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About those stiffening circles around the lightening holes

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rscott(at)cascadeaccess.c
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Posted: Fri Jul 24, 2009 11:23 am Post subject: About those stiffening circles around the lightening holes

Those rings provide strength, although I don't know how much.  And 

flattening them weakens the metal beyond what it was before the groove 

was stamped in them.



One solution might be to just put spacers under your parts, outside the 

rings if your "stuff" spans the diameter of the rings.

Ralph Finch wrote:

 	  Quote: 	
		   Fellow RVers,



 I need to mount some stuff on wing ribs.  But, the ribs have holes cut out

 for lightening...and around each hole is stamped a modest raised/indented

 circle in the sheet metal, for stiffening I suppose.



 It is the raised side that causes problems when trying to attach something

 flat there.  I'd like to somehow squash or flatten a portion of the raised

 circle, just enough so that the things I need to mount will fit flush on the

 rib.  Yes, some things must go onto the rib. No, some of this I cannot mount

 on the other side.  



 What have RVers done to solve this little problem?  



 Thanks,

 Ralph Finch

 Davis, California

 RV-9A QB-SA

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