Today's Message Index:
----------------------
1. 05:04 AM - Predrilling the short strut end 5/16 bolt holes - CH701 (Robert N. Eli)
2. 05:38 AM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (John Bolding)
3. 06:10 AM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (MacDonald Doug)
4. 11:57 AM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (Robert N. Eli)
5. 12:54 PM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (MacDonald Doug)
Message 1
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| Subject: | Predrilling the short strut end 5/16 bolt holes - CH701 |
Folks,
I am predrilling the short strut ends (of the two piece struts) for the
5/16 bolt that attaches it to the wing strut fittings (reference drawing
7-V-10). The U-tab gap on the front strut end is reasonably close to the
thickness of the strut fitting assembly; however, the rear strut end has
a gap that is larger than what is specified on drawing 7-V-10 (which is
1/8 inch). My gap is closer to 3/16, and is about twice the thickness of
the rear strut fitting (which is 0.09 in). I am hesitant to rely on
using the bolt to draw-down this much of a gap. It seems to me that it
would be better to use a shim to take some of excess gap in the U-tab.
Does anyone have a recommendation on what works best to deal with this
issue?
Robert N. Eli
CH701
Message 2
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| Subject: | Re: Predrilling the short strut end 5/16 bolt holes |
- CH701
You are correct, don't draw it in, shim it to fit.
The wider the vacant space the more bending load you place on the bolt,
this is a shear loading application, think I might ask Zenith if a shim
is sufficient.
John
----- Original Message -----
From: Robert N. Eli
To: Zenith701801-list@matronics.com
Sent: Tuesday, January 11, 2011 7:01 AM
Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt
holes - CH701
Folks,
I am predrilling the short strut ends (of the two piece struts) for
the 5/16 bolt that attaches it to the wing strut fittings (reference
drawing 7-V-10). The U-tab gap on the front strut end is reasonably
close to the thickness of the strut fitting assembly; however, the rear
strut end has a gap that is larger than what is specified on drawing
7-V-10 (which is 1/8 inch). My gap is closer to 3/16, and is about twice
the thickness of the rear strut fitting (which is 0.09 in). I am
hesitant to rely on using the bolt to draw-down this much of a gap. It
seems to me that it would be better to use a shim to take some of excess
gap in the U-tab. Does anyone have a recommendation on what works best
to deal with this issue?
Robert N. Eli
CH701
Message 3
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| Subject: | Re: Predrilling the short strut end 5/16 bolt holes |
- CH701
Robert, this might be a silly question but are you sure that you don't have
the front fitting for the other side?- Possibly Zenith sent the wrong on
e if this is a kit plane.- I scratch built mine so they fit really well.
-
Also, is it possible to close the gap in the fork in-a vise so that there
is no bending load applied to the tabs when installed?
-
Doug MacDonald
CH-701 C-GBQX
NW Ontario, Canada
-
Do Not Archive
--- On Tue, 1/11/11, Robert N. Eli <robert.eli@comcast.net> wrote:
From: Robert N. Eli <robert.eli@comcast.net>
Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes
- CH701
Received: Tuesday, January 11, 2011, 7:01 AM
Folks,
-
I am predrilling the short strut ends (of the two piece struts) for the 5/1
6 bolt that attaches it to the wing strut fittings (reference drawing 7-V-1
0). The U-tab gap on the front strut end is reasonably close to the thickne
ss of the strut fitting assembly; however, the rear strut end has a gap tha
t is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). M
y gap is closer to 3/16, and is about twice the thickness of the rear strut
fitting (which is 0.09 in). I am hesitant to rely on using the bolt to dra
w-down this much of a gap. It seems to me that it would be better to use a
shim to take some of excess gap in the U-tab. Does anyone have a recommenda
tion on what works best to deal with this issue?
-
Robert N. Eli
CH701
=0A=0A
Message 4
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| Subject: | Re: Predrilling the short strut end 5/16 bolt holes |
- CH701
Doug,
I do have the full set of front and rear strut ends (thanks to Tommy
Walker's generosity), with the individual part number stickers in place
on each part. The front and rear strut ends have the appropriate
different gap widths between the U flange. You are getting at one of the
issues, and that is that the U is fabricated out of one piece of 4130
and none of my strut ends have the tab portions exactly parallel due to,
apparently, some spring-back during manufacturing. I did close the gap
(make them parallel) using the vice. There is considerable spring-back,
so I had to close the gap quite a bit in the vice so that they would
spring-back to a parallel condition. But, even with this process to help
matters, I still have a significant gap of 2 mm between the rear strut
fitting and the strut end tab. I don't want to depend on the bolt to
pull the tabs down to the strut fitting since this will pull things out
of parallel in the other direction, and not produce a good flat contact
surface between the parts. I have tentively decided to use a steel shim
to fill the 2 mm gap, but will check with Zenith to see if it sounds OK
to them.
Robert
----- Original Message -----
From: MacDonald Doug
To: zenith701801-list@matronics.com
Sent: Tuesday, January 11, 2011 9:07 AM
Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16
bolt holes - CH701
Robert, this might be a silly question but are you sure that you
don't have the front fitting for the other side? Possibly Zenith sent
the wrong one if this is a kit plane. I scratch built mine so they fit
really well.
Also, is it possible to close the gap in the fork in a vise so
that there is no bending load applied to the tabs when installed?
Doug MacDonald
CH-701 C-GBQX
NW Ontario, Canada
Do Not Archive
--- On Tue, 1/11/11, Robert N. Eli <robert.eli@comcast.net>
wrote:
From: Robert N. Eli <robert.eli@comcast.net>
Subject: Zenith701801-List: Predrilling the short strut end
5/16 bolt holes - CH701
To: Zenith701801-list@matronics.com
Received: Tuesday, January 11, 2011, 7:01 AM
Folks,
I am predrilling the short strut ends (of the two piece
struts) for the 5/16 bolt that attaches it to the wing strut fittings
(reference drawing 7-V-10). The U-tab gap on the front strut end is
reasonably close to the thickness of the strut fitting assembly;
however, the rear strut end has a gap that is larger than what is
specified on drawing 7-V-10 (which is 1/8 inch). My gap is closer to
3/16, and is about twice the thickness of the rear strut fitting (which
is 0.09 in). I am hesitant to rely on using the bolt to draw-down this
much of a gap. It seems to me that it would be better to use a shim to
take some of excess gap in the U-tab. Does anyone have a recommendation
on what works best to deal with this issue?
Robert N. Eli
CH701
ist" target=_blank
rel=nofollow>http://www.matronics.com/Navigator?Zenith701801-List
=nofollow>http://forums.matronics.com
blank rel=nofollow>http://www.matronics.com/contribution
Message 5
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| Subject: | Re: Predrilling the short strut end 5/16 bolt holes |
- CH701
Sounds to me like the fittings were made incorrectly.- Zenith will likely
replace them.- 2mm is a pretty big gap.- While I'm sure a shim will fi
x your problem, you paid for a properly built part, Zenith should provide i
t.- It's been my experience that they are-great to deal with so I am su
re they will help you out.
-
Doug MacDonald
-
Do Not Archive
--- On Tue, 1/11/11, Robert N. Eli <robert.eli@comcast.net> wrote:
From: Robert N. Eli <robert.eli@comcast.net>
Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt h
oles - CH701
Received: Tuesday, January 11, 2011, 1:54 PM
Doug,
-
I do have the full set of front and rear strut ends (thanks to Tommy Walker
's generosity), with the individual part number stickers in place on each p
art. The front and rear strut ends have the appropriate different gap width
s between the U flange. You are getting at one of the issues, and that is t
hat the U is fabricated out of one piece of 4130 and none of-my strut end
s have the tab portions exactly parallel-due to, apparently, some spring-
back during manufacturing. I did close the gap (make them parallel) using t
he vice. There is considerable spring-back, so I had to close the gap-qui
te a bit-in the vice so that they would spring-back to a parallel conditi
on. But, even with this process to help matters, I still have a significant
gap of 2 mm between the rear strut fitting and the strut end tab. I don't
want to depend on the bolt to pull-the tabs down to the strut fitting sin
ce this will pull things out of parallel in the other direction, and not
produce a good flat contact surface between the parts. I have tentively de
cided-to use a steel shim to fill the 2 mm gap, but will check with Zenit
h to see if it sounds OK to them.
-
Robert
-
----- Original Message -----
From: MacDonald Doug
Sent: Tuesday, January 11, 2011 9:07 AM
Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt h
oles - CH701
Robert, this might be a silly question but are you sure that you don't have
the front fitting for the other side?- Possibly Zenith sent the wrong on
e if this is a kit plane.- I scratch built mine so they fit really well.
-
Also, is it possible to close the gap in the fork in-a vise so that there
is no bending load applied to the tabs when installed?
-
Doug MacDonald
CH-701 C-GBQX
NW Ontario, Canada
-
Do Not Archive
--- On Tue, 1/11/11, Robert N. Eli <robert.eli@comcast.net> wrote:
From: Robert N. Eli <robert.eli@comcast.net>
Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes
- CH701
Received: Tuesday, January 11, 2011, 7:01 AM
Folks,
-
I am predrilling the short strut ends (of the two piece struts) for the 5/1
6 bolt that attaches it to the wing strut fittings (reference drawing 7-V-1
0). The U-tab gap on the front strut end is reasonably close to the thickne
ss of the strut fitting assembly; however, the rear strut end has a gap tha
t is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). M
y gap is closer to 3/16, and is about twice the thickness of the rear strut
fitting (which is 0.09 in). I am hesitant to rely on using the bolt to dra
w-down this much of a gap. It seems to me that it would be better to use a
shim to take some of excess gap in the U-tab. Does anyone have a recommenda
tion on what works best to deal with this issue?
-
Robert N. Eli
CH701
ist" target=_blank rel=nofollow>http://www.matronics.com/Navigator?Zeni
th701801-List
=nofollow>http://forums.matronics.com
blank rel=nofollow>http://www.matronics.com/contribution
href="http://www.matronics.com/Navigator?Zenith701801-List">http://www.ma
tronics.com/Navigator?Zenith701801-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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