[PSUBS-MAILIST] MK101 oil compensation tap

Thu May 21 15:25:31 EDT 2015

 Rick, I am not a machinist as well.  I have a friend who is and owns his own machine shop.  I outsourced all the machined parts to him.  I don't remember the total cost but there was some setup and learning curve on the first of these.  I asked him what he thought  it would cost to machine future versions ;hub(1), stand offs(3), kort nozzle(1) and adapter(1) for Subconn electrical penetrator).  He thought he could do the 6 parts for $1500 each.   This is still a bit pricey but better than OTS thrusters.  The problem with this kind of stuff is there is not enough volume to drive a lot of cost out by going to castings.
Cliff

       From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, May 21, 2015 12:34 PM
 Subject: Re: [PSUBS-MAILIST] MK101 oil compensation tap

Thanks Cliff,I was very impressed on how well you documented the process as it sure helps us all.Did you machine the SS part that screws into the lower end of the 101 yourself or did you have a machine shop do it?  If you outsourced it, do you remember how pricey it was? I like the the concept but don't have the capability of doing it myself unfortunately.Rick
On Thu, May 21, 2015 at 3:26 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Rick, I updated the MK101 thruster project at the Psub.org web site to show the assembled thrusters installed on the boat http://www.psubs.org/projects/1237684922/mk-101thruster/ . The next time I pull the thrusters off, I will add a picture of the fully assembled thruster alone.  I have not added oil yet.  This is a dry fit only.  I am leaning towards doing what Alec did with his idea to add the SS set screw to the apex of the caps for fillings and to remove air.  This is a great idea.
Cliff

      From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, May 20, 2015 9:56 PM
 Subject: Re: [PSUBS-MAILIST] MK101 oil compensation tap

Any pictures Cliff?Rick
On Wed, May 20, 2015 at 1:07 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Small Tygon flexible tube filled with oil.  No holes in housing.  On the SS part that screws into the side of the housing, I have a 1/4" tubing with Swagelok compression fitting.  I will connect to this port.
Cliff

Cliff Redus
Redus Engineering
USA mobile:  830-931-1280
cliffordredus at sbcglobal.com 
      From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, May 20, 2015 4:17 PM
 Subject: Re: [PSUBS-MAILIST] MK101 oil compensation tap

Cliff,how are you compensating for oil expansion due to heat with the KISS method.Are you just drilling holes in the housing & using tube?Alan

   From: Clifford Redus via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, May 21, 2015 8:43 AM
 Subject: Re: [PSUBS-MAILIST] MK101 oil compensation tap

Actually in the spirit of KISS, I am going to start out using oil pressure compensation.  If I run into any issues, I will look at using the air or this hybrid of oil and air with a regulator.  

Cliff Redus

On May 20, 2015, at 2:30 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Jon,the alternative is to follow Hugh's idea that Cliff is using & I am going to test out,& put a regulator in the system that is set it to around 4psi internal overpressure. This means you can fill with oil & not worry about getting everylast drop going in, or drilling the housing. You will also be able to run it air compensated. There is the safety feature that if you leak oil there is plenty of air to replace it.Cliff already has the parts sorted, just put your order in:)Alan
      From: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, May 21, 2015 5:47 AM
 Subject: Re: [PSUBS-MAILIST] MK101 oil compensation tap

How important is it to get every last air bubble out?  Surely a fraction 
of the total volume is not going to result in catastrophic failure of 
the motor housing, is it?

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