Question about lapping a Naniwa 1K

[Archer808]

I borrowed a Naniwa 1k from a friend today. He gave me the flattening stone he bought with it but the flattening stone is smaller than the hone.

Naniwa: 210X70
Flattening stone: 170X55

So if the flattening stone is smaller than the hone, I don't see how that would work correctly. Shouldn't the full surface of the hone be in touch with the flattening stone to make sure you are grinding down the high areas? Or not?

If that is the case, can I lap the Naniwa on a flat piece of marble with 320 grit wet/dry 3m sandpaper like I did my Coticule?

Thanks guys!

 

[global_dev]

Yes for slab and for first issue, I do figure eights and up and downs

 

[Gamma]

I've lapped plenty of stones with plates that are smaller or shorter in one dimension or another.
It works fine if you do it correctly.
A larger surface is easier to work with though.

 

[Archer808]

It works fine if you do it correctly.

Can you elaborate on method? I am a little lost, if you are on the top of your figure 8, the bottom isn't being touched (and vise-versa for the other end of the 8) and it seems that you would wear the center faster than the edges?

 

[global_dev]

the flattening stone isn't that much smaller (it appears, you are talking a inch difference in each direction for the most part ), not like rubbing a penny on a dollar, more like a nickel on a quarter,

as long as the sectional areas adjacent are flat, then there should be flatness across the hone. at least thats what i think

 

[Gamma]

if you move the plate around enough, and change directions and patterns all along the way - it all works out fine.

 

[Archer808]

Thanks guys!