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  #1  
Old 02-11-2013, 12:42 PM
330Jock 330Jock is offline
 
Join Date: Jul 2011
Location: Norfolk, VA
Posts: 123
Default Elevator E-713 Counterweight Hole

OK don't know why this happened but when dimpling e-713 counter weight I got a crack. Is this trash bin or not?
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  #2  
Old 02-11-2013, 12:50 PM
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frazitl frazitl is offline
 
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Location: Las Vegas, NV
Posts: 488
Default why?

Only a guess, but id say stress riser from deburr operation. Lots of streching for the big dimple. Finish hole size with reamer might be better. Doubt it will be a problem, but since its a small part, i'd probably get a new part if it was me. No practical way to repair comes to mind...
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  #3  
Old 02-11-2013, 05:50 PM
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kevinsrv7.com kevinsrv7.com is offline
 
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Default

No Problem, stop drill the cracks with a #60 drill bit and move on.
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  #4  
Old 02-12-2013, 11:02 PM
330Jock 330Jock is offline
 
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Location: Norfolk, VA
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Default

Thanks for the replies guys. New 713 ordered from Van's.
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IO-360 M1B Thunderbolt delivered, Hartzell 74" Composite delivered.
Empennage Finished (except fiberglass), Wings Finished (except FG), Fuselage in progress. Restarted project 6/15/2020
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  #5  
Old 02-13-2013, 12:45 AM
jimgreen jimgreen is offline
 
Join Date: Apr 2006
Location: Vancouver island, BC Canada
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Default

These larger holes often end up slightly triangular if finished to full size with a drill bit. Best to use a reamer if you can. A triangular hole is hard to debur properly and often cracks when dimpled.
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  #6  
Old 02-13-2013, 10:04 AM
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BSwayze BSwayze is offline
 
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Location: Molalla, Oregon
Posts: 955
Default I'll second that

I agree completely with JimGreen. Whenever possible, use reamers to final-size your holes throughout the entire aircraft. You only need one of each... #40, #30, and a few others that you can buy as you go along. Even for those holes that aren't pre-punched, you can drill a subsize hole and finish it with your reamer.
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