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Lightening holes in ribs

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acepilot(at)bloomer.net
Guest

Posted: Sun Sep 23, 2007 2:34 pm Post subject: Lightening holes in ribs

Bought an OLD wing kit for my RV-4 recently.  The lightening holes need 

to be cut out on the ribs.  Does anybody have a pet method for 

accurately finding the center of the cutout...I will be using a fly 

cutter to do the cutting job.



-- 

Scott

http://corbenflyer.tripod.com/

Gotta Fly or Gonna Die

Building RV-4 (Super Slow Build Version)

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Philippjw54(at)aol.com
Guest

Posted: Sun Sep 23, 2007 3:02 pm Post subject: Lightening holes in ribs

Just make sure when using the fly cutter that the cutting edge of the fly  cutter is right on the edge of the circle being cut out. There's no exact  science to finding the middle of the circle. By trial and error and with a  little patience finding the center of each circle is not really difficult. Put  the fly cutter in your drill press and then start by checking at each 90  degree location. If it looks good and your satisfied then go ahead and make your  cut. You just need to be brave and go for it. You don't need to be perfect but  try for just a little under the maximum hole diameter. Remember, you have a lot  of holes to cut and I would start by cutting all the large holes first and work  your way through all the ribs. Then go to the next size smaller hole and  continue until all those holes are done and then go to the smallest holes and  cut them. It will take a couple of nights to complete all the lighting holes but  eventually you will finish. Then you have to use a scotch brite pad and  polish all the cut edges until there are no rough spots. They should be smooth  as a babys bottom. Then prime as soon as you can using your favorite primer.  Good luck.



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