[PSUBS-MAILIST] Gamma ring machining

[Stephen Fordyce via Personal_Submersibles]

Hi guys,
Brian, they were just careful not to take too much off (and used the
grooves as a guide) - plus it wasn't that critical if it wasn't completely
flat as it wasn't the sealing surface.

Hank, I reckon you'll make it work whether it wants to or not:).

Cheers,
Steve
On 07/03/2015 10:19 AM, "hank pronk via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> Steve,
> I am half way done building my flange facing machine,  I should be mostly
> done tomorrow.  My rig already weighs about 700 lbs.  I think it is
> important that it is heavy and mine is built heavier than the ones on
> YouTube.  If it fails I can do as you mention.  I actually did exactly what
> you say on Gamma's window frames. I used paint and glass with fine wet sand
> paper. I would guess the SS ring was much harder than the 516-70 I have.
> Hank
> --------------------------------------------
> On Fri, 3/6/15, Stephen Fordyce via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>  Subject: Re: [PSUBS-MAILIST] Gamma ring machining
>  To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>  Received: Friday, March 6, 2015, 4:06 PM
>
>  Hi Hank,
>
>  We used a flame facing machine recently at work to do a
>  stainless steel flange on a pressure vessel about 800mm ID.
>  We hired it to use ourselves at great expense, and the thing
>  weighed a couple of hundred kilos, was very solid.
>  The fitter who did the job was very experienced
>  machinist (but hadn't used one before) but could not get
>  the finish very smooth - I can't find photos sorry, but
>  it was like regular machining grooves but much larger - and
>  it looked pretty ordinary. He spent several hours with a
>  grinder cleaning it up.
>  On balance, it probably would have been easier
>  to just flatten it manually with a grinder (but it was on a
>  live liquefied natural gas plant and they don't like
>  sparks:) ). Wasn't critical to get a flat face as we
>  were just making room for a gasket in a slot to have more
>  compression.
>  After getting it pretty flat with a straight
>  edge, the fine stuff/quality control could be done by a thin
>  layer of paint on a known flat plate or machined flange
>  which you put on the welded flange and then where there is
>  no paint deposited, you know that area is too low. Obviously
>  paint is no good, but colored oil or 2-layered carbon paper
>  (nice because then you have a trace of it) would probably
>  work, or charcoal.
>  Cheers,
>
>  Steve
>  On 06/03/2015 11:40 PM,
>  "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org>
>  wrote:
>  Brian,
>
>  No, the machine is connected to the inside lip of the
>  ring.  The machine rotates on a center pivot.  The cutter
>  rotates instead of the part.
>
>  Hank
>
>  --------------------------------------------
>
>  On Thu, 3/5/15, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org>
>  wrote:
>
>
>
>   Subject: Re: [PSUBS-MAILIST] Gamma ring machining
>
>   To: "Personal Submersibles General Discussion"
>  <personal_submersibles at psubs.org>
>
>   Received: Thursday, March 5, 2015, 9:15 PM
>
>
>
>   Hank,  are you going to be
>
>   turning the whole fricking sub ?
>
>
>
>   Brian
>
>
>
>   --- personal_submersibles at psubs.org
>
>   wrote:
>
>
>
>   From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
>
>   To: personal_submersibles at psubs.org
>
>   Subject: [PSUBS-MAILIST] Gamma ring machining
>
>   Date: Thu, 5 Mar 2015 18:00:24 -0800
>
>
>
>   Today my welder came to my shop and welded the
>  reinforcing
>
>   ring into Gamma, 10 passes, looks perfect!
>
>
>
>   Next step, machine the ring.  I am going to make a
>
>   flange facing machine from a one ton  truck full
>
>   floater differential hub and a part or two borrowed from
>  my
>
>   spare lathe.  The rig will be hydraulic drive.
>
>   This may or may not work.  :-)  If it works and I
>
>   am confident it will, I can also face CT lands, with the
>  CT
>
>   welded in place.
>
>   Hank
>
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