[PSUBS-MAILIST] Minn Kota 101 - thread spec

Mon Jul 21 08:56:28 EDT 2014

I have a version with a 1/4 pipe nipple in the cone and that seems to work well, I orient the motor so the hole is at the highest point to fill..  I have two areas in Gamma that are oil compensated.  One is the electric valve bank for the manipulator.   I changed the set up on the valve bank to a rubber primer bulb from an outboard motor.  That is very similar to what it had and super easy to fill etc.  On my magnetic coupler arrangement, I have an oil reservoir for the shaft bearings.  This area has a brand new idea purely for the fun of it.  I have mounted a left over air cylinder to the shaft tube in the vertical position and the piston can move freely to compensate.  It is a good area to play around with because there is no harm done if it fails.  
When ever I have a fitting protruding into a cavity like you mentioned, I cut a slot in the side of the fitting to let the air escape.  Similar to what Alec does, instead of cutting it short. 
Hank 

On Monday, July 21, 2014 8:34:57 AM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi James,

I agree it can be a bit of a pain getting the last bit of air out. What I do is cut off the inside of the plastic pipe nipple so it barely protrudes inside the can. Also, I've got an idea for the next version... its using a little bellows bottle instead of the wrap-around, which would have a lot more volume flexibility. My problem is how best to connect the bottle to the motor, I'm still playing around and haven't come up with a specific arrangement. Suggestions are welcome!   

http://www.brownells.com/gunsmith-tools-supplies/shop-accessories-supplies/liquid-squeeze-bottles/bellows-style-oiler-3-pak-sku084000164-20419-44730.aspx  

That said, I've used the existing method for years and years without incident, and the last dive was to 220 feet with no leakage whatsoever in any of the three motors. I think over-pressuring would be fine if the shaft seals could take pressure in either direction, but these have lip seals so it would be tend to blow them out. 

Best,

Alec

On Mon, Jul 21, 2014 at 5:17 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi Cliff,,
>Others may disagree with this, but ive got a suggestion.  If your oil compensating the motors and are going to add the wrap around tube\bladder as per Alecs Snoopy, I would suggest, adding a vent hole somewhere near the aft bearing.  With my setup, ive put the tube going around the motor and its all ok.  But, I just cannot get the last dregs of air out.  No matter what I do.  I suspect that its because the pipe nipple protrudes a mm or so into the casing and so will not allow the last bit of air out.  It really irritates me and I worry that the motor is not properly compensated.  So, I am going to make a modification to the motor like this pic.  I think this will work, the suspect bit is mating the plug against the slightly domed motor case.  I think a large rubber washer should seal it.   The i should be able to rotate the motor and remove the last dregs of air.  What do you think?
>Thanks
>James
>
>
> 
>
>
>
>On 19 July 2014 01:38, Clifford Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>Thanks
>>
>>
>>
>>Cliff Redus 
>>
>>On Jul 18, 2014, at 7:26 PM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>> 
>>Hi Cliff,
>>>
>>>
>>>It is a parallel thread, 1 1/8" - 18.
>>>
>>>
>>>Best,
>>>
>>>
>>>Alec
>>>
>>>
>>>
>>>On Fri, Jul 18, 2014 at 8:04 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>> Does anyone have any documentation on the Minn Kota 101 main support female thread spec?  It does not look like a tapered pipe thread and the threads per inch look to great. I put a digital caliper on this at it read 1.064-1.07 inches for the minor diameter.  I measured the threads and it is 18 threads per inch.    I looked in the machine handbook and the closest that comes is a 1-1/8  UNEF (Extra fine thread series).  The major and minor diameters for a 1-1/8" UNEF are 1.1250" and 1.0649"  respectively. 
>>>>
>>>>
>>>>Can anyone confirm this?
>>>>
>>>>
>>>>Cliff
>>>> 
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> 
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