[PSUBS-MAILIST] Gamma ring machining

Sat Mar 7 19:30:03 EST 2015

Hi Hank,

Sounds great and I think it needs a grinding disc.

Is it on your projects page?

Anything like this?

Hugh

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of hank pronk via Personal_Submersibles
Sent: Sunday, 8 March 2015 1:08 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Gamma ring machining

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 <
<mailto:personal_submersibles at psubs.org> personal_submersibles at psubs.org>
wrote:

Subject: Re: [PSUBS-MAILIST] Gamma ring machining

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

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

wrote:

 Subject: Re: [PSUBS-MAILIST] Gamma ring machining

To: "Personal Submersibles General Discussion"

< <mailto:personal_submersibles at psubs.org> 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

< <mailto:personal_submersibles at psubs.org> personal_submersibles at psubs.org>

 To: Personal

Submersibles General Discussion

< <mailto:personal_submersibles at psubs.org> 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 < <mailto:personal_submersibles at psubs.org>
personal_submersibles at psubs.org>

wrote:

   Subject: Re:

[PSUBS-MAILIST] Gamma ring machining

  To:

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

 < <mailto:personal_submersibles at psubs.org> personal_submersibles at psubs.org>

   To: Personal

  Submersibles General Discussion

  < <mailto:personal_submersibles at psubs.org>
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 < <mailto:personal_submersibles at psubs.org>
personal_submersibles at psubs.org>

  wrote:

Subject: Re:

  [PSUBS-MAILIST] Gamma ring

machining

  To:

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

  wrote:

 Subject: Re:

  [PSUBS-MAILIST] Gamma ring

machining

    To:

"Personal Submersibles General

 Discussion"

  < <mailto:personal_submersibles at psubs.org>
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

    ---  <mailto:personal_submersibles at psubs.org>
personal_submersibles at psubs.org

    wrote:

    From:

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

    To:  <mailto:personal_submersibles at psubs.org>
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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