[PSUBS-MAILIST] Gamma ring machining

[hank pronk via Personal_Submersibles]

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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