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vmax737(at)hotmail.com
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 Posted: Sun Feb 14, 2010 7:48 am Post subject: W-818 Pushrod Assembly |
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The initial assembly of the W-818 pushrod did not come out as good as I hoped. On the first hole, using a drill press, the opposing hole on the end of the ST4130 did not come out exactly 180 degrees, more like 160 degrees. I'm considering changing course and weld the ST4130 and the rod end together. If I go that route, should I fill the two drill holes that are already there? Any suggestions what kind of instruction to give the welder regarding what type of welding rod to use? If a "bead" is put between the rod end and the tube, I would probably have to shorten the rod by a length equal to the "bead".
Comments or suggestions would be appreciated.
Vmax
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA
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| Posted: Sun Feb 14, 2010 9:47 am Post subject: W-818 Pushrod Assembly |
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At 07:48 AM 2/14/2010 Sunday, you wrote:
| Quote: | The initial assembly of the W-818 pushrod did not come out as good as I hoped. On the first hole, using a drill press, the opposing hole on the end of the ST4130 did not come out exactly 180 degrees, more like 160 degrees. I'm considering changing course and weld the ST4130 and the rod end together. If I go that route, should I fill the two drill holes that are already there? Any suggestions what kind of instruction to give the welder regarding what type of welding rod to use? If a "bead" is put between the rod end and the tube, I would probably have to shorten the rod by a length equal to the "bead".
Comments or suggestions would be appreciated.
Vmax
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Hi Vmax,
My recommendation would be to throw your exiting W-818 out and buy a new one. You're dealing with your life here. Anything having to do with flight controls needs to be 100%. In the long run, you'll look back at this and will be very happy you did it right.
During the construction of my RV-8, my goal has been "no regrets", no matter how big or small. If it wasn't perfect, I did it again, generally with new parts. I have no regrets looking back.
$.02.
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com Matts RV-8 Construction Log
Finishing up...
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dan.pat.b(at)gmail.com
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| Posted: Sun Feb 14, 2010 11:11 am Post subject: W-818 Pushrod Assembly |
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Matt:I'm not a structural engineer but it seems to me you'd be better off with a rivet slightly off the mark than with a weld at that location. A broken weld might buy you the farm - an off the mark rivet is probably of no consequence. My advice: Call Vans and see what they have to say. If necessary - order another pushrod and ST4130 fitting and do it over. What'll it cost - a few dollars and a little bit of time. That fitting is critical and must be absolutely fail-safe - I would not trust a weld.
Dan Bergeron
RV-7A - N307TB
100+ hours since first flight on 8/4/09
On Sun, Feb 14, 2010 at 12:45 PM, Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)> wrote:
[quote]--> RV7-List message posted by: Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)>
At 07:48 AM 2/14/2010 Sunday, you wrote:
>The initial assembly of the W-818 pushrod did not come out as good as I hoped. On the first hole, using a drill press, the opposing hole on the end of the ST4130 did not come out exactly 180 degrees, more like 160 degrees. I'm considering changing course and weld the ST4130 and the rod end together. If I go that route, should I fill the two drill holes that are already there? Any suggestions what kind of instruction to give the welder regarding what type of welding rod to use? If a "bead" is put between the rod end and the tube, I would probably have to shorten the rod by a length equal to the "bead".
>
>Comments or suggestions would be appreciated.
>
>Vmax
Hi Vmax,
My recommendation would be to throw your exiting W-818 out and buy a new one. You're dealing with your life here. Anything having to do with flight controls needs to be 100%. In the long run, you'll look back at this and will be very happy you did it right.
During the construction of my RV-8, my goal has been "no regrets", no matter how big or small. If it wasn't perfect, I did it again, generally with new parts. I have no regrets looking back.
$.02.
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com Matts RV-8 Construction Log
Finishing up...
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rossrv4(at)yahoo.com
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| Posted: Sun Feb 14, 2010 12:48 pm Post subject: W-818 Pushrod Assembly |
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Heyden,I would get new parts. Did you use a V block on the drill press? With one,you can drill through one side of rod and then stop and make sure the rod is centered with bit and then finish drilling. I also like to drill undersize to start with. To help with riveting, drill a half inch hole in a short piece of 2 x 4, then split it. Use these in a vise to clamp rod for riveting so rod will not rotate when squeezing rivet. Dave Ross
--- On Sun, 2/14/10, Heyden Thomas <vmax737(at)hotmail.com> wrote:
| Quote: | From: Heyden Thomas <vmax737(at)hotmail.com>
Subject: W-818 Pushrod Assembly
To: "RV7" <rv7-list(at)matronics.com>
Date: Sunday, February 14, 2010, 10:48 AM
The initial assembly of the W-818 pushrod did not come out
as good as I hoped. On the first hole, using a drill
press, the opposing hole on the end of the ST4130 did not
come out exactly 180 degrees, more like 160 degrees.
I'm considering changing course and weld the ST4130 and
the rod end together. If I go that route, should I
fill the two drill holes that are already there? Any
suggestions what kind of instruction to give the welder
regarding what type of welding rod to use? If a
"bead" is put between the rod end and the tube, I
would probably have to shorten the rod by a length equal to
the "bead".
Comments or suggestions would be appreciated.
Vmax
Hotmail: Powerful Free email with
security by Microsoft. Get
it now.
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