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Cap strip drilling.

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  • #16
    I often think about our superior, beloved, practical aircraft design and desire it to have more widespread acceptance. I assume that Bearhawk aircraft has considered CNC drilling/punching the wing parts for the factory, and offering them as a kit to the community. I wonder if that might be something in the future. Making the wings easy to build sure would be cool, and think it would only create more demand for the factory as the design increased in popularity.

    I started down the road you guys are on. My decision to abort the scratch building project in favor of a kit was multi faceted, but the time and part quality issues I was producing was a big part of that decision.

    From this side of that decision, I can say that those jigs and CNC files you are making that streamline the drilling of spar web, cap strips, spacer bars/attach angles have very high value. It would be a huge service to the scratch builder if the jigs were offered here on this website for sale or rent. Same goes for a CNC file for wing spar plates. It would be so nice to hit a local fabricator and give him materials and a CNC computer file and come back in a couple of days to pick up the perfectly completed components.

    The best deal would be to have predrilled parts offered from the factory. The second best would be to have files that I could take to my fabricator to have drilled and punched. Third? Maybe have jigs to standardize the drilling available to but or rent.

    I don't see how one could have easy success without the interchange duplicate spacer bars and attach angles that a nice jig would produce. For the folks who are just beginning the scratch building process.....The best practice (I believe) mandates that you make or acquire good jigs (made of steel) that produce those interchangeable parts.
    Last edited by Bcone1381; 10-10-2017, 03:32 PM.
    Brooks Cone
    Southeast Michigan
    Patrol #303, Kit build

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    • #17
      Originally posted by Bcone1381 View Post

      From this side of that decision, I can say that those jigs and CNC files you are making that streamline the drilling of spar web, cap strips, spacer bars/attach angles have very high value. It would be a huge service to the scratch builder if the jigs were offered here on this website for sale or rent. Same goes for a CNC file for wing spar plates. It would be so nice to hit a local fabricator and give him materials and a CNC computer file and come back in a couple of days to pick up the perfectly completed components.

      .
      I did what your are suggesting. I rented all my wing tooling for another builder to use on his project.

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      • #18
        Thank you all for the responses. I should have added more detail. I plan on using a drill bushing with cup and a #40 drill. I am only drilling the rib positions and using a rivet fan between. I am making the .125 plate fittings for the front spar to aid in layout. I am only stacking the fwd and aft caps that sit on the spar.

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        • #19
          Link to the bushing - https://www.browntool.com/Listview/t...=drill+bushing

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