Problem with Hybridz blank

[qquake]

Anybody seen this before? This is after dry sanding from 220-600. I resanded it three times, and the marks came back every time. So I tried Micro Mesh dry, and the marks were still there. Finally, I went ahead and finished it with Pens Plus. That mostly hid the marks, but if you look close you can still see them. A non-penturner probably wouldn't notice, but I do, and it bugs me. The blank is a Hybridz from Rockler. The wood in it is mallee burl. What did I do wrong? This is the fourth Hybridz blank I've turned, and I didn't have this problem with any of the others.

 

[1080Wayne]

I think you have parts of the burl a bit softer than others , which just happen to coincide with radial sandpaper scratches . That said , it doesn`t appear that any lengthwise sanding was done .

 

[qquake]

Not sure that lengthwise sanding would have fixed this.

 

[leehljp]

Jim, everyone does sanding in their own way. For me, I discovered long ago that 220 is for flat wood. On pens, for me, it is hard to get the deep scratches out once I start at 220. Rarely will I start at 320, but usually 400. I mention this because I would often get scratches that continued to appear when I started with low numbers . Even lengthwise sanding does not get deep scratches out without doing some excess sanding at finer grits.

 

[TonyL]

It is a beautiful blank. 1,000 plus ways to skin this one. I would, as I do with most. :
Dry sand to 2000, but use forced air to blow-out debris, then DNA between grits until no sanding powder is on the paper towel.

 

[qquake]

It is a beautiful blank. 1,000 plus ways to skin this one. I would, as I do with most. :
Dry sand to 2000, but use forced air to blow-out debris, then DNA between grits until no sanding powder is on the paper towel.

I didn't think about DNA and compressed air. I'll try that next time.

 

[Dorno]

Why do you use Micro Mesh Dry ? I have never used it dry

 

[qquake]

Why do you use Micro Mesh Dry ? I have never used it dry

I don't think it would be a good idea to wet sand wood.

 

[TonyL]

Why do you use Micro Mesh Dry ? I have never used it dry

I don't use MM dry (but one can and some folks do, just a lower speeds). I use Abranet to 600, the 3M or Nortons 800, 1000, 1200, 1500, 2000. then buffing wheels and compounds.

I use the same approach for all (except M3, then I use damp MM). I used to damp MM, but I prefer the buffing wheels. Good question.