Author Topic: Using nut instead of a threaded insert (3pc takedown)  (Read 3025 times)

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Offline arachnid

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Using nut instead of a threaded insert (3pc takedown)
« on: April 24, 2017, 01:28:05 pm »

Hi guys.
Just a little question- Is it possible to use a hex nut or a tee nut instead of a threaded insert in a 3pc TD? Meaning, to glue in the nut inside a countersink hole in the riser (on the belly side) and attach the limb with a bolt?
Am I missing something here? Any design flaw? (assuming I use 1 bolt and a pin)

mikekeswick

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #1 on: April 24, 2017, 01:40:55 pm »
The problem is that a t-nut or standard nut put into a recess isn't going to be inherently stable, the threaded section isn't long enough and you are unlikely to be able to get them plumb square. You would also have to add another lam to cover them on the belly side.
A well drilled hole, plumb square to the riser 'face' is key. If you get the hole perfect then tap it  and epoxy in a threaded insert you won't have any problems.

Offline arachnid

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #2 on: April 24, 2017, 02:48:52 pm »
I have the holes already drilled perfectly. My problem  that I don't have an insert. That's why I'm trying  find replacements.

Offline PatM

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #3 on: April 24, 2017, 03:10:58 pm »
Marc made a take-down with toilet bowl mounting hardware.

Offline DC

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #4 on: April 24, 2017, 04:33:15 pm »
There is a thing called a Heli-Coil used for repairing stripped threads. It may work for this and it should be available everywhere. Do a search and see what you think. I've never used them so you're on your own. :D

Offline PatM

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #5 on: April 24, 2017, 05:57:58 pm »
Can you just look a bit harder for an insert? Many people say they can't find something where they live and then google shows that they live next to a supplier.

Offline DC

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #6 on: April 24, 2017, 09:26:29 pm »
Home Depot has them, although they didn't look like real nice ones.

Offline bubby

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #7 on: April 25, 2017, 12:15:59 am »
Actually i have used the tee nuts on a 3 pc td and they worked great
failure is an option, everyone fails, it's how you handle it that matters.
The few the proud the 27🏹

Offline bubby

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #8 on: April 25, 2017, 12:19:43 am »
[This one here has tee nutsURL=http://s623.photobucket.com/user/bubncheryl/media/100_2795.jpg.html][/URL]
failure is an option, everyone fails, it's how you handle it that matters.
The few the proud the 27🏹

Offline arachnid

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #9 on: April 25, 2017, 03:18:33 am »
Bubby, I member is . How's it holding up?
I see you  2 nuts, would it work with only one?
Can you give some details about how to install it?

Offline Ed Brooks

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #10 on: April 25, 2017, 11:09:28 am »
They do make a longer than normal nut.
We used these in the past. not sure if they may work for you or not. the part# is 37815 from fastenal.com
It's in my blood...

Centralia WA,

Offline bubby

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #11 on: April 25, 2017, 02:31:15 pm »
If you are going to use the tee nuts i think you should use 2. My riser was a 3 pc and i installed the tee nuts between layers before glueup. I drilled the hole the size of the bolt and where the nut installed went the size of the nut and i also countersunk the thickness of the flange so everything fit well. As far as i know it is holding up fine but i don't own it anymore
failure is an option, everyone fails, it's how you handle it that matters.
The few the proud the 27🏹

Offline arachnid

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #12 on: April 26, 2017, 10:36:04 am »
 Why use 2 and not 1?
What am I missing here? Isn't the nut strong enough?

Offline PatM

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #13 on: April 26, 2017, 10:45:50 am »
Insurance. You need to know the shear strength of the bolts relative to the forces being applied before you can start eliminating things.

Offline bubby

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Re: Using nut instead of a threaded insert (3pc takedown)
« Reply #14 on: April 26, 2017, 11:48:54 am »
I used grade 8 bolts so plenty strong, why 2 bolts? You asked my opinion and thats it, i like the feeling of a little added reasurance, redundancy in safety is ok in my book, heck just buy the insert kit from bingham, its not very expensive then u can use one bolt and a locator pin.
failure is an option, everyone fails, it's how you handle it that matters.
The few the proud the 27🏹