Thread: Norton: grit / pot marks

I have a Norton 4/8K stone. I have lapped the stone well with 400 grit wet/dry sandpaper and I still feel grit in the 8k side when I hone. I have flattened the hone also to remove swarf a number of times. I run my hand over the stone under running water and don't feel anything, but do when honing. I see some tiny holes in the surface when I look with a 10x loupe. Would this cause a problem.

Lee Valley said I could exchange. So I'm thinking I will try that, but I want to resolve this problem and determine if it is the hone or sandpaper.

Is there a problem with using sandpaper to flatten stones? I'm thinking of using a DMT if necessary. I live in Calgary Albeta, and the only place I have found them is at Lee Valley. They have a 3" x 8" DiaSharp® Stone, 220x for $52 the 325 is $89.00 and is more than I wanted to spend. Will this leave a good finish on the 4/8k?

Thanks

I had the same problem on my 4k side. It was because of the sandpaper.

I tried a diasharp 325 from a friend. I was very happy with the finish it left on my 4/8.

Michael

The grit from the sandpaper can become embedded in the stone. If you use sandpaper make sure to keep it thoroughly wet and free of anything. As for the holes I don't think they would cause any damage as long as they don't stick up out of the stone.

Originally Posted by binder

Is there a problem with using sandpaper to flatten stones?
Thanks

Not so much the medium as the technique. You need a light touch not to embed particles in the stone.
Sometimes a wipe with some scotchbrite will remove the offending particles. Sometimes a relap will do the same.
Just don't bear down hard & let the paper do the job. Honing shaving lapping ~ all critical of pressure.

I have read on SRP where no less than 3 abrasives company sales reps have said not to use sandpaper for lapping stones. It is not the abrasive so much as it is the glue on the sandpaper which causes particles to become embedded on the surface of stone. You could use loose grit silicone carbide and a glass plate, or a DMT 325, but they said you should not use sandpaper . Hope this was helpful.

Originally Posted by PatPat

I have read on SRP where no less than 3 abrasives company sales reps have said not to use sandpaper for lapping stones. It is not the abrasive so much as it is the glue on the sandpaper which causes particles to become embedded on the surface of stone. You could use loose grit silicone carbide and a glass plate, or a DMT 325, but they said you should not use sandpaper . Hope this was helpful.

I'm not understanding how the glue would be a problem. I thought the loose particles would get imbedded. Would the DMT 220 leave a fine enough finish for the 8k Norton or would I need something after it?

Thanks

The grit, with glue residue, would stick to and therefore embed easier. I use loose 220 grit silicone carbide and water on a glass plate to lap 1 k to 12 k naniwas with no problems. I searched for the thead discussing this about the glue and sandpaper, but couldn't find it.

Just found the thread.

http://straightrazorpalace.com/hones...n-carbide.html