jtrusso(at)gmail.com
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 Posted: Tue Feb 16, 2010 1:01 pm Post subject: RV7-List Digest: 3 Msgs - 02/15/10 |
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Regarding the W-818 Pushrod Assembly, there was a thread whether or not this could be weleded on Vansairforce a while back. Lots of good info in here, some people are pro, some are con.
http://www.vansairforce.com/community/showthread.php?t=25581&highlight=welded+pushrods
On Mon, Feb 15, 2010 at 11:58 PM, RV7-List Digest Server <rv7-list(at)matronics.com (rv7-list(at)matronics.com)> wrote:
[quote]*
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Total Messages Posted Mon 02/15/10: 3
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Today's Message Index:
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1. 07:56 AM - Subject: W-818 Pushrod Assembly (David Stuebner)
2. 10:04 AM - RV-7 F-7114 L and R fit (David Stuebner)
3. 09:52 PM - Re: RV-7 F-7114 L and R fit (Joseph F. Giallo, II)
________________________________ Message 1 _____________________________________
Time: 07:56:29 AM PST US
From: "David Stuebner" <david.stuebner(at)earthlink.net (david.stuebner(at)earthlink.net)>
Subject: Subject: W-818 Pushrod Assembly
Tom,
I wouldn't be a conservative as the others. The plans call out the option
for welding, so it is an acceptable method of joining he pieces. I would
expect that if you told a competent welder what the materials are he/she
would pick an appropriate filler material and weld prep procedure. The bead
doesn't have to be flush, so he/she may not even bevel the egdes. As for
the existing holes, I definitly wouldn't worry about the hole in the end
fitting. It's designed to have holes in it. And I wouldn't worry about two
1/8" holes in the tubing, except one of the goals is to seal the tube up as
best as possible. So, I would rotate the fitting 90degrees and have the
welder fill in the tubing holes. The one drawback to welding is it burns
the primer off the inside. Trade-offs.
And yes, a quick call or email to Van's to confirm won't hurt.
Dave
________________________________ Message 2 _____________________________________
Time: 10:04:18 AM PST US
From: "David Stuebner" <david.stuebner(at)earthlink.net (david.stuebner(at)earthlink.net)>
Subject: RV-7 F-7114 L and R fit
Anyone building a -7 have problems with the spar bolt hole locations in the
F-7114 gussets? I am having trouble getting bolts to go through the center
section and then through the gusset holes. I know the bolts are close
tolerance, but.... I can rationalize that the close tolerance is needed for
the heavy spar end and the heavy components of the center section. Do you
think I can open up the holes in the gussets a bit?
Dave
________________________________ Message 3 _____________________________________
Time: 09:52:06 PM PST US
From: "Joseph F. Giallo, II" <jgiallo(at)mindspring.com (jgiallo(at)mindspring.com)>
Subject: Re: RV-7 F-7114 L and R fit
Dave,
This is a known problem - fortunately solvable. Van's will tell you that
the affected components are match drilled, unfortunately the assembly is
what counts and mis-alignments creep in to their assembly processes. I
had special endmills made that fit inside the holes (both sizes) and
would only cut on the end rather than the sides - thus clearing the
interference without damaging the precision holes. If your misalignment
is slight it may be possible to clear using a machinists scraper in a
careful way. If you can't make this work send me your address off-list
and I'll send you the endmills. Make sure to check both sides of the
fuse spar as well as the wing inserts - I found issues in both (yes it
is a quickbuild). The most difficult part of the repair was aligning the
spar holes once the interference was cleared - I had some expert help
from Van's east coast representative to unrivet the forward portion of
the spar within the fuse, the wings were then plugged in and
pseudo-precision pins (also available if you need them) inserted to
align the parts. The spar was then re-riveted to hold the (now correct)
alignment. Hope this last step isn't necessary in your case but I
mention it as it does happen (mine is not the only case.....)
Regards,
Joe
N813MJ 80hrs
David Stuebner wrote:
| Quote: | Anyone building a -7 have problems with the spar bolt hole locations
in the F-7114 gussets? I am having trouble getting bolts to go
through the center section and then through the gusset holes. I know
> the bolts are close tolerance, but.... I can rationalize that the
|
| Quote: | close tolerance is needed for the heavy spar end and the heavy
components of the center section. Do you think I can open up the holes
> in the gussets a bit?
|
owse
s.com/Navigator?RV7-List" target="_blank">http://www.matronics.com/Navigator?RV7-List
ronics.com/" target="_blank">http://forums.matronics.com
Matt Dralle, List Admin.
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