[PSUBS-MAILIST] MBT vent tube

[Rick Patton via Personal_Submersibles]

Hey David
I am building a K-350 so this is the vent tube from the MBT's that wrap the
con and come up to the exhaust valves.
I thought about copper Brian but I would of had to go threw the same
process with the sand as it would still be thin walled and am trying to
keep everything looking the same on the boat.
Rick

On Fri, Apr 17, 2020 at 8:57 PM Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Copper?
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] MBT vent tube
> Date: Fri, 17 Apr 2020 18:32:37 -1000
>
> 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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>
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