Posts Tagged ‘Jigs’

Drilling rear wing spars

Posted: October 17, 2009 in Tools, Wings
Tags: , ,

All 4 rear wing spars have been drilled using spar drilling jigs.  Through the kind assistance of John Robert,his CNC data for the main and rear spars was used by Johnathon Pritchard to fabricate steel water-jet-cut drilling jigs for the spars that precisely place every rivet and attach bolt hole in the spar webs and spar caps.  The combination of the jigs and the separate spar components (along with some judicious use of clamps and spacers) in a kind of sandwich permits you to drill all of the holes in the assembly with a high degree of accuracy;  John Roberts reports an exact matching fit between his jig-drilled spars and his CNC-cut fittings.  Even though I plan to use hand-fabricated fittings, I still see the use of spar jigs as a time-saver and better guarantor of accuracy.  Once I am done drilling my spars, these drilling jigs will be available for other Midwest-area Skyotë builders to borrow and use; I will make them available at no cost to the borrower except for shipping and return.

P1000719

Matchdrilling tooling holes to spar web with drilling jigs

Using drilling jigs to mark spar taper at wingwip

Using drilling jigs to mark spar taper at wingwip

Spar web placed over lower drilling jig using pins thru tooling holes

Spar web placed over lower drilling jig using pins thru tooling holes

Spacers inserted at tooling pins (will space spar caps apart later)

Spacers inserted at tooling pins (will space spar caps apart later)

Closeup of spar cap spacer

Closeup of spar cap spacer

Upper drill jig plate (sandwiching spar caps) installed & fixed with clecoes

Upper drill jig plate (sandwiching spar caps) installed & fixed with clecoes

Clamps and spacers used to ensure correct spar height dimension

Clamps and spacers used to ensure correct spar height dimension

End view of spar "sandwich" and clamps

End view of spar "sandwich" and clamps

Clamping and drilling along the length of the spar

Clamping and drilling along the length of the spar

Top view showing correct spar height dimension

Top view showing correct spar height dimension

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