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robert.eli(at)comcast.net
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 Posted: Tue Jan 11, 2011 5:04 am Post subject: Predrilling the short strut end 5/16 bolt holes - CH701 |
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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
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John Bolding
Joined: 23 May 2006
Posts: 281
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| Posted: Tue Jan 11, 2011 5:38 am Post subject: Predrilling the short strut end 5/16 bolt holes - CH701 |
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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
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Tue Jan 11, 2011 6:10 am Post subject: Predrilling the short strut end 5/16 bolt holes - CH701 |
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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(at)comcast.net> wrote:
| Quote: |
From: Robert N. Eli <robert.eli(at)comcast.net>
Subject: Predrilling the short strut end 5/16 bolt holes - CH701
To: Zenith701801-list(at)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
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robert.eli(at)comcast.net
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| Posted: Tue Jan 11, 2011 11:57 am Post subject: Predrilling the short strut end 5/16 bolt holes - CH701 |
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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
[quote] ---
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Tue Jan 11, 2011 12:54 pm Post subject: Predrilling the short strut end 5/16 bolt holes - CH701 |
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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 fix your problem, you paid for a properly built part, Zenith should provide it. It's been my experience that they are great to deal with so I am sure they will help you out.
Doug MacDonald
Do Not Archive
--- On Tue, 1/11/11, Robert N. Eli <robert.eli(at)comcast.net> wrote:
[quote]
From: Robert N. Eli <robert.eli(at)comcast.net>
Subject: Re: Predrilling the short strut end 5/16 bolt holes - CH701
To: zenith701801-list(at)matronics.com
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 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
[quote] ---
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