[PSUBS-MAILIST] Gamma ring machining

Sat Mar 7 19:08:00 EST 2015

Hugh,
I just built one, started testing it but needs to be more ridged unless I mount a grinder on it instead of a cutter.
Hank--------------------------------------------
On Sat, 3/7/15, Hugh Fulton 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: Saturday, March 7, 2015, 6:45 PM

 Try googling Portable Flange
 facer.  You can probably find a local place to rent
 from.Alternatively you can make one
 using a heavy trailer axle hub mounted to a plate with two
 jacking nuts for each of 5 holding points then an arm with a
 pneumatic (air) grinder and a cup wheel.Maybe we need to do an open
 source design for p-subs for an easy to build one as this
 has come up before.Hugh    From: Personal_Submersibles
 [mailto:personal_submersibles-bounces at psubs.org] On
 Behalf Of Alec Smyth via Personal_Submersibles
 Sent: Sunday, 8 March 2015 11:32 a.m.
 To: Personal Submersibles General Discussion
 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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