Re: [ATM] Threaded inserts for 1/2" carbon fiber tube?

["Chris Todd" <christopher.todd@gmail.com>]

Curt,

That looks like a pretty good solution, I'll have to consider that.
They're made of case-hardened steel - would it be possible to simply
tap them for 1/4-20 threads?

I also found threaded inserts called "weld nuts" at McMaster-Carr
(e.g., part # 90860A115), but the shaft OD was 3/8".

If the OD of the steel bushings are exactly the same as the ID of the
CF tubes, will there be any room for epoxy?  Should I get steel
bushings that are, say, 3/8" OD instead, leaving 1/64" between the
bushing and the ID of the tube, to give some room for the epoxy?  And
may I assume JB Weld is nominally the same as any two part epoxy resin
(I have some West system epoxy I got to experiment with fiberglass
cloth and styrofoam)?

Thanks again to everyone for suggestions and hints, I appreciate it.

Chris

On 3/18/08, Curt Diggs <mokiman_210@yahoo.com> wrote:
> Check this idea. McMaster-Carr has steel bushing part # 8491A181. 13/32" OD with 1/4" ID. Slip a 1/4-20 socket head cap screw (90128A251 for ex.) into that and secure with it JB Weld. Then secure bushing and bolt ass'y into carbon tube also with JB Weld (I've use it extensively with CF tubes - it's very strong and won't pull out). Make sure the head of the bolt (it will be 3/8" dia.) is to the inside. Voila... ready for assembly.
>
>  Curt Diggs
>
>  >Message: 21
> >Date: Mon, 17 Mar 2008 21:15:08 -0400
> >From: "Chris Todd" <christopher.todd@gmail.com>
> >Subject: Re: [ATM] Threaded inserts for 1/2" carbon fiber tube?
> >To: "ATM List" <atm@atmlist.net>
> >Message-ID:
> ><8cb754430803171815n4e8daf42r9b115ff915d44b72@mail.gmail.com>
> >Content-Type: text/plain; charset=ISO-8859-1
>
> >Don,
>
> >Sorry, you're right.  The walls of the tubing are 3/64" thick, so the
> >I.D. is 13/32".  As for screws, I'm very flexible, I could use 1/4-20,
> >or 10-24, or pretty much anything I can get from bob's knobs.
>
> >Chris
>
>
>
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