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Rick.Beckman(at)atk.com
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 Posted: Wed Feb 20, 2008 8:47 am Post subject: XL WING BOLTS and any bolts. |
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As long as the bolt isn't turned while tightening the nut, a washer
isn't really needed under the bolt head, just under the nut. You need
a washer under a bolt head when tightening a bolt into a threaded hole.
It is a bit simpler to use the same size bolt for all twelve locations
though, especially when you're practically standing on your head in
the cabin and working by feel. I put the bolts in from the back of the
spar with the nuts exposed on the front side for ease of inspection. I
had to drill a couple of access holes through the seat pan to allow
the bolts to be inserted that way.
Brian, it's your bird and you can do it however you wish as long as you feel it is safe. My Tech Counselor, Jim Miller, Tony Bengalis award winner, told me the bolts go "In, Back, and Down".
Also, the washer under the bolt head will spread the force over a slightly larger area and, should the bolt turn any, the washer will keep the hex corners from digging into the softer aluminum.
Again, just my $.02.
Rick
Do not archive.
[quote][b]
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Wed Feb 20, 2008 12:05 pm Post subject: XL WING BOLTS and any bolts. |
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The "in, back and down" rule of thumb is based on the idea that if it's applied, the forces acting on the bolt will tend to keep it in place even if the nut falls off. It is not a hard and fast rule though, just a guideline. If there's no particular reason not to, it should be applied. In some cases, this rule can't be applied (for instance, if it doesn't allow a torque wrench to be applied to the nut) and in others, there is a good reason not to apply it. In the case of the spar bolts, I would rather be able to physically inspect the nuts before flight even if it does violate this guideline. It's also pretty difficult to get a torque wrench on the nut if it's under the seat pan.
The hex corners on AN bolts are chamfered so they can't dig into the surface they are mounted to. There is a circular bearing surface built into the bolt head.
On Feb 20, 2008, at 11:44 AM, Beckman, Rick wrote:
| Quote: |
Brian, it's your bird and you can do it however you wish as long as you feel it is safe. My Tech Counselor, Jim Miller, Tony Bengalis award winner, told me the bolts go "In, Back, and Down".
Also, the washer under the bolt head will spread the force over a slightly larger area and, should the bolt turn any, the washer will keep the hex corners from digging into the softer aluminum.
Again, just my $.02.
Rick
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--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
[quote][b]
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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planecrazydld(at)yahoo.co
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| Posted: Wed Feb 20, 2008 7:22 pm Post subject: XL WING BOLTS and any bolts. |
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unless the hole is too close to the radius in the first place...
do not archive
Bryan Martin <bryanmmartin(at)comcast.net> wrote:[quote] The "in, back and down" rule of thumb is based on the idea that if it's applied, the forces acting on the bolt will tend to keep it in place even if the nut falls off. It is not a hard and fast rule though, just a guideline. If there's no particular reason not to, it should be applied. In some cases, this rule can't be applied (for instance, if it doesn't allow a torque wrench to be applied to the nut) and in others, there is a good reason not to apply it. In the case of the spar bolts, I would rather be able to physically inspect the nuts before flight even if it does violate this guideline. It's also pretty difficult to get a torque wrench on the nut if it's under the seat pan.
The hex corners on AN bolts are chamfered so they can't dig into the surface they are mounted to. There is a circular bearing surface built into the bolt head.
On Feb 20, 2008, at 11:44 AM, Beckman, Rick wrote:
| Quote: |
Brian, it's your bird and you can do it however you wish as long as you feel it is safe. My Tech Counselor, Jim Miller, Tony Bengalis award winner, told me the bolts go "In, Back, and Down".
Also, the washer under the bolt head will spread the force over a slightly larger area and, should the bolt turn any, the washer will keep the hex corners from digging into the softer aluminum.
Again, just my $.02.
Rick
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