[PSUBS-MAILIST] anodising

Fri Feb 3 20:01:31 EST 2017

Brian - are you operating in salt or fresh water?  All of the vehicles I have worked on, for deployment in seawater, used 6061-T6 aluminum components, hard anodized black, and additionally protected with zinc anodes mounted to appropriately prepared (i.e. unanodized) surfaces.

Sean

On February 3, 2017 5:06:50 PM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Alan,  
>
>Now you've got me thinking that I might be able to get away with out
>anodizing my 6061 aluminum.  The data that I've been looking at shows
>good corrosion resistance for the 6061.  Hmm... I guess I could just
>try it out and see what happens !  Worst that could happen is I might
>have to replace the parts down the line.  
>
> 
>
>Brian
>
>--- personal_submersibles at psubs.org wrote:
>
>From: Alan James via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] anodising
>Date: Fri, 3 Feb 2017 23:07:54 +0000 (UTC)
>
>I am looking at free machining aluminium rod as one of the options for
>my light housing.
>
>It is sold as 2011 T3 to T6. Is this suitable for hard anodizing?
>
>It is no good for welding.
>
>Alan
>
>_____________________________________________
>From: Hugh Fulton via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: 'Personal Submersibles General Discussion'
><personal_submersibles at psubs.org> 
>Sent: Saturday, February 4, 2017 10:51 AM
>Subject: Re: [PSUBS-MAILIST] scrubber performance
>
>
>Brian,
>
>While Emile has a good anodiser there are many lousy ones out there. 
>Generally anodising will add thickness.  Half goes into the metal and
>half goes on the outside.  Depending on the clearance or fit of your
>threads depends whether you have a problem  We anodise but have to
>allow for clearance..  The Anodisers I have available are very
>commercial and we have had issues affecting O’ring sealing so pick your
>anodiser carefully.  On a class 3 thread fit you cannot get complacent
>as 50 microns thickness is still 0.002” so a thread will have a much
>greater effect  While 50 microns is only 25 microns increase it means
>100 microns on clearance diameter if both male and female are
>anodised..  There are some new processes which claim will not add
>thickness such as diamondysing but that process is added ontop of
>normal anodising.  I would ask Emile what actual process his anodiser
>uses.  We would need to go to an aircraft certified anodiser.   We do
>our own hard anodising.  Pulse anodising will produce better results. 
>Hugh 
>
> 
>
>From: Personal_Submersibles
>[mailto:personal_submersibles-bounces at psubs.org] On Behalf Of emile via
>Personal_Submersibles
>Sent: Saturday, 4 February 2017 7:26 AM
>To: 'Personal Submersibles General Discussion'
>Subject: Re: [PSUBS-MAILIST] scrubber performance
>
> 
>
>Brian, 
>
> 
>
>A good Anodizer can keep it the same size . With 30-50 Micron 
>thickness there can be some Microns “growth” 
>
>Not a issue for O-rings and threads.
>
>My anodize offers a Teflon dip after anodizing to make it more water
>repellant.
>
> 
>
>Emile
>
> 
>
>Van: Personal_Submersibles
>[mailto:personal_submersibles-bounces at psubs.org] Namens Brian Cox via
>Personal_Submersibles
>Verzonden: vrijdag 3 februari 2017 18:05
>Aan: Personal Submersibles General Discussion
>Onderwerp: Re: [PSUBS-MAILIST] scrubber performance
>
> 
>
>Cliff,                 Will I have to worry about threads or o ring
>tolerances after the process?   
>
> 
>
>Brian 
>
>--- personal_submersibles at psubs.org wrote:
>
>From: Cliff Redus via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] scrubber performance
>Date: Fri, 3 Feb 2017 10:45:26 -0600
>
>Brian, I am not a corrosion expert but have found that hard anozizing
>(Mil-A-8625 type III) seems to work fine for my parts.  My experience
>is that PSUB stuff gets banged around a lot so addeded thinckness and
>hardness that comes from Mil-A-8625 type III seems to work out better. 
>Most of my marine experience has been in fresh water lakes so we really
>need to get someone with a lot of saltwater experience to chime in. 
>Also most psubbers don't leave their boats in the water all the time
>and rinse off the boat after use.  This also tends to mitigate
>corrosion.
>
> 
>
>Cliff
>
> 
>
>On Fri, Feb 3, 2017 at 9:50 AM, Brian Cox via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Cliff,   Is the Mil-A-8625 type III class 2 black  anodizing sufficient
>for exposure to sea water?  Using 6061 aluminum. 
>
> 
>
>Brian
>
>
>
>--- personal_submersibles at psubs.org wrote:
>
>From: Cliff Redus via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] scrubber performance
>Date: Fri, 3 Feb 2017 09:30:18 -0600
>
>Sounds like you are having fun coming up to speed on PLCs. Get your
>wife to take the video of your hand waving.  We would all appreciate
>the entailment value!  It a lot of fun to bench test components being
>operated by PLC and see them come to life based on your code.  As to
>compass heading, roll, pitch and yaw sensor, I use the Ocean-server
>http://www.ocean-server.com/compass.html   OS5000-S Solid State tilt
>compensagted 3 axes digital compass,  This is a RS-232 serial device.
>You have to write some PLC ladder logic code to parse the ASCII string
>sent to the PLC to extract the data,  I packaged mine in a small 1-atm
>aluminum anadoized pod about the size of a tennis ball that I have
>mounted outside the steel pressure hull behind the pilot.  Even though
>the DoMore CPU you are using has several serial input ports that could
>be used for this sensor, I ended up getted a dedicated coprocessor
>module that plugs into one of the AutomationDirect PLC bases that
>enables me to write the parsing code in BASIC and enables me to
>dedicate the coprocessor to this sensor.  It took me a while to come up
>to speed on RS-232 comuncations but I now have this working petty much
>bullet proof.  The coprocedssor then sends the heading, pitch, roll and
>yaw values to the PLC cpu to be used any way you want them.  Currently,
>I am only using this data on my HMI.
>
>Cliff
>
> 
>
>On Fri, Feb 3, 2017 at 12:52 AM, David Colombo via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>Hi Cliff,
>
>Its been slow going as I am finishing building my home. Should be
>finished in 45 days. But I have been making progress as I learn PLC
>coding and ladder logic in the evenings. Currently I am working thru
>the flight Joy Stick switch controls combined with a 4 position
>joystick base to control the (2) forward canard wings, (2) vertical
>thrusters  (2) horizontal thrusters, and (2) vectored rear thrusters to
>have a flight experience. I spend many hours in the evening when my
>wife is not looking waving my hands thru the air simulating flight and
>then coding the switches needed to make the maneuver. I'm sure it would
>be entertaining to record a video.  I am curious, are you using any
>gyroscopic sensors for pitch and roll? I'm thinking I need to have some
>build into the coding so as to limit my human abilities as safety
>overrides. 
>
>The next step is to get a bench setup with the joystick and canard
>wings to run tests on the coding and for flight training purposes. Just
>need to finish the house first. Mean while I'll be waving my hands in
>the air for a while.
>
> 
>
>Best Regards,
>David Colombo
> 
>804 College Ave
>Santa Rosa, CA. 95404
>(707) 536-1424
>www.SeaQuestor.com
>
> 
>
>On Thu, Feb 2, 2017 at 8:04 PM, Cliff Redus via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>David, hope that you have made some progress on the design work for
>SeaQuester. When I first installed life support on the R300, I had
>sensors distributed all over the boat.  What I have move to is
>packaging all the Life Support related sensors in a single electrical
>box I call the AMOC module.  AMOC is an acronym for Air Management and
>Oxygen Control. This made it easier to maintain the system and made it
>easy to bench test. I feed HP O2 from an external tank to this box.  It
>in turn breaks the pressure and emits the O2 to keep the mole percent
>balanced.  The PLC interfaces with the AMOC unit to monitor and control
>the air in the cabin. If you are interested, send me your email address
>to cliffordredus at sbcglobal.net and I will send you the DCI for the
>drawings associated with the AMOC  unit and the drawings.  The axial
>flow scrubber I use is the same one Alec used for Snoopy.  It has
>worked great. The PLC ladder logic code around the life support system
>is pretty straight forward.  What I like about the system is that it
>automatically compensates for different sized humans in the boat but
>yet retains a manual mode in the event both the main and auxiliary
>power are lost.  The assembly drawing for the AMOC unit details all the
>sensors as well as all the Swagelok fittings and circular disconnect. 
>This unit should work well with the AutomationDirect DoMore CPU you
>have.
>
> 
>
>Cliff
>
> 
>
> 
>
>On Thu, Feb 2, 2017 at 7:50 PM, David Colombo via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Cliff, Thanks for answering the question I was just going to ask.  Did
>you build any special case to mount for replacement? I need to back and
>see the line of code you used so I can use it in my DoMore PLC
>
> 
>
>Best Regards,
>David Colombo
> 
>804 College Ave
>Santa Rosa, CA. 95404
>(707) 536-1424
>www.SeaQuestor.com
>
> 
>
>On Thu, Feb 2, 2017 at 2:46 PM, via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>I have had good performance from this company but with their K30
>sensor.  $85 and does give 0-5v analog output signal.  It span is
>0-10,000 ppm (0-2%).
>
> 
>
>Cliff
>
>Sent from my iPad
>
>
>On Feb 2, 2017, at 2:37 PM, River Dolfi via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>I did side-by-side tests on several low-cost ambient CO2 sensors when I
>was doing air quality instrumentation work, and I eventually settled on
>these units from COZIR. 
>http://www.co2meter.com/products/cozir-0-2-co2-sensor
>
>They're only about $70US, have built in self calibration, super
>reliable, and have very low current draw compared to other sensors. The
>big rub is that it isn't analog output, but serial.
>
>You would have to interface it with a microcontroller (which is an easy
>enough job with a $20 Arduino) and have it set up to display to an LCD,
>trip an alarm at critical levels, possible demand control of the
>scrubber, other sensors, etc.
>
>I have an identical system built for the health department currently
>running 70 (70!!!) of these sensors and others on battery power across
>the city in the elements. They are that good.
>
> 
>
>I recently found about half of a medical scrubber in a dumpster, so
>I've been thinking about life support lately.
>
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