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Newbie question about scratches

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rngurley(at)mindspring.co
Guest

Posted: Sun Dec 31, 2006 6:09 pm Post subject: Newbie question about scratches

I am currently working on my horizontal stabilizer forward spar.  When I pulled the blue plastic off of the spar, I found some handling damage scratches from ½ to 3 thousands (.003) deep.  They run both with and across the gain.  What is the best way to polish these out?  

   

Thanks   

   

Dick Gurley  

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pitts_pilot(at)bellsouth.
Guest

Posted: Sun Dec 31, 2006 6:44 pm Post subject: Newbie question about scratches

Unless you're planning on polishing the whole airplane ...... I'd give the scratches attention when I was prepping to paint.  By the time you're done, there will be a lot more than just these scratches!!!

 Linn

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 Dick Gurley wrote:

 [quote]                                   

I am currently working on my horizontal stabilizer forward spar.  When I pulled the blue plastic off of the spar, I found some handling damage scratches from ½ to 3 thousands (.003) deep.  They run both with and across the gain.  What is the best way to polish these out?      

       

Thanks       

       

Dick Gurley      

Empanage   

            	  Quote: 	
		  

	
 [b]

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jdalton77(at)comcast.net
Guest

Posted: Sun Dec 31, 2006 7:04 pm Post subject: Newbie question about scratches

Dick,

  

 I would wait.  If they're really bad you may  want to smooth and prime, but for the most part you'll have so many scratches by  the time you're done that you'll have to scothbrite and prime  anyway.

  

 Jeff

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fehdxl(at)gmail.com
Guest

Posted: Sun Dec 31, 2006 7:52 pm Post subject: Newbie question about scratches

Dick,  



If you don't already have a 6" Scotch-brite deburring wheel mounted on a bench-grinder, then you really should.  It would smooth out those tooling marks in no time at all.  Don't be shocked at the $55 sticker price -- it's worth every penny! 



Here's a link to what I'm talking about.     http://tinyurl.com/y9z62w



 Also, the 1" x 1" abrasives mounted to a die-grinder is, IMNSHO, the only way to de-bur inside edges such as lightening holes.  Just go the the next page from the link above.



In the mean time, some 400 (or higher) grit wet/dry sandpaper will smoothing it out fine. 



-Jim



P.S.  I think the other guys thought you were talking about scratches on the outside of a skin...yeah, there will be lots of those.  Don't wory about them until painting.



 On 12/31/06, Dick Gurley <rngurley(at)mindspring.com (rngurley(at)mindspring.com)> wrote: 	  Quote: 	
		                   

I am currently working on my horizontal stabilizer forward spar.  When I pulled the blue plastic off of the spar, I found some handling damage scratches from ½ to 3 thousands (.003) deep.  They run both with and across the gain.  What is the best way to polish these out?  

   

Thanks   

   

Dick Gurley  

Empanage  

        	  Quote: 	
		  



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KiloPapa

Joined: 24 May 2006
Posts: 142
Location: Pearblossom, CA

Posted: Mon Jan 08, 2007 7:39 pm Post subject: Newbie question about scratches

I treat any scratches at the same time as I am  deburring and preparing the part for priming.  I use the same silicon  carbide sandpaper I use for some of the deburring to blend any scratches deep  enough to be concerned with.

  

 Kevin

40494

tail/empennage

  

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Kevin
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