[PSUBS-MAILIST] Gamma ring machining

Sat Mar 7 20:27:42 EST 2015

Sorry Brian,no.Alan
      From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, March 8, 2015 10:10 AM
 Subject: Re: [PSUBS-MAILIST] Gamma ring machining

Hey Alan,                    Do you know any Ham radio guys down there ?  Brian, KK6IRC 73

--- personal_submersibles at psubs.org wrote:

From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Gamma ring machining
Date: Sat, 7 Mar 2015 19:09:51 +0000 (UTC)

Hank,had a quick search but couldn't find any suitable lappingsolution for a home builder. There were referances to thickplate glass with a bonded diamond surface & marble aslapping plates.Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, March 7, 2015 11:29 PM
 Subject: Re: [PSUBS-MAILIST] Gamma ring machining

Alan,
I have been told that it would work, but I am not convinced.  I would think the machined disk needs to be harder so it does not wear down.  Honestly I just don't know.  
Hank--------------------------------------------
On Fri, 3/6/15, Alan James 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, 9:30 PM

 So
 do you think it would work with a flatsheet
 rotating on your reinforcing ring?I
 had thought of doing this with the hatch & landing,
 toget a
 perfect seal, not sure if I would need an orbital
 motionor
 not.Alan

    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>

 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 

 Sent:
 Saturday, March 7, 2015 12:52 PM
  Subject: Re:
 [PSUBS-MAILIST] Gamma ring machining

 Alan,
 Yes I
 have done lapping in the past.  I mostly lap valves in
 engines.  It works great on two tapered faces.  
 Hank--------------------------------------------
 On Fri, 3/6/15, Alan James 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, 6:39 PM

  Hank,are you
  familiar with lapping?Rubbing

 two surfaces together with abrasive paste in
  betweenhttp://en.wikipedia.org/wiki/Lapping
  Haven't
  done it but have
 seen it in operation; you can get a very

 smoothsurface
  with this technique. Not sure
 if you could adapt it to your
  newflange
  facing machine.The
  machine I
 saw in operation was slow but required very little
  attention.Alan

     From: hank pronk
 via
  Personal_Submersibles

 <personal_submersibles at psubs.org>

  To: Personal
  Submersibles General Discussion
  <personal_submersibles at psubs.org>

  Sent:

 Saturday, March 7, 2015 12:18 PM
   Subject:
 Re:
  [PSUBS-MAILIST] Gamma ring machining

 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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