Thread: Lapping scratches...

Take your fingertip and run it around the top edge of your DMT. You may have a divot on the edge. I have had them on more than one of my plates and flattened them out using the shank of a long screwdriver rubbed briskly.

Also you mention the sticking together. Are you lapping in the sink under running water ? If you let swarf build up it might cause the scratches you describe.

Originally Posted by JimmyHAD

Take your fingertip and run it around the top edge of your DMT. You may have a divot on the edge. I have had them on more than one of my plates and flattened them out using the shank of a long screwdriver rubbed briskly.

Also you mention the sticking together. Are you lapping in the sink under running water ? If you let swarf build up it might cause the scratches you describe.

Yes.

I found the area on the DMT that has the "high" diamonds. I'm still trying to smooth it out by rubbing it against my chinese 12k.

The "high" area can be felt, but not seen. The hone itself appears to be just like it should, even under magnification. No defects can be seen.

Just a couple of tall diamonds.

Originally Posted by FloorPizza

Just a couple of tall diamonds.

The solution is simple, remove them and set them in a nice piece of jewelry, and give to the wife/significant other!

Good idea, thanks!

I *really* wish I had the money to take advantage of your sale on the shapton lapping stone. I have 1k, 4k, 8k, 16k, and 30k Shapton on glass, all subject to the abuse of being lapped by a DMT8C that likes to put scratches in them.

BTW, I *really* like the Shaptons a lot. No regrets on spending the rather significant amount on the set. I do kinda wish I had the 2k stone, though. Jumping from the 1k to the 4k sometimes seems a bit steep.

Originally Posted by FloorPizza

Good idea, thanks!

I *really* wish I had the money to take advantage of your sale on the shapton lapping stone. I have 1k, 4k, 8k, 16k, and 30k Shapton on glass, all subject to the abuse of being lapped by a DMT8C that likes to put scratches in them.

BTW, I *really* like the Shaptons a lot. No regrets on spending the rather significant amount on the set. I do kinda wish I had the 2k stone, though. Jumping from the 1k to the 4k sometimes seems a bit steep.

Floor Pizza - I sent you a PM

Update: I was able to remove the offending tall diamonds with a flat blade screwdriver. It now laps 'em smooooth. The 8c laps sooo much faster than the 8E did. Even my Chinese 12k gave it up quickly to the 8C.

I get rid of lapping scratches left my my DMTC by rubbing the stone I've just lapped with another lapped stone that is hard, fine, and non-porous. I have used my C12K, Swaty's, and a Spyderco pocket stone (the "fine" one) for this, and all have worked quite well. I'm sure most "finishing" or "touch-up" barber hones would do this job well, since they tend to be fine, hard, non-porous and slow.

In theory if a hone were perfectly flat no matter what the grit it would not cut, just as you could make a saw out of the hardest steel in the world and without teeth it would be useless. The scratches will be a problem if it forms a repetitive frequency- where the peaks line up and the valleys line up, which will sawtooth your razor. If they are random circular scratches you'll be fine. The hone has literally millions of scratches and textures and what not at the micro level. Thats what makes it work.

I think the concern is that scratches that are large enough to see indicate peaks and valleys that are larger than normal and which might catch the blade and cause micro chipping. Or at least that is my concern.

Originally Posted by holli4pirating

I think the concern is that scratches that are large enough to see indicate peaks and valleys that are larger than normal and which might catch the blade and cause micro chipping. Or at least that is my concern.

Yes, that's it exactly.