I am not sure where this came from so I cannot give credit where credit is due but it may be useful to someone.
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Hilok Usage[1].doc [31.5 KiB]
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| NAS 177 Hi-shear rivet & collar http://t18.net/thorpforum/viewtopic.php?f=2&t=6328 |
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| Author: | jsanders [ Sun Oct 10, 2010 4:36 pm ] |
| Post subject: | NAS 177 Hi-shear rivet & collar |
The 601 bulkhead assembly drawing calls out for two NAS 177 rivets that attach 601 bulkhead, 602 fitting and the 601-2 together. what are we substituting for it or were can I get them and the necessary tool. Jon Sanders |
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| Author: | fytrplt [ Mon Oct 11, 2010 6:12 am ] |
| Post subject: | NAS 177 Hi-shear rivet & collar |
Try an NAS517-3-5 flush head machine screw with a washer and an AN364 (thin) nut. These can be found at Aircraft Spruce. Be careful with your rivet planning as it's a pretty tight fit in there. |
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| Author: | Rich Brazell [ Mon Oct 11, 2010 10:56 am ] |
| Post subject: | NAS 177 Hi-shear rivet & collar |
I believe you can also use a Hi-Lok in place of the 177. JT also stated (as quoted from prior posts) that AN hardware could be substituted for Shear Rivets. RB |
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| Author: | stug [ Thu Sep 06, 2012 4:11 pm ] |
| Post subject: | Re: NAS 177 Hi-shear rivet & collar |
Bob can you elaborate on your comment about rivet planning for the 601 above? It does look like a tight fit in that area with opportunity to do something wrong. Thanks Stuart |
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| Author: | fytrplt [ Tue Sep 18, 2012 4:48 pm ] |
| Post subject: | Re: NAS 177 Hi-shear rivet & collar |
Stuart, Really, I was refering to setting and bucking the rivets. |
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| Author: | mattst18 [ Thu Sep 20, 2012 9:00 am ] | ||
| Post subject: | Re: NAS 177 Hi-shear rivet & collar | ||
I am not sure where this came from so I cannot give credit where credit is due but it may be useful to someone.
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| Author: | stug [ Thu Sep 20, 2012 2:36 pm ] |
| Post subject: | Re: NAS 177 Hi-shear rivet & collar |
Matt thanks that document provides some good background on the hi-lock fasteners, I recently was asking my technical advisor what to do about a couple of hi-locks, having never having had any experience with those fasteners this document helps explain a lot more. Bob re the rivet setting in that area. I thought you might be able to offer some more advice about the best sequence to follow when bucking the rivets that area. Having not started in that area yet would I be correct to assume the best sequence would be to rivet the 601 and 602 together then rivet to the side skin start from the tightest corner and work back outwards then finish with the hi-lock/NAS bolt. Also I had another question, if you plan on flush riveting the side skin I presume it would be easier to use universal head rivets for attaching the 601 bulkhead to the side skin, given these rivets are mostly hidden by the wing there would be little value in flush riveting that section. Does that sound right? Regards Stuart |
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| Author: | Bill Williams [ Thu Sep 20, 2012 4:35 pm ] |
| Post subject: | Re: NAS 177 Hi-shear rivet & collar |
JT was an aircraft engineer and had all these rivets and the tooling to install them,hence he used them in the T18. I think you will find that most builders substitute an AN 3 bolt in place of the high shears. |
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| Author: | fytrplt [ Thu Sep 20, 2012 8:28 pm ] |
| Post subject: | Re: NAS 177 Hi-shear rivet & collar |
Stuart, You are correct; it might be easier to rivet the fitting to the 601, then install in the plane. Fit all the pieces with clecos before you rivet anything. This will let you see where the crunch spots will be. Attachment:
File comment: Round head rivets below the wing opening. IMG_0608.JPG [ 396.55 KiB | Viewed 11763 times ] Attachment:
File comment: Hard to see, but the #10 flat head screw is captured a small nut usually found in engine installations. These nuts approximate the size of the Hi-Shear collar. IMG_0610.JPG [ 403.48 KiB | Viewed 11763 times ] You will note some non-standard doublers. This a rebuild project and I had to add some beef due to some poorly drilled holes by the previous builder. |
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| Author: | stug [ Fri Sep 21, 2012 6:26 am ] |
| Post subject: | Re: NAS 177 Hi-shear rivet & collar |
Thanks Bob. Interesting to see the close up pictures and visualise that area. It was suggested to me by a technical advisor that the standard doublers in that area could be beefed up anyway. |
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