[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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