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Spar bolt hole question

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Larry.J.Husky(at)doc.stat
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Posted: Fri Nov 24, 2006 4:09 pm Post subject: Spar bolt hole question

I have just built my wing jig.  The web was cut by CNC and the middle spar bolt hole was placed in full size on the web per the plans.  I obtained a drill bushing with a 1/8th pilot hole in the middle.  I placed this in the hole in the web.  It was a perfect tight fit.  I drilled a 1/8th hole in the first flat bar and then drilled this out to the full size with a new Dewalt drill bit.  I did this on all 4 flat bars and put everything together.  The holes look great and when I place the spar bolts in the hole, it is snug and will not come out without some push.  I tried this on the jig, before I drilled the holes in my center wing.  My center wing web also has the 3 spar bolt holes already cut and located in the web.  I have everything else already drilled, clecoed and bolted together on the center wing.  Everything looks great and all I need to do to finish it is drill out the 12 holes for the spar bolts.  Will the above described method work well for the 12 spar holes on the center wing.  I sure like how snug they are in the wing jig.    

Larry Husky   

Lakeview, OR     [quote][b]

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p.mulwitz(at)worldnet.att
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Posted: Fri Nov 24, 2006 6:23 pm Post subject: Spar bolt hole question

Hi Larry,



 I'm afraid the approved way to drill these holes is to drill them undersize and then ream them to exact needed size.  If you use a reamer on the aligned holes then the finished hole should be perfect.



 I'm not sure how far you are from my shop (which is an hour from downtown Portland) but if you want to come over for a visit I could loan you the proper reamer.  



 Good luck,



 Paul

 XL fuselage



 

 At 04:08 PM 11/24/2006, you wrote:



  	  Quote: 	
		  I have just built my wing jig.  The web was cut by CNC and the middle spar bolt hole was placed in full size on the web per the plans.  I obtained a drill bushing with a 1/8th pilot hole in the middle.  I placed this in the hole in the web.  It was a perfect tight fit.  I drilled a 1/8th hole in the first flat bar and then drilled this out to the full size with a new Dewalt drill bit.  I did this on all 4 flat bars and put everything together.  The holes look great and when I place the spar bolts in the hole, it is snug and will not come out without some push.  I tried this on the jig, before I drilled the holes in my center wing.  My center wing web also has the 3 spar bolt holes already cut and located in the web.  I have everything else already drilled, clecoed and bolted together on the center wing.  Everything looks great and all I need to do to finish it is drill out the 12 holes for the spar bolts.  Will the above described method work well for the 12 spar holes on the center wing.  I sure like how snug they are in the wing jig.  

 

 Larry Husky 

 Lakeview, OR 

 	
 

 ---------------------------------------------

 Paul Mulwitz

 32013 NE Dial Road

 Camas, WA 98607

 ---------------------------------------------

     [quote][b]

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