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ifly4fun2(at)sbcglobal.ne
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 Posted: Thu Jan 17, 2008 7:58 pm Post subject: 701 Rudder Tip Rib Help |
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Hey All,
I have my first scratched rib (7R1-5) just about formed but I'm running in to material starting
wave at the nose, even after crimping. The top view of 7R1-5 calls for the 3mm of material to
extend beyond the form block of the nose of the rib, is this amount in addition to the 2mm
allowance required for the 1/8" bend radii? or should the material just be trimmed 3mm larger than
form block? I made the nose material 5mm larger than then the form block to take into account the
bend radii which I think is too much but I need some reassurance.
Likewise with the rib flange, the top view shows of 7R1-5 call for 16mm this conflicts with the
cross-sectional view of the flange dimension of 16mm if you build in 2mm for the radii. Should
the top view show the flange to be 18mm to account for the material required for the bend? I cut
the material 18mm larger than the form block outline is this correct or am I trimming back?
do not archive
Art
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Fri Jan 18, 2008 3:51 am Post subject: Re: 701 Rudder Tip Rib Help |
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I layed out mine on the Al by, drawing the basic form block outline and then adding 3mm to the front and 16mm to the sides. You do have to pull the metal back around the side a lot and it takes a bit of patience. I'm using a rubber mallet and a hard weighted plastic hammer. The rubber one seems to pull better and the harder plastic one finishes better.
The homebuilt help videos are a big help and the in the "Scratch Building Basics" video they scratch build all the rudder parts. They show it start to finish.
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_________________
“Always do what you are afraid to do.”
R.W. Emerson (1803-1882)
"Real freedom is the sustained act of being an individual." WW - 2009
"Life is a good deal...it's worth it" Feb 1969
Dorothy McCune |
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Bryan Ekholm
Joined: 10 Jan 2006
Posts: 9
Location: Annandale, Minnesota
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| Posted: Fri Jan 18, 2008 5:48 am Post subject: Re: 701 Rudder Tip Rib Help |
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Art,
I used a hard plastic hammer to start the bend on the nose tips and then used the hammer and a piece of smooth aluminum bar to tap out the waves. If you keep working it over with the metal bar the waves will smooth out very nicely over the nose of the form block. Just take your time. There is no need to add an extra 2mm to any of the flanges. When you put in the bend you actually gain a little material length.
Bryan Ekholm
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ifly4fun2(at)sbcglobal.ne
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| Posted: Fri Jan 18, 2008 7:34 pm Post subject: 701 Rudder Tip Rib Help |
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Thanks Bryan & Kevin for your replies. I appreciate you sharing your experience. I realized I
got the material oversizing from the wrong source and will stick to the flat dimensions in the
plans. Its been 10 years since I formed ribs last and I guess I was anticipating everything to
come back to me, boy was I totally wrong. We used wedge shape ash wood mallets back then and now
I'm using a compilation of rubber mallets and a rawhide mallet. Unfortunately I worked from the
center out and when I got to the nose the excessive material started to buckle. I need remove 2mm
of material all the way around and get back at it. Thanks again for the advice. I'll post the
final result whether its gone good or bad.
do not archive
Art
--- Bryan Ekholm <bryanekholm(at)excite.com> wrote:
| Quote: |
Art,
I used a hard plastic hammer to start the bend on the nose tips and then used the hammer and a
piece of smooth aluminum bar to tap out the waves. If you keep working it over with the metal
bar the waves will smooth out very nicely over the nose of the form block. Just take your time.
There is no need to add an extra 2mm to any of the flanges. When you put in the bend you
actually gain a little material length.
Bryan Ekholm
--------
Bryan Ekholm
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=158997#158997
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Fri Jan 18, 2008 8:00 pm Post subject: Re: 701 Rudder Tip Rib Help |
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I'd like to try a rawhide mallet, but I have no idea were to get one.
do not archive
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_________________
“Always do what you are afraid to do.”
R.W. Emerson (1803-1882)
"Real freedom is the sustained act of being an individual." WW - 2009
"Life is a good deal...it's worth it" Feb 1969
Dorothy McCune |
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ifly4fun2(at)sbcglobal.ne
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victorbravo(at)sbcglobal.
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Sat Jan 19, 2008 5:09 am Post subject: Re: 701 Rudder Tip Rib Help |
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Thanks
do not archive
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_________________
“Always do what you are afraid to do.”
R.W. Emerson (1803-1882)
"Real freedom is the sustained act of being an individual." WW - 2009
"Life is a good deal...it's worth it" Feb 1969
Dorothy McCune |
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planecrazydld(at)yahoo.co
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| Posted: Sat Jan 19, 2008 4:37 pm Post subject: 701 Rudder Tip Rib Help |
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[quote][b]
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