One of the side effects from LCP is that I am now paying much closer attention to many of the holes in the my 9 kit with undersized holes. When I final drilled the wing skins to the ribs with a reamer I noticed that even when I tried really hard to align the holes perfectly, I could often see primer remaining on the inside of the hole in the rib.
That means I must have created a very slight figure-8 where the final hole is slightly misaligned with the pre-punched hole and part of the pre-punched edge is outside the final hole. That’s why there is still primer.
This leads me to the following question: is it better to final drill ribs and skins separately or do them both at the same time while clecoed together.
On the Pros for separately I see that both holes end up perfectly round (and for LCP with the full HAZ removed).
Another Pro is the there won’t be any figure 8-s.
On the Cons for separately I see a potential for slightly misaligned holes.
Overall I think the Pros outweigh the Cons since when dimpled the slight misalignment should be well within the tolerance of how dimples align for riveting.
With the prepunched holes it’s not like final drilling offers much wiggle room for where the final hole should be.
If the misalignment is large I’ve accidentally created significant figure-8 holes in the past that I ended up using oops rivets for because they were now oversized. Drilling separately would remove that risk as well.
What do y’all think about final drilling without the parts clecoed together? Viable option or recipe for disaster?
Thanks
-Lars, building a 9
That means I must have created a very slight figure-8 where the final hole is slightly misaligned with the pre-punched hole and part of the pre-punched edge is outside the final hole. That’s why there is still primer.
This leads me to the following question: is it better to final drill ribs and skins separately or do them both at the same time while clecoed together.
On the Pros for separately I see that both holes end up perfectly round (and for LCP with the full HAZ removed).
Another Pro is the there won’t be any figure 8-s.
On the Cons for separately I see a potential for slightly misaligned holes.
Overall I think the Pros outweigh the Cons since when dimpled the slight misalignment should be well within the tolerance of how dimples align for riveting.
With the prepunched holes it’s not like final drilling offers much wiggle room for where the final hole should be.
If the misalignment is large I’ve accidentally created significant figure-8 holes in the past that I ended up using oops rivets for because they were now oversized. Drilling separately would remove that risk as well.
What do y’all think about final drilling without the parts clecoed together? Viable option or recipe for disaster?
Thanks
-Lars, building a 9