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gareywittich2000(at)yahoo
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 Posted: Sun Jun 14, 2009 7:51 pm Post subject: Bolt Hole Clearance - Elevator Horn |
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REF: Regarding the 1/4 inch bolt holes in the Elevator Control Horns, about which the Left & Right Elevator Horns rotate on the center Hinge Bearing fastened to the center of the Horiz Stabilizer.
After drilling these 1/4 inch diameter holes (for the AN4 Bolt), these holes are too close to the weld fillet that welds the torque tube to the perpendicular part of the Horn. The weld fillets on my L & R Horns go ALL the way around the Tube. Thus the AN4 Bolt HEAD and corresponding Nut HEAD will come in contact with the "weld fillet" BEFORE they are tightened.
After reading the "Archieves" for possible solutions and some of my own thoughts it seems the options are (looking for the BEST Option):
1) Die Grind the weld fillet in the area where the Bolt and Nut heads will be, then spot prime with Zinc Chromate.
2) Grind the weld fillet where the Nut Head will be and then use a reduced size Nut (MS21042-4) that has a smaller diameter than the one supplied by Vans.
3) Use regular AN960 Washers and "contour them" to fit over the weld fillet so Bolt Head and Nut fit snug against them. (Will need a longer Bolt than supplied by Vans.)
4) Make a "thick" washer out of stainless steel (i.e. 1/8" thick) and "contour it" to fit over the weld fillets; thus the Bolt and Nut heads have a flat surface to tighten against. Again a longer Bolt will be required. <----- Seems the BEST approach to me. Any subtle issues involved ???
How did YOU handle this situation ???????
Appreciate your comments !!!
Thanks, Garey Wittich Santa Monica, CA
[quote][b]
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bifft(at)xmission.com
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| Posted: Sun Jun 14, 2009 8:20 pm Post subject: Bolt Hole Clearance - Elevator Horn |
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On Sun, 14 Jun 2009, Garey Wittich wrote:
| Quote: | After reading the "Archieves" for possible solutions and some of my
own thoughts it seems the options are (looking for the BEST Option):
1) Die Grind the weld fillet in the area where the Bolt and Nut heads
will be, then spot prime with Zinc Chromate.
> 2) Grind the weld fillet where the Nut Head will be and then use a
reduced size Nut (MS21042-4) that has a smaller diameter than the one
supplied by Vans.
|
I believe that grinding away the fillet on a structural weld is a bad
idea, leaves a stress riser and weakens the part. Van is pretty good at
only using steel where absolutely needed for strength so I doubt there is
enough extra to remove this safely.
| Quote: | 3) Use regular AN960 Washers and "contour them" to fit over the weld
fillet so Bolt Head and Nut fit snug against them. (Will need a longer
Bolt than supplied by Vans.)
4) Make a "thick" washer out of stainless steel (i.e. 1/8" thick) and
"contour it" to fit over the weld fillets; thus the Bolt and Nut heads
have a flat surface to tighten against. Again a longer Bolt will be
required. <----- Seems the BEST approach to me. Any subtle issues
involved ???
|
Either of these sound good to me.
| Quote: | How did YOU handle this situation ???????
|
Just checked my parts, my hole is close, but it has enough space for a
washer and bolt head between this hole and the weld.
Brian Huffaker, DSWL (bifft(at)xmission.com)
RV-8A 80091 Fitting canopy latch.
1/4 Starduster II N23UT flying
<pre><b><font size=2 color="#000000" face="courier new,courier">
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Speedy11(at)aol.com
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| Posted: Mon Jun 15, 2009 6:35 pm Post subject: Bolt Hole Clearance - Elevator Horn |
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Garey,
I read your post and went out to the hangar and checked my elevator horn. My bolt head and nut were clear of the weld, but just barely.
I think I'd go with option 3 or 4. I'd try one and if it didn't work out I'd try the other. I don't think I'd grind away any of the weld.
Stan Sutterfield
Flying in a couple of weeks.
| Quote: | REF: -Regarding the 1/4 inch bolt holes in the Elevator Control Horns, ab
out which the Left & Right Elevator Horns rotate on the center Hinge Bearin
g fastened to the center of the Horiz Stabilizer.
After drilling these 1/4 inch diameter holes (for the AN4 Bolt), these hole
s are too close to the weld fillet that welds the torque tube to the perpen
dicular part of the Horn. -The weld fillets on my L & R Horns go ALL the
way around the Tube. Thus the AN4 Bolt HEAD and corresponding Nut HEAD will
come in contact with the "weld fillet" BEFORE they are tightened |
An Excellent Credit Score367215/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=JuneExcfooterNO62>See Yours in Just 2 Easy Steps!
[quote][b]
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n223rv(at)wolflakeairport
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| Posted: Mon Jun 15, 2009 7:10 pm Post subject: Bolt Hole Clearance - Elevator Horn |
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On my RV-4 I ground a bit of the bolt head away. On the nut side I did not have to modify....
-Mike
Sent from my iPhone
On Jun 15, 2009, at 10:27 PM, Speedy11(at)aol.com (Speedy11(at)aol.com) wrote:
[quote] Garey,
I read your post and went out to the hangar and checked my elevator horn. My bolt head and nut were clear of the weld, but just barely.
I think I'd go with option 3 or 4. I'd try one and if it didn't work out I'd try the other. I don't think I'd grind away any of the weld.
Stan Sutterfield
Flying in a couple of weeks.
| Quote: | REF: -Regarding the 1/4 inch bolt holes in the Elevator Control Horns, ab
out which the Left & Right Elevator Horns rotate on the center Hinge Bearin
g fastened to the center of the Horiz Stabilizer.
After drilling these 1/4 inch diameter holes (for the AN4 Bolt), these hole
s are too close to the weld fillet that welds the torque tube to the perpen
dicular part of the Horn. -The weld fillets on my L & R Horns go ALL the
way around the Tube. Thus the AN4 Bolt HEAD and corresponding Nut HEAD will
come in contact with the "weld fillet" BEFORE they are tightened |
An Excellent Credit Score367215/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=JuneExcfooterNO62>See Yours in Just 2 Easy Steps!
[b]
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