[PSUBS-MAILIST] Manipulators

[Jon Wallace]

Brian, 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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