Lapping plates/stones

Can anyone tell me if this is a good lapping plate/stoneAttachment 108979Attachment 108981Attachment 108982Attachment 108983Attachment 108984 thank you in advance to all who helps out with this thread.

Oh I forgot to give dimentions its 12” long by 9” wide by 2” tall or deep and my digital micrometer reads the same all the way arround. Thanks again. Attachment 108985Attachment 108986Attachment 108987

*edit* Yeah I didn't think before I typed. My bad.

This is not a lapping plate, it is a granite reference plate.
You can use it a s a base for sandpaper sheets that you can use to lap with.

It's .001 flat....Nice...

If you buy some abrasive powder (SiC, AlOx, SiO2 etc.), it will be a nice lapping plate.

However it wil not last very long flat if you will use abrasive powders directly on it as it abrades plate as well as hones.

I was going to go with the wet/dry sandpaper. 220 600 1000 1500 grits

I lap my hones with a DMT325 so I wouldn't be going past around the 320 - 400 wet and dry sandpaper on that plate.
Having said that, I've never tried anything finer for lapping so, maybe someone who has will chime in and share their experiences

Very few stones need anything higher in grit than 325..

Perhaps a few of the Oilstones and certain Japanese Hard stones...

How high you want to go is up to you and your preferences. However remember to wash all the grit from the plate when you changing your papers.

Thanks fellas

Lapping plate is working wonderfully everyone. I just thought I would give everyone an update.

Good to hear.

Still working great