Thread: Naniwa Lapping plate - NOT flat.

Actually kevint gave you the real tip. Lap the lapping plate. It may be 120 or maybe like the GDLP 325 but if it is 120 lapping with 80 grit on glass or a granite plate will solve the problem.

Had the same issues with the Naniwa lapping plate. I checked it against a precision ground bar (for leveling frets on a guitar) and it was dished in one spot and rose in another. A check against a DMT that showed flat on the ground bar gave the same results.

I wish I would have checked prior to wasting time lapping with this plate...the DMT fixed the issue in quick order and I'm only out the time/stone height.

I have a friend that can translate the writing on the package and have scanned/sent it off hoping for a bit of help. My gut feeling is that the picture indicates that a separate abrasive is meant to be used as well.

-J

Naniwa's lapping plates work a hell of a lot better if you charge them with coarse SiC powder. I have the 24 grit jumbo size plate (not flat BTW) and use it with 80x SiC powder. I only use this for getting real deep grooves (from knife sharpening) out of stones before switching to a DMT to wrap it up. It gets me in the ballpark and saves some wear on my diamond plates. I couldn't imagine trying to flatten this thing - yikes!

Dave, lately I've been using the DMTXX to knock off a pencil grid, drawing another grid and doing that on my DGLP. Saves a lot of time and wear on the more expensive plate. Sometimes I just do it with the XX and call it good. I haven't had the naniwa to work with as I am pretty set with lapping plates.

Hi,

My Naniwa lapping stone wasn't flat as well. It responded well to 160, then 220 grit silicon carbide paper on glass.

They do seem to wear and dish reasonably quickly, and therefore it is best to re-flatten frequently.

I eventually moved over to using a DMT325 to flatten my hones

Have fun !

Best regards

Russ

Sounds like the consensus is using grit powder and planning on using a DMT after for a smooth finish. I was hoping that this would be an alternative, but looks like I'll stick with a 325 DMT. The vendor is willing to take a look at it, but I think I'm expecting too much from it. No reason to spend on return shipping from where I'm at. It does work wonders to round over the edges. If I ever get the translation back, I'll be sure to post it.

Thanks,
J

Originally Posted by sboness

And these were already perfectly flat as I had lapped them a month ago on a nice thick piece of tempered glass with 320 grit wet and dry.

IMHO , you can't beat plate glass and wet/dry paper . I've never needed a lapping plate , and never will . I figure , if something already works well , why change it ?

Originally Posted by dave5225

IMHO , you can't beat plate glass and wet/dry paper . I've never needed a lapping plate , and never will . I figure , if something already works well , why change it ?

Thanks for all your feedback gentlemen. I know have a DMT 325 and it's doin' the trick.
Your right about how quickly the Naniwa's dish...

...Hi everyone...quick question...being a newb, what IS lapping?

Originally Posted by certifiedbodyman

...Hi everyone...quick question...being a newb, what IS lapping?

Ask & ye shall receive
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