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  #1  
Old 02-09-2013, 05:24 AM
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bobmarkert bobmarkert is offline
 
Join Date: Oct 2007
Location: Littleton, CO
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Default How do I drill between wing wall ribs conduit?

Using the search function for ?conduit? ?Rib Holes? (etc. etc.) flooded my computer with a ton of posts but no solution for my dilemma. I need to drill conduit holes (3/4?) in my wing ribs that are already riveted to the front and rear spar. No issues until I got to the wing walk ribs which are too close to allow the unibit and 90 degree drill in. I can?t be the first to have this problem. What new tool do I need to buy :-)
Solutions/suggestions appreciated.



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  #2  
Old 02-09-2013, 05:40 AM
FredMagare FredMagare is offline
 
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Location: Kyle, TX
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Default Unibit Extension

A great little tool to have: http://www.averytools.com/prodinfo.asp?number=9605

But I used it just once. Perhaps you could find someone local who has one and would be willing to loan it to you?

If not, buy a smaller angle drill and flex the ribs a bit to get in there to drill. That's a tool you'll need from time to time.
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  #3  
Old 02-09-2013, 07:43 AM
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Default

I remember doing this on my QB wings, which was even more difficult. I used a unibit extension, but one that I found locally. I also customized my unibit.

All the unibits I had produced too large a hole if I ran it all the way through - so I could reach the next rib. My solution was to buy a cheap unibit at Harbor Freight and grind off larger diameter steps in the unibit.

This way the max size of the unibit was equal to the desired hole size. This way I was able to use the extension and move from rib to rib without too much hassle.
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  #4  
Old 02-09-2013, 07:52 AM
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Thanks Fred and Rick. I DO owne that extension tool and will grind my unibit down today. I love this site....... build on!
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  #5  
Old 02-09-2013, 09:49 AM
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I got creative with extensions on the QB wing.
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  #6  
Old 02-09-2013, 09:50 AM
aerhed aerhed is offline
 
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Don't grind your unibit. Slip it into place and then put the extension on. Drill your hole then take it apart. You only need to do it a couple times.
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  #7  
Old 02-09-2013, 10:42 AM
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Or get a 3/4 unibit. Saw this one at Home Depot. http://www.parts-express.com/pe/show...number=362-105
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  #8  
Old 02-09-2013, 10:58 AM
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Most of the times that I need a 3/4" hole in aluminum sheet, I use a spade bit intended for wood. But only the ones with points on the corners of the spade seem to work in that application.
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  #9  
Old 02-09-2013, 01:18 PM
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GLPalinkas GLPalinkas is offline
 
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Default

Looks like Bob already has the solution but for those yet to come down this road.....

I used Lowe's Aviation supply extension and ground down a unibit to fit the Lowes's underground sprinkler system tubing (Light weight).





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Last edited by GLPalinkas : 02-09-2013 at 01:21 PM. Reason: added text
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  #10  
Old 02-09-2013, 01:22 PM
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Thanks guys. I could not see the forest for the trees. This was so simple it's embarrassing. Just 5 minutes with a grinder and I was done.
Again you came through!!




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