[PSUBS-MAILIST] Manipulators

[brian]

Thanks Jon,   can't wait to try out a proto type.  Seems like even if a drill was mechanically reversed the polarity would still change the motor direction.  They've come a long way with these cordless drills, some of them have tremendous torque for a cordless.  I would need to turn my front flaps about 90 degrees total ( 45 up and 45 down).  I'm trying to keep the profile down so I don't have protrusions that will cause turbulence or catch seaweed.   
     Also if I run a pair of , say 14 gage wire to the front of my sub ( a distance of about 15 feet) what is the preferred method of running outside wire?  Is there off the shelf underwater wire now ?   I remember the oil filled method with vinyl tubing but I assume there may be a newer method.
Brian
-----Original Message-----
From: "Jon Wallace" <jonw at psubs.org>
Sent 2/7/2014 4:46:02 AM
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] ManipulatorsBrian, any cheap Black & Decker cordless screwdriver is reversible by
polarity and fit nicely into 1.5 inch PVC pipe.  See attached photos...a
few years ago I fabricated an "ROV" motor with a 3.6v B&D model 9078.
They are easy to take apart to get the "guts" out.  I sealed the chuck
shaft with a home-made blue globe using some copper pipe and o-rings,
then used epoxy to permanently attach a SS threaded rod into the chuck
so I could screw on the propeller.  At the time I was thinking the PVC
would suffice as a 1-ATM housing but it would definitely be better oil
compensated.
It looks to me like all the cheap cordless screwdrivers are manufactured
at one location and branded accordingly.  The B&D's seem to be a bit
higher priced probably due to name recognition.  EBAY carries these
things from other manufacturers at very inexpensive pricing ($15 US range).
Jon
On 2/6/2014 6:21 PM, brian wrote:
>  I had a similar idea for my front "aileron" flaps.  I was planning on
> embedding a cordless drill ( high torque) , sealing it and filling
> with mineral oil.  It seems like the ones I looked at were all
> mechanically reversible , where they use a gear to reverse.  Although
> I can't be sure because I haven't taken any of them apart yet.  Phil,
> do you know of a particular brand that is reversible by polarity?
>
> Brian Cox
>
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