[PSUBS-MAILIST] eRe: Alan's new motor

Thu Oct 4 15:49:45 EDT 2018

Thanks Hank,
I like your method for making the bushing. It doesn't warrant a bearing
& as I said the ceramic bearings are expensive. 
I was a bit confused about the oil trap but kept quiet :)
Alan

> On 5/10/2018, at 12:40 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> I just realized I misunderstood what your goal is, my idea of a oil trap will not help keep the oil in the motor.    The joints in my arm are plastic bushings made from PVC.  I use a hole saw to make a round plastic disk 1\2 in thick, then I machine a shoulder in the disk that fits tight into the arm member.  The disk has a centre hole drilled for the centre pin.  Seems to work real nice and is quick to make.
> Hank
> 
> On Wednesday, October 3, 2018, 7:13:05 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> the oil tube is clear, so I'll monitor the oil level in the tube & see if
> additional over pressure helps first. Also I have a temperature sensor
> in the motor so if the motor runs cool enough I won't worry.
> Did you put bearings in the joints of your manipulator, or not bother?
> I am still running with the idea of a manipulator with an open gearbox
> & underwater motor. I can get ceramic bearings but they are expensive.
> Alan 
> 
>> On 4/10/2018, at 12:23 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan, all you need is to interrupt the oil pathway, just take a larger container \pipe\ whatever and have the lower tube enter at the bottom of the vessel and have the exiting tube leave on the opposite side above it.  I use this method as a water  trap for my steam engine, under pressure.
>> Hank
>> 
>> On Wednesday, October 3, 2018, 3:39:28 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hank,
>> I have the wires running out of the motor through the tube that the
>> oil comes in through. At a point in that line I have a T where the wires
>> are epoxied & run without the tubing to the through hull, and the tubing
>> continues on to the oil compensator. The compensator has a low oil
>> level switch, so there should always be oil in the line.
>> There is increasing ambient pressure going in to the housing as you 
>> dive, so not sure how you would relieve that on ascent with some sort
>> of oil trap! But I am not sure what idea you have.
>> I am stuck on an Island for 3 weeks looking after a dog & cat then my
>> other daughter is flying in & stealing my car, so won't be
>> making any rapid progress on this :(. 
>> Alan
>> 
>> 
>> 
>>> On 4/10/2018, at 9:29 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> Alan,
>>> You can make a oil trap in the compensation tube, its real simple.
>>> Hank
>>> 
>>> On Wednesday, October 3, 2018, 12:32:59 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> 
>>> Hank,
>>> I am hoping I can dial up the over pressure to the point that it
>>> keeps the oil down. (like blowing in to a straw forcing the liquid out)
>>> The oil goes in through a clear tube so I can monitor the level.
>>> I am not confident though; however oil compensation has been
>>> around for a long time. 
>>> Unfortunately I can't put a one way valve in the system as the 
>>> pressure won't be able to escape on ascent.
>>> Below is the motor in oil without the proppeller.
>>> Alan
>>> <image1.JPG>
>>> 
>>>> On 4/10/2018, at 1:34 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> 
>>>> Alan,
>>>> I have had similar situation, the oil will still come up the tube.  The over pressure makes no difference, unless there is a piston or diaphragm blocking the oil.
>>>> Hank
>>>> 
>>>> On Wednesday, October 3, 2018, 2:53:29 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> 
>>>> 
>>>> Hank,
>>>> yes very patient "lol" as this might not be the final version.
>>>> I have tested the motor out of the housing in a bucket of oil & established
>>>> that it could only be run at 30 Amps without overheating. It causes quite 
>>>> a turbulence running in oil with no prop on due to the open design of a rotating 
>>>> back section. It will want to force oil out of the housing & up the oil feed tube,
>>>> but I am hoping the overpressure from my oil compensator will keep the oil
>>>> in around the motor. 
>>>> Am learning a lot on each attempt.
>>>> Alan
>>>> 
>>>> 
>>>> 
>>>>> On 3/10/2018, at 9:06 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>>> 
>>>>> Alan, your patience is amazing.  I would be itching to test it before sending it away for anodizing.  
>>>>> Hank
>>>>> _______________________________________________
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>>>> 
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