Carlos Sa
Joined: 13 Jan 2006
Posts: 96
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 Posted: Wed Oct 25, 2006 6:37 am Post subject: RE : Re: picture of the day + question |
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Hi, Jim
My intent is to drill skin and ribs the same operation - that's why I have all those rivet stems
taped to the flanges. That way I will know exactly how far I am from the edges when I drill.
My flanges are about 22mm wide, so even if there is some error reading their position, I'll be
pretty safe. BTW, my tests show that a cylindrical magnet (about 12 mm in diameter) indicates the
location of the rivet stem with .5 mm accuracy - actually "operator reading error".
Once again, thanks for the comments
Carlos Sa
CH601-HD, plans
Montreal, Canada
--- Jim Hoak <planejim(at)bellsouth.net> a écrit :
[quote]
Carlos,
I built a 601HD 10 years ago. Your work looks great. I used the same method
to hold the nose ribs when I built my Midget Mustang I ( many years ago ),
the one and onle All Metal PDQ ( nearly 30 years ago ) and the HD. However,
I suggest you use the construction sequence of installing the top and bottom
aft skins first ( being very careful to keep the whole thing square and
level as you drill and rivet ) before installing the nose ( leading edge
skin ). You will probably use straps to pull the L/E skin into place. Having
the rest of the wing square and level ( and secured that way ) is important
when drilling the L/E skin in place. I built a twisted left wing the first
time around - be careful.
Also be aware that the nose ribs, even though you have them secured with the
wooden blocks and threaded rod, can still flex some. I would still put the
thin black line down the center of the flange of all the ribs, including the
nose ribs, before starting the drilling operation. When the 3/32" ( #40
bit ) hole is drilled through the skin, you will feel better to see that
black line just under the hole.
That is a unique trick using the rivet stems taped to the edges of the
flanges. I would never have thought of that and I've been doing this stuff
for about 50 years.
Good luck with your building.
Jim Hoak 601HD Rotax 912UL 532 hours.
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CH601-HD, plans
Montreal, Canada |
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