[PSUBS-MAILIST] Gamma ring machining

Alan James via Personal_Submersibles personal_submersibles at psubs.org
Sat Mar 7 20:32:56 EST 2015


Thanks Alec,The lapping that I saw was by an artist who was joining two peicesof marble. It was done by machine & I think he left it going over night.Alan
      From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, March 8, 2015 11:32 AM
 Subject: Re: [PSUBS-MAILIST] Gamma ring machining
   
I used to do lapping many, many years ago when I built some plastic injection molds. We lapped on a glass plate because it's smoother than plate steel. You change the glass every so often because as abrades it loses its flatness. There's no trouble knowing if the piece you're lapping is done or if its flat. What happens is that, as you work it, you can see the difference in the surface finish. The new finish gradually spreads across the surface, and when its uniform you know you've got rid of any low points. I really can't imagine lapping something as big as we're talking about here, although I suppose its technically possible. This was really hard work, taking days on end to do a piece that was maybe 6" by 10", tiny compared to what we're talking about here. 
Greg Cottrell told me he finished his hatch land surface with an angle grinder, using a flap wheel and a lot of patience. It looks like it had been machined.

Best,
Alec
On Sat, Mar 7, 2015 at 2:09 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



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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