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pcondon(at)mitre.org
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 Posted: Tue Sep 25, 2007 6:16 am Post subject: Lightning holes in ribs |
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Beg, borrow, rent or otherwise obtain some chassis punches or conduit
punches to do the holes. Edge lipping the punched holes helps in the
rigidity (over just a plain cut hole). The Fly cutter will hurt you,
especially doing hundreds of holes. I did a wing set via the punch and
a battery drill on slow to operate the punch. All done in one evening I
recall, and the edge lipping of the hole worked out....
......................................................................
....
Patrick Kelley wrote:
| Quote: |
That's a great idea; I wish I'd thought of it. I carefully did the
first
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| Quote: | rib and then used the stock I'd just removed to mark all the rest of
the
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| Quote: | ribs. Even then, I'd clamp the rib in place and rotate the fly cutter
by
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| Quote: | hand to check where it was cutting. By the way, that removed stock is
useful for making small bits. Even the small holes yielded clamping
pads,
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| Quote: | bolt washers (for when I was bolting the longerons to the jig), and
shims.
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[quote]Waste nothing!
Patrick Kelley - RV-6A - working on canopy frame
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d-burton(at)comcast.net
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| Posted: Tue Sep 25, 2007 1:46 pm Post subject: Lightning holes in ribs |
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| Quote: | Beg, borrow, rent or otherwise obtain some chassis punches or conduit
punches to do the holes.
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I did my smaller holes this way. I didn't have large enough punches to do
them all. The rib material is thin enough that it goes pretty quickly with
a fly cutter. On a Van's kit the ribs have pressed in raised rings that you
leave in place when you cut the lightening holes out leaving you a nice
reinforcing flange. I also used a punch to do my conduit holes. That made
short work of those and it leaves a great hole without a burr.
Dave
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