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Building Tips and technical articles. => 1/2 A building. => Topic started by: Target on February 17, 2019, 04:49:15 PM
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Gents-
What is everyone using to mount their little I/C demons to their planes?
I measured up the lug holes of a Cox Medallion .049 and the Norvel .061 (much larger).
It seems that at least in the Norvel, a 2-56 machine screw gets lost in the hole (like what I told my ex wife, "It's like throwing a hot dog down a hallway!"), and yet a 3mm or 4-40 is too big for the Norvels.
Looks like a 3-48 would be perfect for either though, but....
Another pretty substantial issue is that blind nuts seem lightly available for 2-56, and completely non-existent for 3-48 or 2.5mm. Blind nut aren't easily available until 4-40 or 3mm. I DID find some blind nuts in MPJet's catalog for 2.5mm, that might be an option....
What are folks using? Anyone have a source for the 3-48 blind nuts??
Thanks in advance!!
R,
Target
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Funny you ask that. While a bit different, I am not having any luck finding six(6) 3-48 cap screws to use in rebuilding an engine. However, I did find 3-48 blind nuts. Du-Bro makes them. One of my LHS has them. But there is no 3-48 machine screws.....
https://webstore.eliminator-rc.com/du-bro-3-48-blind-nuts
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what length 3/48 allens do u need for what engine
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Chancey- AWESOME!!
Wish they were in bulk, but what the heck at least available!!
I have always had the best luck on fasteners (in general) with McMaster Carr….
Have you looked there?
91251A096 is the part number for 1/2" long, they have every length from 1/8" to 1".....
R,
Target
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RTL (https://www.rtlfasteners.com/RC/o.html) and Micro (https://www.microfasteners.com/blind-nuts-t-nuts.html) both have 2-56 T-nuts. I'm not sure which of the two I bought mine from, but I'd trust either of them. I think 2-56 would be plenty strong.
I tried, and a 4-40 would fit through the holes of a Norvel Big Mig 049. It was snug, though -- there'd be no room for messing up the holes in the crutch, and I really don't like the idea of chewing that much wood out of a 1/4" square bearer. I suspect they're designed for 2.5mm -- for which I can't find T-nuts.
I think I'd use 2-56 nuts, and figure out a way of positioning the engine that didn't depend on the screws. Or I'd order up some M2.5 hardware, and just use regular nuts on the back side.
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MPJet has the 2.5mm insert nuts, Tim....
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MPJet has the 2.5mm insert nuts, Tim....
Hmm. Thanks.
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Micro fasteners and RTL both sell 3-48 socket screws in a bunch of lengths. Washers, t nuts and regular and safety nuts the smaller packages are quantities of 50 and they are reasonably priced
Micro fasteners list 3/16, 1/4 3/8 1/2 and 3/4
Go on line and type in the supplier closest to you and you will be able to get almost any size bolt,nut or washer t-nut up to 1/4 and 6mm
additionally they sell 5-40 screws for the Cox engines and 3 mm for the Norvels prop nuts
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Micro fasteners and RTL dont have 3-48 t nuts. If either of them does, PLEASE post the part number, i really want to buy some!
In fact, no place has them that i can find.
The Dubro #134 item mentioned is no longer listed in their catalog, and it appears they assigned that number to a red spinner, lol.
Thats not a good sign, but i did send them an email incase they have some hidden somewhere.
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I hate to say it, but 3-48 T-nuts appear on the 'Bay from time to time. I bought a few bags from a vendor when had several. They will be recycled when the model no longer flies.
Since that is an orphaned size, I find myself using 2-56 in their place during construction. My Mosquito with twin Big Mig .074s uses 2-56 all over...engines, tanks, landing gear straps. I do use a thread locker (blue) on engine hardware and landing gear.
I wish I could buy a bag of 100 3-48!
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Micro fasteners and RTL dont have 3-48 t nuts. If either of them does, PLEASE post the part number, i really want to buy some!
In fact, no place has them that i can find.
The Dubro #134 item mentioned is no longer listed in their catalog, and it appears they assigned that number to a red spinner, lol.
Thats not a good sign, but i did send them an email incase they have some hidden somewhere.
I am wondering if by any chance that the SKU number listed is that of their own, and not a Dubro part number? Just a thought. However, I will not be going there anytime soon that I see, but if I will be in the area, I can check it out and pick some up if interested. I would know a day or two in advance so I could give you a heads up.
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I am wondering if by any chance that the SKU number listed is that of their own, and not a Dubro part number? Just a thought. However, I will not be going there anytime soon that I see, but if I will be in the area, I can check it out and pick some up if interested. I would know a day or two in advance so I could give you a heads up.
If you actually find a source for 3-48 blind nuts, please let me know.
Keith
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I am wondering if by any chance that the SKU number listed is that of their own, and not a Dubro part number? Just a thought. However, I will not be going there anytime soon that I see, but if I will be in the area, I can check it out and pick some up if interested. I would know a day or two in advance so I could give you a heads up.
No, I contacted Dubro, and that IS the correct Dubro part number. But they said that they no longer "make" the 3-48 hardware and have none in stock any longer. That's a dead end.
I did by a couple cards of the Dubro #134 off Ebay in a lot, as Jim mentioned. And your source has (2) cards of the t nuts, but the shipping turned me off from buying them there. You should buy the two they have left if the shipping is reasonable....
R,
Target
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If you actually find a source for 3-48 blind nuts, please let me know.
Keith
Will do.
Vr,
Target