Thread: Pockmark in Chosera 1K

Originally Posted by benhunt

No not the white spot (I think that's just dust or something). In the 2nd photo it's more visible, about halfway down the visible surface, near the left edge.

I checked it with a level and it looks flat. Do you still think it would be worthwhile to lap it?

When I first bought my naniwas, there was a top layer of binder that holds the grit together, little to no grit. Once it is lapped away, they worked beautifully. Grid pattern as well would be a good idea. It could be just microns short of flat, but you might as well get it as flat as you can.

How deep is it ? I'd probably just lap it and hone if it isn't too bad. OTOH ....... these do have a record of cracks developing with some users. Mine is years old and so far so good, but my Chosera 5k has some cracks developing at the edges. Harmless so far. Unless you're 'hot to trot' with it, I'd maybe ask for a pre-paid return label and a replacement. Brand new, and they ain't cheap, should be flawless AFAIC.

Originally Posted by JimmyHAD

How deep is it ? I'd probably just lap it and hone if it isn't too bad. OTOH ....... these do have a record of cracks developing with some users. Mine is years old and so far so good, but my Chosera 5k has some cracks developing at the edges. Harmless so far. Unless you're 'hot to trot' with it, I'd maybe ask for a pre-paid return label and a replacement. Brand new, and they ain't cheap, should be flawless AFAIC.

+1 on lapping it out.

Just received my Chosera 1k today. It came with the base, which I very quickly decided I absolutely hated. Turned the stone upside down, filled the base with boiling water, pouring and repeating until the corners of the base were heated enough to stick a metal spatula under the corner. Little wiggle here, little wiggle there, push to the other side, wiggle again... POP... wiggle some more... done. Base removed!

Then I took a handsaw and cut it to my preferred size, 140 x 70. I have a huge tomo now to speed it up.

Lapped it on 80 sic, then 120. Trust me, that can be lapped off. I lapped raw side of rock with 80 sic dead flat in under 2 minutes. I'm way too impatient and greedy and impulsive to return and wait on shipping.

It's a lot harder than I expected, that's for sure. I cut a Guanxgi and a King 1k before with a handsaw. The Guangxi took 45 minutes... the King 1k was so soft I swear I could've bit it off... the Chosera took over an hour... I had to go to home depot and use one of their more aggressive for-customer-use handsaws... finally came out.

Awesome stone though! You bought a winner!