Double-checking
I’m about to do this step, and just want to double-check… I don’t think I’m correctly visualizing where the strip has to go to protect the spar cap while still allowing me to enlarge the flange holes.
I’ve got the doubler clecoed to the skin and spar flange, all the holes lined up and everything looks right. However, on the left wing the drill bit will emerge almost an inch from the spar web aft face, and nearly parallel to it; on the right wing it’s much closer, ~1/8”, but there’s still no danger to the spar cap (the bottom of the web, right?) if I drill perpendicular to the doubler/skin/flange.
I don’t see how the steel strip will help, since it has to be pretty narrow to avoid blocking the (enlarged) holes aft of the spar that I’m enlarging, as well as the ones fwd of the spar that I’ve filled with clecos. If I do put the steel strip in place on the right wing and drill 10 or so degrees off perpendicular, the point of the bit will still miss the strip before it scratches the aft side of the spar web (or those fat pre-set rivets). It would only save me if I accidentally started a new hole forward of the holes I’m enlarging.
Does this sound right?
(I’m asking partly because neither I nor my local big-orange-box hardware store have any <.040” steel sheet handy, and I don’t want to take more time searching for it unless I know where to put it that’d help protect me.)
Thanks!