Re: [Harp-L] Flat sanding problems




My 2 cents although I'm not a Harp Mechanic like David my experience is more with ( LAPING)
Or Lap Polishing metal on a glass surface to be perfectly flat we would move the material 
In a figure 8 pattern hitting all edges evenly by using even downward pressure.

This of course was done using heavy duty but fine wet paper.....for plastic that not necessary
But figure 8 ing is a time proven method for hand finishing.
JMHO.....m


On Dec 26, 2012, at 3:56 PM, David Payne <dave@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> At worst, you're rocking. At best, when you move the comb from side to side, there is more pressure on the leading side, less in the back. It's not that much of a problem for normal do-it-yourself flatsanding, but if you are repeating it over, and over and over again as you would if making a comb thinner, that difference is magnified into something very noticeable. A circular pattern for your sanding will help. Its a tricky thing to do, to sand a comb so that it is significantly thinner.
>  
> David Payne
> www.elkriverharmonicas.com
> www.hetrickharmonica.com
> 
> 
> 
> ________________________________
> From: Boris Plotnikov <ploboris@xxxxxxxxx>
> To: harp-l@xxxxxxxxxx 
> Sent: Wednesday, December 26, 2012 9:17 AM
> Subject: [Harp-L] Flat sanding problems
> 
> Hi to all!
> 
> I'm not happy with my flat sanding job. Usually I get stock combs and
> polish them with 2000 sandpaper and it's ok for me and my customers. I'm
> trying to turn standart 1847 silver comb (6 mm) into thinner comb (5.5 mm)
> and it looks flat, but actually leaks, as central of comb is thicker than
> borders. I follow ElkRiver instructions, use 800 sandpaper on a mirror,
> extra comb under to support and minimum pressure, marker lines to look
> where it works, but anyway they're not flat. What am I doing wrong?
> -- 
> Thanks, Boris Plotnikov
> http://borisplotnikov.ru




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