Maybe John can share the design at some point here? Sounds good.
Cheers,
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Terry McCreary
Sent: Tuesday, 31 August 2021 1:07 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: JB Weld Usability
At TRATECH last month John DeMar showed a design for a reloadable solid
motor that was compatible with Aerotech 38 mm reload(s) but did not require
machining snap rings nor threads (well, except for tapping for some set
screws). The aft thrust ring was JBWelded to the casing as it would not get
hot enough to debond.
Best -- Terry
_____
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> > on
behalf of Troy Prideaux <troy@xxxxxxxxxxxxxxxxxxxxx
<mailto:troy@xxxxxxxxxxxxxxxxxxxxx> >
Sent: Sunday, August 29, 2021 7:01 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
<arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx> >
Subject: [AR] Re: JB Weld Usability
Should say ". which shouldn't really matter ."
High temp JB weld is good adhesive - it will bond to things that more
regular epoxy won't (eg: PVC plastic) but it's also quite brittle once fully
cured - which should really matter much for closure retention relying on the
shear strength & adhesion of any adhesive used, although watch out for
potential diameter increases from strain if the closure is directly bonded
to the inside of the tubing wall, although if also using franken-bolt
retention in combination, that should mitigate that issue substantially.
Troy
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx] On Behalf Of Jack Hanna
Sent: Sunday, 29 August 2021 4:02 AM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] JB Weld Usability
Hello!
I've been working on a hybrid engine recently and picked up some JB weld for
cheap, and have been wondering if it's a semi-practical bulkhead adhesive
that can keep pressure. I'm planning on having two o ring grooves on either
side of bolt holes to have a hopefully overkill secure piece, however I'm
wondering especially with the hose threads if I could JB-weld it together to
effectively get one piece. Has anyone here used it and if so what are some
of its limitations or things to note when using. Thanks! Also, it says "5020
PSI" on the packaging, i'm assuming that's the best case scenario and
wondering what practical pressures it can handle in terms of leakage.
