[PSUBS-MAILIST] MBT vent tube

[Rick Patton via Personal_Submersibles]

I had the flat bar and steel table to tack it to and this way I would be
able to use a rose bud to hot bend and wouldn't of been able to of done
that with a wood template or jig. Also I like to use heat when I can as it
retains it's shape and with cold bending, you always get some spring back
so the jig needs to be smaller to allow for that. On the down side, I may
have to pickle it to prevent future hazing after buffing since I messed
with the molecules.
Rick

On Fri, Apr 17, 2020 at 3:00 PM Sean T. Stevenson via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> The other way I have seen this done is to fabricate a custom round end
> mandrel out of wood where the round is cut with a router on a circle jig,
> and then the correct radius matching the tube OD is cut into the
> cylindrical face of the mandrel using the router with a bull nose bit.
> Essentially building a tube bender but with large bend radius.
>
> Sean
>
> -------- Original Message --------
> On Apr. 17, 2020, 18:49, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Well I fabricated a jig on my fab table using 3/16” X 1 1/2” flat bar,
> packed the 1” SS tube with sand, welded ends on it, said a few prayers and
> went for it. I first tried cold bending it but needed a much stronger jig
> for that so I pulled out my rose bud and hot bent it and it worked great!
> Now I have a lot of buffing to do to make it look pretty again.
> Rick
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