[PSUBS-MAILIST] Electric manipulator (Hank)

[Alan via Personal_Submersibles]

Hank,
came across a post from Phil I had photo copied about his design
for a cheap electric manipulator.
There is no movement of the air pistons when they are not in use – that is, there is no air in the pistons once you exhaust the pressurization air back into the one atmosphere cabin. The pistons are then dead-headed until you energize them again. Note that this simple little system is designed to be used while the sub is on the bottom. I have used it up off bottom but it gets pretty busy maintaining position by VBT or upthrust and operating the manip valves at the same time. If you really want to go ultracheap on an electric manip, buy a reversible dc electric drill, stick it in a thin walled tube, fill it with oil, set it on slow and use the rotation to operate a rack and pinion system which gives you a lineal movement like a piston (run the rotary shaft through a camera case style o ring gland or an imperial tubing fitting or a swagelock style compression fitting with an oring or teflon ring substitiuting for the compression olive or the metal compression ring)– rack and pinion all stay out side in the water. We built several of these to use with a small ROV and it worked OK – (also used two drill motors for propulsion on the ROV!) Phil


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