[PSUBS-MAILIST] Gamma ring machining

Fri Mar 6 18:52:47 EST 2015

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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