(9-12 step 2):
First thing tonight was to buck the remaining rivets on the lower
right elevator skin. The technique I used to do these is exactly
the same as that used to do the rivets on the upper skin of the left
elevator (clecoes in the picture below. The rivet holes not
clecoed along the rear spar can't be done yet because they are also
used to attach the trim tabs as mentioned before) The pics below
are of the left elevator upper skin. Since most queezer yokes
aren't long enough to reach around the trailing edge portion of the
skin the plans simply say to clamp the rear spar to the edge of the
workbench and access can be gained with a bucking bar then. Later
in the plans they describe a technique using a special bucking bar that
is needed in order to reach this same area when the second skin is
attached and there is no easy access to it any more from either
side. I decided to employ this technique now since it actually
seemed more stable, especially since I would be doing this solo.
So here's how I did it... First, I staggered my tables so that the edge
of one table would be flush with the spar in the trim tab area allowing
the spar to be clamped to the table. The other table was brought
forward to position it per the plans to use as the bucking bar
fulcrum. The tables were clamped together in this position.
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The
special bucking bar (included with the RV-10 "upgrade" in most tool
vendor's kits) is long and thin with the bucking face cut at an angle
such that when slid under the skin and resting on the edge of the table
it produces a bucking surface normal to the rivet shank. Not sure
if its clear or not, but the second picture is looking up under the
skin. The bucking bar is positioned just underneath the
rivet. Again, note the tape to protect the spar while riveting!
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When
ready to rivet, force is applied down on the bucking bar, pivoting the
bucking face up against the bottom of the rivet shank. This
actually proved to be a pretty stable method of riveting, although I
almost got complacent a few times and came close to letting the bucking
bar rotate off the rivet... careful!
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The end result... I like it! I think I'll keep this trick in the memory bank... maybe I can use it again in the future!
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