SRP. I've been considering a 12K, and there are three or four posts from people who suggested that lapping it damaged their 8C's

No, the Chinese 12K will not damage the DMT; I think you are confusing the Chinese with the Spyderco's.

[ScottS]

No, the Chinese 12K will not damage the DMT; I think you are confusing the Chinese with the Spyderco's.

http://www.straightrazorplace.com/forums/showthread.php?t=18123&highlight=chinese+lapping

I overestimated the number of negatives, but there were one or two. It looks, for the most part, like most had success

[Bruce]

The problem is bearing down too hard on the DMT8C with the Chinese 12K. Just try to use the weight of the stone with just a bit of help from your hands. One end of my old DMT8C is minus its jewels because I really pushed down hard and may have used too little water while lapping a 12K. I have tried lapping another 12K for a friend, on a different D8C, with no ill effects, but I used very little pressure, did the lapping under running water, and started with the new D8Super Coarse (whatever the 120 grit is called) so I only had to clean up the 120 grit scratches - which takes plenty of strokes.

good luck

[asbjorn]

http://www.straightrazorplace.com/forums/showthread.php?t=18123&highlight=chinese+lapping

I overestimated the number of negatives, but there were one or two. It looks, for the most part, like most had success

No one sad that the D8C was destroyed during lapping an chinese three?, I mentioned that my D8C seemed to be full of ceramic very fast when lapping an shapton, but no problems whatever with other stone.
Remember the Shapton is an 16 stone, very fine grit. After washing the D8C properly several times it still looks ok.

There was also some discussions about the hardnes of the Chinese, it is hard, but not that hard. It will sometimes take time to lap it, but I cant see that you would destroy the D8C.
Some mentiouned that you can wear down the norton lappingplate, but that is an completely other stone.. as far as I see it, not comparable with the D8C.

[AustinC9]

Thank You Fellas!

[joel]

Diamond is the hardest object known to man. If you are able to screw it up with a softer surface.... you probably shouldn't be taking sharp things to your face :biggrin:

[drfred]

I soaked mine for a full day and didn't have any problems lapping with the D8C. You do have to keep it under running water to keep the slurry off.

Fred

[Bruce]

Joel,

I disagree. Some of us have a touch, a gift if you will of being able to reduce the best to the basest by only the laying on of hands. I'm sure I washed those magnificently hard diamonds down the drain by breaking their bond to the nickel matrix as I still have the shiny nickel on the steel plate - only the grit is missing.

I must just learn to use this gift I have as I may be able to raze buildings with only a touch, clap thunder on a clear day, spit whitewater into a calm stream, eclipse the moon with a squinty glare. :glare: My head swells with the speculation.:drool:

Yes, and I dare to shave with a str8.:eek:

[asbjorn]

With a swollen head, and the gift of your hands, I would newer use an razor... :D

[Chrisl]

Add a +1 to the no problems lapping a Chinese 12K using a D8C. I had no problems doing this and neither damaged the other. It took 30 min+ to lap the thing on just the top surface though.

I've used the stone very little, but for $35 it doesn't bother me that it's in my "honing stable" virtually unused at this point. I probably should have waited a bit longer to get my Shapton 16K Ceramic on Glass stone (which is currently my favorite polishing stone hands down) since the Shapton 16K is making my other polishing stones including my two yellow coticules long for attention they're not getting.

Chris L

[Sticky]

You can't damage a D8C unless you use too much pressure. Excess pressure can break the diamonds out of the nickel plating.

I have lapped Spydercos for over 80 hours using light downward pressure on a D8C. No damage yet.

I did test it, and managed to get the diamonds to start break-out by using well over 40 pounds of downward pressure....

[heavydutysg135]

You can't damage a D8C unless you use too much pressure. Excess pressure can break the diamonds out of the nickel plating.

I have lapped Spydercos for over 80 hours using light downward pressure on a D8C. No damage yet.

I did test it, and managed to get the diamonds to start break-out by using well over 40 pounds of downward pressure....

Thanks for the information. WOW, 80 hours!

[Soopercat]

You can't damage a D8C unless you use too much pressure. Excess pressure can break the diamonds out of the nickel plating.

I have lapped Spydercos for over 80 hours using light downward pressure on a D8C. No damage yet.

I did test it, and managed to get the diamonds to start break-out by using well over 40 pounds of downward pressure....

It really took 80 hours to lap your spydercos. I have 3 and was thinking about lapping them, BUT and I do say BUT, I'm not willing to give up 2 work weeks of my life to do so. It cost me $100 for all three, at a decent hourly wage your entering the (IS THIS THE BEST USE OF MY TIME) question. Does spyderco sell a Norton like lapping stone for their hones? Maybe this is a separate thread.

Kind regards,

[Sticky]

I am a stubborn type and my Spydercos were all barely within the .020 allowed and stated tolerance. Therefore they were not technically defective, and I didn't want to send them back to Spyderco.

I have heard that Spyderco will replace "unflat" hones with ones that will be "flat enough" to sharpen a razor. Try yours first and see if they work ok "as is". The flatter your hones are, the better and faster they will work...

[Soopercat]

I get it, how did you test the 0.02? I have a DMT 325/1200 and was thinking about it, but 80hrs.... whaaa my Chinese 12k only took 10 minutes tops for both (did it twice on both sides) random X patterns to be erased on both sides.

kind regards

[asbjorn]

Spyderco is completely different than the C12K, I lapped the C12K, but my Shapton, which is not so different from Spyderco's, is also a beast to lap.. takes ages.. Would be better to lap on an non-contiguous plate, like the Shaptons DGLP or something like that. But at cost..

[Sticky]

I get it, how did you test the 0.02? I have a DMT 325/1200 and was thinking about it, but 80hrs.... whaaa my Chinese 12k only took 10 minutes tops for both (did it twice on both sides) random X patterns to be erased on both sides.

kind regards
I used a sinebar/plate as a surface plate and a dial indicator from my old toolbox. For practical purposes I'd just try them and see if they work as is. Or maybe pencil-mark them and lap a couple minutes to see how close they are.

Some folks get lucky with the Chinese being close to flat and some don't. Several users have spent hours lapping them.