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notsew_evets(at)frontiern
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 Posted: Fri Jan 04, 2008 3:07 pm Post subject: Main Spar bolts and holes |
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I m starting a new thread just so I can keep you all up to date on whats happening.
Zenith is very concerned about my spar hole situation.
Today I receive an email from Zenith saying that they are sending me a set of hole gauges so that we can get an accurate measurement of the holes.
It will probably take a week or so to get it figured out but I will post immediately any findings that come about......
I d feel really stupid if I really didnt have a problem but I think I do.
CFI for 37 years and I ve ALWAYS told students to check for slop in the wings. Move the wing up and down, then back and forth.....there should be no "play".
On my 601 I have all the main spar bolts inserted. Only three nuts on each side are snug. I have a super amount of play in the up and down, Not so much in the forward and back but some. I expect with just the bolts inserted that I should have no play.. The bolts need to be somewhat snug in their holes...
Actually in a main spar bolt setup you really shouldnt need nuts on the bolts. The bolts are in shear and there is no stress on a nut. Nuts just keep the bolt from falling out. A tappered wing spar pin is similar, the pin takes the stress.
Enough rambling.... More as news develops....
Steve W...
[quote][b]
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planecrazydld(at)yahoo.co
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| Posted: Fri Jan 04, 2008 3:49 pm Post subject: Main Spar bolts and holes |
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Hi Steve;
I would be concerned that the hole patterns are not exactly matched. While it is true that bolted joints get a real boost from face to face friction when the bolt is torqued correctly, this is one joint where I don't think you want eventual loosening due to fretting, galling, or other wear related issues.
I would also assume that when you do ream the holes, that you will do one at a time, disassemble and deburr, then reassemble and pin (at the reamer diameter) and repeat until all have been brought out to size and pattern.
MIL-B-6812 is the procurement spec for AN5 bolts. the lastr version before it was cancelled calls for 125,000 psi ultimate tensile strength for the steel bolt. I would suggest if you don't want to go all the way out to AN6 that you call some aircraft fastener companies and see which NAS or NASM bolts they have in the correct grip length that are 1/64th oversize (+0.015625") and 125 KSI. I would not want to go much higher in tensile strength and certainly not much lower.
steve <notsew_evets(at)frontiernet.net> wrote:
[quote] I m starting a new thread just so I can keep you all up to date on whats happening.
Zenith is very concerned about my spar hole situation.
Today I receive an email from Zenith saying that they are sending me a set of hole gauges so that we can get an accurate measurement of the holes.
It will probably take a week or so to get it figured out but I will post immediately any findings that come about......
I d feel really stupid if I really didnt have a problem but I think I do.
CFI for 37 years and I ve ALWAYS told students to check for slop in the wings. Move the wing up and down, then back and forth.....there should be no "play".
On my 601 I have all the main spar bolts inserted. Only three nuts on each side are snug. I have a super amount of play in the up and down, Not so much in the forward and back but some. I expect with just the bolts inserted that I should have no play.. The bolts need to be somewhat snug in their holes...
Actually in a main spar bolt setup you really shouldnt need nuts on the bolts. The bolts are in shear and there is no stress on a nut. Nuts just keep the bolt from falling out. A tappered wing spar pin is similar, the pin takes the stress.
Be a better friend, newshound, and [quote][b]
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